Handmade radio

Abstract

The utility model discloses a handmade radio, which comprises a shell formed by splicing a front panel, a back plate, a top plate and arc-shaped side plates, a circuit board fixedly arranged in the shell, and an antenna, a loudspeaker and a battery box which are respectively and fixedly arranged in the shell and electrically connected with the circuit board, a radio circuit, a power amplifier circuit and a power supply circuit are arranged on the circuit board, the antenna is electrically connected with the radio circuit, the loudspeaker is electrically connected with the power amplifier circuit, and the battery box is electrically connected with the power supply circuit. The radio teaching aid is simple in structure, reasonable in design and convenient to assemble, students can better understand and learn the principle and the structure of the radio while exercising the operational ability through assembling the radio teaching aid by themselves, the structure and the principle of the radio can be more visually understood, and the learning efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of science and education, is scientific experimental equipment, not a toy, and specifically relates to a handmade radio. Background Art

[0002] Radio, also known as radio or broadcasting, is a small radio receiver that uses electrical energy to convert radio wave signals and can listen to audio signals transmitted by radio stations. It is mainly composed of mechanical devices, electronic devices, magnets, etc., and is used to receive radio station broadcasts and listen to radio transmitters.

[0003] Today's students cannot intuitively understand the structure and working principle of the radio through books and video materials in daily classes. The existing finished radios are compact and not easy to disassemble, making it difficult for students to intuitively learn and understand the various components of the radio. Utility Model Content

[0004] The main purpose of the utility model is to provide a handmade radio. Students can assemble a simple radio by themselves, which can deepen their understanding of various parts of the radio and have a more intuitive understanding of the structure and principle of the radio.

[0005] In order to solve the above technical problems, the present invention provides a handmade radio, comprising:

[0006] The shell is composed of a front panel, a back panel, a top panel and curved side panels;

[0007] a circuit board fixedly disposed within the housing, the circuit board being provided with a radio circuit for frequency selection, signal processing, and conversion of received broadcast radio wave signals into audio signals, a power amplifier circuit for amplifying the audio signals, and a power supply circuit electrically connected to the radio circuit and the power amplifier circuit, respectively;

[0008] An antenna, an external speaker and a battery box are respectively fixedly arranged in the shell and electrically connected to the circuit board. The antenna is electrically connected to the radio circuit, the external speaker is electrically connected to the power amplifier circuit, and the battery box is electrically connected to the power supply circuit.

[0009] Furthermore, the radio circuit includes:

[0010] A radio IC chip U2, a resistor R1, a capacitor C2, and a capacitor C4; the power amplifier circuit is electrically connected to pins 12 and 13 of the radio IC chip U2, respectively; a first end of the resistor R1 is electrically connected to a power supply circuit, and a second end is electrically connected to one pin of the radio IC chip U2 and a first end of the capacitor C2; a second end of the capacitor C2 is grounded; a first end of the capacitor C4 is electrically connected to pin 10 of the radio IC chip U2 and the power supply circuit, and a second end is grounded; pin 10 of the radio IC chip U2 is electrically connected to the power supply circuit; pins 2, 3, 5, 11, and 14 of the radio IC chip U2 are grounded, respectively;

[0011] A frequency selection circuit electrically connected to the four pins of the radio IC chip U2;

[0012] An oscillator chip X1 whose first end is electrically connected to pin nine of the radio IC chip U2 and whose second end is grounded;

[0013] Touch switches SW1 and SW2 for channel adjustment are electrically connected to pins 7 and 8 of the radio IC chip U2, respectively, and the second ends of SW1 and SW2 are grounded;

[0014] The touch switches SW3 and SW4 for volume adjustment are electrically connected to the 15th and 16th pins of the radio IC chip U2 respectively, and the second ends of SW3 and SW4 are grounded respectively.

[0015] Furthermore, the frequency selection circuit includes an inductor L1, a capacitor C3 and a capacitor C11. The first end of the inductor L is electrically connected to the four pins of the radio IC chip U2, the first end of the capacitor C3 and the first end of the capacitor C11 respectively. The second end of the capacitor C3 is grounded, and the second end of the capacitor C11 is electrically connected to the antenna.

[0016] Furthermore, the power amplifier circuit includes a power amplifier chip U1, a capacitor C1, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R2, a resistor R6, a resistor R7, a resistor R8, a light emitting diode LED2 and a pin socket CN1;

[0017] One pin of the power amplifier chip U1 is electrically connected to the first end of the capacitor C8 and is grounded, and the second end of the capacitor C8 is electrically connected to the second and third pins of the power amplifier chip U1 respectively;

[0018] The four pins of the power amplifier chip U1 are electrically connected to the first ends of resistors R2, R6, and R8, respectively. The second end of resistor R6 is electrically connected to the first end of capacitor C1. The second end of capacitor C1 is electrically connected to pin 13 of the radio IC chip U2. The second end of resistor R8 is electrically connected to the first end of capacitor C9. The second end of capacitor C9 is electrically connected to pin 12 of the radio IC chip U2.

[0019] The five pins of the power amplifier chip U1 are electrically connected to the second end of the resistor R2, the first end of the resistor R7, and the second pin of the pin header CN1, respectively. The second end of the resistor R7 is electrically connected to the first end of the light-emitting diode LED2, and the second end of the light-emitting diode LED2 is grounded.

[0020] The six pins of the power amplifier chip U1 are electrically connected to the first end of the capacitor C10 and the power supply circuit respectively, and the second end of the capacitor C10 is electrically connected to the seventh pin of the power amplifier chip U1 and is grounded;

[0021] The eighth pin of the power amplifier chip U1 is electrically connected to one pin of the pin header CN1;

[0022] The pin socket CN1 is electrically connected to the external speaker.

[0023] Furthermore, the power supply circuit includes a power supply, a needle seat CN2, a toggle switch SW5, a resettable fuse F1, a resistor R4, a resistor R9, an electrolytic capacitor E1 and a light-emitting diode LED1;

[0024] The power supply is a battery box equipped with dry cells, the positive electrode of which is electrically connected to one pin of the needle holder CN2 and the three pins of the toggle switch SW5, respectively; the two pins of the needle holder CN2 are electrically connected to the negative electrode of the power supply and are grounded; the three pins of the needle holder CN2 are electrically connected to the first end of the resistor R1; and the four pins of the needle holder CN2 are electrically connected to the first end of the capacitor C4;

[0025] One and two pins of the toggle switch SW5 are electrically connected to the first end of the resettable fuse F1, respectively. The second end of the resettable fuse F1 is electrically connected to the first end of the resistor R4, the first end of the resistor R9, the first end of the electrolytic capacitor E1, the first end of the capacitor C10, and the six pins of the power amplifier chip U1, respectively. The second end of the resistor R4 is electrically connected to the first end of the light-emitting diode LED1, the second end of the light-emitting diode LED1 is grounded, the second end of the resistor R9 is electrically connected to the six pins of the radio IC chip U2, and the second end of the electrolytic capacitor E1 is grounded.

[0026] Furthermore, the model of the radio IC chip U2 is RDA5807, the model of the power amplifier chip U1 is 8002B, and the specification of the oscillator chip X1 is 32.768KHz.

[0027] Furthermore, the front panel and the back panel are both round mooncake shapes.

[0028] Furthermore, a bottom plate parallel to the top plate is fixedly provided in the shell, and the front and rear ends of the bottom plate are respectively clamped on the front panel and the back plate, and a mounting plate for fixing the circuit board, antenna and battery box is fixedly provided between the top plate and the bottom plate, and the circuit board and battery box are fixedly installed on the front side of the mounting plate one above and one below, and the bottom end of the antenna is fixedly installed at a bottom corner on the back side of the mounting plate, and the top end extends vertically upward to the outside of the shell.

[0029] Furthermore, the touch switches SW1, SW2, SW3, SW4, the light-emitting diode LED1 and the toggle switch SW5 are arranged in sequence from left to right on the side of the circuit board close to the top plate and extend through the top plate to the outside of the shell. The top plate is provided with through holes corresponding to the antenna, the touch switches SW1, SW2, SW3, SW4, the light-emitting diode LED1 and the toggle switch SW5.

[0030] Furthermore, the external speaker is fixedly mounted on the inner side of the front panel, and a sound outlet hole corresponding to the external speaker is provided at the center of the front panel.

[0031] Furthermore, the curved side panels are formed by piecing together a plurality of flexible splicing panels, and protrusions for clamping with the front panel and the back panel are respectively provided on both sides of the end of a single flexible splicing panel, and a plurality of pairs of grooves opening toward both sides of the flexible splicing panel and symmetrically arranged are evenly provided in the length direction of the single flexible splicing panel, and through grooves are respectively provided between two adjacent pairs of grooves and in the middle of the flexible splicing panel.

[0032] Furthermore, the width of each of the plurality of flexible splicing plates is W, in mm, the length of each of the strip grooves is L1, in mm, the length of each of the strip through slots is L2, in mm, and the distance between two adjacent strip grooves is D, in mm, which satisfies:

[0033] and and

[0034] Furthermore, there are three flexible splicing plates, the head end of the first flexible splicing plate conflicts with the left end of the top plate, and the tail end conflicts with the head end of the second flexible splicing plate, the tail end of the second flexible splicing plate conflicts with the head end of the third flexible splicing plate, and the tail end of the third flexible splicing plate conflicts with the right end of the top plate.

[0035] Compared with the prior art, the advantages of the present invention are:

[0036] The utility model has a simple structure, a reasonable design and is easy to assemble. Students can assemble the radio by themselves, and at the same time, their hands-on ability can be exercised, and the students can better understand and learn the principle and structure of the radio, have a more intuitive understanding of the structure and principle of the radio, and improve their learning efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0038] Figure 1 This is a schematic diagram of the three-dimensional structure of the utility model.

[0039] Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention after removing the front panel 11.

[0040] Figure 3 This is a schematic diagram of the three-dimensional structure of the present invention from another angle after removing the back plate 12.

[0041] Figure 4 is a schematic structural diagram of the top plate 13,

[0042] Figure 5 is a schematic structural diagram of a single flexible splicing plate 100 when it is not bent.

[0043] Figure 6 for Figure 5 A top view of

[0044] Figure 7 is a schematic structural diagram of a single flexible splicing plate 100 when bent in an arc shape.

[0045] Figure 8 This is the circuit diagram of the radio circuit.

[0046] Figure 9 This is the circuit diagram of the power amplifier circuit.

[0047] Figure 10 The circuit diagram of the power supply circuit is shown below.

[0048] The reference numerals are as follows:

[0049] Shell 1, front panel 11, back panel 12, top panel 13, curved side panel 14, flexible splicing plate 100, protrusion 101, strip groove 102, strip through slot 103, circuit board 2, antenna 3, external speaker 4, battery box 5, bottom plate 6, mounting plate 7. DETAILED DESCRIPTION

[0050] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail below with reference to the accompanying drawings. The description in this part is only exemplary and explanatory and should not have any limiting effect on the scope of protection of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0052] It should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is typically placed when in use. These terms are intended solely to facilitate and simplify the description of the utility model and are not intended to indicate or imply that the device or component referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the utility model. Furthermore, the terms "first," "second," and "third," etc., are used solely for distinction and description and should not be construed as indicating or implying relative importance.

[0053] Furthermore, terms such as "horizontal," "vertical," and "overhanging" do not necessarily imply that a component must be absolutely horizontal or overhanging, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but rather that it can be slightly tilted.

[0054] It should also be noted that, in the description of this utility model, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections; direct connections, indirect connections through an intermediate medium, and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0055] Please refer to Figures 1 to 10 The present invention provides a handmade radio, comprising a housing 1, a circuit board 2, an antenna 3, an external speaker 4 and a battery box 5, wherein:

[0056] The housing 1 is composed of a front panel 11, a back panel 12, a top panel 13 and arc-shaped side panels 14. Figure 1 、 Figure 2 and Figure 3The splicing form adopts the invention patent No. 2022100472115 applied by the applicant in 2022 - a splicing form in a plate splicing structure and its application. The front panel 11, the back panel 12, and the top panel 13 are provided with a plurality of snap-in holes and screw holes. The utility model will not be described in detail. For the uniqueness and beauty of the appearance, the front panel 11 and the back panel 12 are both round moon cake shaped;

[0057] like Figure 2 The circuit board 2 is fixedly arranged in the housing 1. The circuit board 2 is provided with a radio circuit for selecting the frequency of the received broadcast wave signal, processing the signal and converting it into an audio signal, a power amplifier circuit for amplifying the audio signal, and a power supply circuit electrically connected to the radio circuit and the power amplifier circuit respectively;

[0058] The antenna 3, the external speaker 4 and the battery box 5 are fixedly arranged in the housing 1 and electrically connected to the circuit board 2. Figure 2 and Figure 3 The antenna 3 is electrically connected to the radio circuit, the external speaker 4 is electrically connected to the power amplifier circuit, and the battery box 5 is electrically connected to the power supply circuit. Specifically,

[0059] The radio circuit includes a radio IC chip U2, a resistor R1, a capacitor C2, a capacitor C4, a frequency selection circuit, an oscillation chip X1 and touch switches SW1, SW2, SW3 and SW4. Figure 8 The radio IC chip U2 is RDA5807. The first end of the resistor R1 is electrically connected to the power supply circuit, and the second end is electrically connected to one pin of the radio IC chip U2 and the first end of the capacitor C2. The second end of the capacitor C2 is grounded. The first end of the capacitor C4 is electrically connected to pin 10 of the radio IC chip U2 and the power supply circuit, and the second end is grounded. Pin 10 of the radio IC chip U2 is electrically connected to the power supply circuit, and pins 2, 3, 5, 11, and 14 of the radio IC chip U2 are grounded respectively.

[0060] The frequency selection circuit is electrically connected to the four pins of the radio IC chip U2. The frequency selection circuit includes an inductor L1, a capacitor C3 and a capacitor C11. Figure 8 The first end of the inductor L is electrically connected to the four pins of the radio IC chip U2, the first end of the capacitor C3, and the first end of the capacitor C11, respectively. The second end of the capacitor C3 is grounded, and the second end of the capacitor C11 is electrically connected to the antenna 3.

[0061] The specification of the oscillator chip X1 is 32.768KHz. The first terminal of the oscillator chip X1 is electrically connected to the ninth pin of the radio IC chip U2, and the second terminal is grounded.

[0062] The touch switches SW1 and SW2 are used for channel adjustment. The first ends of the touch switches SW1 and SW2 are electrically connected to pins 7 and 8 of the radio IC chip U2, respectively, and the second ends are grounded.

[0063] The touch switches SW3 and SW4 are used for volume adjustment. The first ends of the touch switches SW3 and SW4 are electrically connected to the 15th and 16th pins of the radio IC chip U2 respectively, and the second ends are grounded respectively.

[0064] The received radio signal is frequency-selected by the frequency selection circuit and then transmitted to the radio IC chip U2 for signal amplification and sound signal demodulation to form an audio signal. The demodulated audio signal is transmitted to the power amplifier circuit for amplification.

[0065] The power amplifier circuit is electrically connected to pins 12 and 13 of the radio IC chip U2. Specifically, the power amplifier circuit includes the power amplifier chip U1, capacitor C1, capacitor C8, capacitor C9, capacitor C10, resistor R2, resistor R6, resistor R7, resistor R8, light emitting diode LED2 and pin socket CN1. Figure 9 ;

[0066] The model of the power amplifier chip U1 is 8002B. One pin of the power amplifier chip U1 is electrically connected to the first end of the capacitor C8 and is grounded. The second end of the capacitor C8 is electrically connected to the second and third pins of the power amplifier chip U1 respectively.

[0067] The four pins of the power amplifier chip U1 are electrically connected to the first ends of resistors R2, R6, and R8, respectively. The second end of resistor R6 is electrically connected to the first end of capacitor C1. The second end of capacitor C1 is electrically connected to pin 13 of the radio IC chip U2. The second end of resistor R8 is electrically connected to the first end of capacitor C9. The second end of capacitor C9 is electrically connected to pin 12 of the radio IC chip U2.

[0068] The five pins of the power amplifier chip U1 are electrically connected to the second end of the resistor R2, the first end of the resistor R7, and the second pin of the pin header CN1, respectively. The second end of the resistor R7 is electrically connected to the first end of the light-emitting diode LED2, and the second end of the light-emitting diode LED2 is grounded.

[0069] The six pins of the power amplifier chip U1 are electrically connected to the first end of the capacitor C10 and the power supply circuit respectively, and the second end of the capacitor C10 is electrically connected to the seventh pin of the power amplifier chip U1 and is grounded;

[0070] The eighth pin of the power amplifier chip U1 is electrically connected to one pin of the pin header CN1;

[0071] The pin socket CN1 is electrically connected to the external speaker 4. After the audio signal is frequency-selected, signal-processed and converted by the radio circuit, it is amplified by the power amplifier chip U1 and then the speaker connected to the terminal CN1 emits the broadcast sound.

[0072] The power supply circuit includes a power supply, a needle seat CN2, a toggle switch SW5, a resettable fuse F1, a resistor R4, a resistor R9, an electrolytic capacitor E1 and a light-emitting diode LED1. Figure 10 ;

[0073] The power source is a battery box 5 containing dry cell batteries, the positive electrode of which is electrically connected to one pin of the needle holder CN2 and the third pin of the toggle switch SW5, respectively. The second pin of the needle holder CN2 is electrically connected to the negative electrode of the power source and to ground. The third pin of the needle holder CN2 is electrically connected to the first end of the resistor R1, and the fourth pin of the needle holder CN2 is electrically connected to the first end of the capacitor C4.

[0074] Pins 1 and 2 of the toggle switch SW5 are electrically connected to the first end of the resettable fuse F1, respectively. The second end of the resettable fuse F1 is electrically connected to the first end of the resistor R4, the first end of the resistor R9, the first end of the electrolytic capacitor E1, the first end of the capacitor C10, and the sixth pin of the power amplifier chip U1, respectively. The second end of the resistor R4 is electrically connected to the first end of the light-emitting diode LED1, the second end of the light-emitting diode LED1 is grounded, the second end of the resistor R9 is electrically connected to the sixth pin of the radio IC chip U2, and the second end of the electrolytic capacitor E1 is grounded.

[0075] It should be noted that the antenna 3 , the external speaker 4 and the battery box 5 are all connected to the corresponding connection ports on the circuit board 2 using wires.

[0076] Structurally, the present invention also has the following preferred configurations:

[0077] A bottom plate 6 parallel to the top plate 13 is fixed in the housing 1, and the front and rear ends of the bottom plate 6 are respectively connected to the front panel 11 and the back panel 12. Figure 2 and Figure 3 A mounting plate 7 for fixing the circuit board 2, antenna 3 and battery box 5 is fixed between the top plate 13 and the bottom plate 6. The circuit board 2 and the battery box 5 are fixedly mounted on the front of the mounting plate 7, one above and one below. The bottom end of the antenna 3 is fixedly mounted at a bottom corner on the back of the mounting plate 7, and the top end extends vertically upward to the outside of the shell 1.

[0078] In order to facilitate the operation and observation of the power-on status of the radio, the touch switches SW1, SW2, SW3, SW4, the light-emitting diode LED1 and the toggle switch SW5 are arranged from left to right on the side of the circuit board 2 close to the top plate 13 and extend through the top plate 13 to the outside of the housing 1. This makes it easy to adjust the sound by operating the touch switches SW1 and SW2, adjust the channel by operating the touch switches SW3 and SW4, and understand the power-on status by observing the status of the light-emitting diode LED1. The top plate 13 is provided with through holes corresponding to the antenna 3, the touch switches SW1, SW2, SW3, SW4, the light-emitting diode LED1 and the toggle switch SW5, as shown in FIG. Figure 4 .

[0079] The external speaker 4 is fixedly mounted on the inner side of the front panel 11. The center of the front panel 11 is provided with a sound outlet corresponding to the external speaker 4. Figure 1 and Figure 3 .

[0080] The arc-shaped side panels 14 of the present invention are preferably spliced ​​panels with a certain degree of flexibility. More preferably, the arc-shaped side panels 14 are formed by splicing together a plurality of flexible spliced ​​panels 100. Figure 2 and Figure 3 Specifically, there are 3 flexible splicing plates 100. The head end of the first flexible splicing plate 100 conflicts with the left end of the top plate 13, and the tail end conflicts with the head end of the second flexible splicing plate 100. The tail end of the second flexible splicing plate 100 conflicts with the head end of the third flexible splicing plate 100, and the tail end of the third flexible splicing plate 100 conflicts with the right end of the top plate 13.

[0081] The ends of a single flexible splicing plate 100 are respectively provided with protrusions 101 for engaging with the front panel 11 and the back panel 12, and corresponding card holes are respectively provided on the front panel 11 and the back panel 12. A single flexible splicing plate 100 is evenly provided with a plurality of pairs of strip grooves 102 that are open on both sides of the flexible splicing plate 100 and symmetrically arranged. A strip through groove 103 is respectively provided between two adjacent pairs of strip grooves 102 and in the middle of the flexible splicing plate 100. Figure 5 、 Figure 6 and Figure 7 .

[0082] In order to make the flexible splicing plate 100 have flexibility and sufficient strength to ensure the stability of splicing, there are certain requirements for the size of the flexible splicing plate 100, such as Figure 6 The width of a single flexible splicing plate 100 is W, in mm. The length of a single strip groove 102 is L1, in mm. The length of a single strip through groove 103 is L2, in mm. The distance between two adjacent strip grooves 102 is D, in mm. These satisfy: and and When not assembled, the plurality of flexible splicing panels 100 can be stacked together with the front panel 11, the back panel 12, the top panel 13, the bottom panel 6 and the mounting panel 7. At this time, the state of a single flexible splicing panel 100 is as follows: Figure 5 As shown, when the arc-shaped side panels 14 are assembled, they are bent and assembled according to a predetermined arc. At this time, the state of the single flexible splicing panel 100 is as follows. Figure 7 shown.

[0083] Working principle:

[0084] The present invention belongs to the field of science and education, and is a student-made science and education product. When the product leaves the factory, it includes a complete set of front panel 11, back panel 12, top panel 13, multiple flexible splicing boards 100, finished circuit board 2 (with wires), antenna 3, external speaker 4 (with wires), battery box 5 (with wires), bottom plate 6, mounting plate 7, several screws, 2 dry batteries, and a screwdriver. The following steps are performed for manual assembly:

[0085] 1) Know the parts;

[0086] 2) Use screws to fix the external speaker 4 to the inner side of the front panel 11 according to the screw holes reserved on the front panel 11;

[0087] 3) Use screws to secure the circuit board 2 and battery box 5 to the front of the mounting plate 7 using the screws provided in the screw holes. Connect the wires from the battery box 5 to the power port on the circuit board 2. Secure the antenna 3 to the bottom corner of the back of the mounting plate 7 and connect the wires from the circuit board 2 to the bottom end of the antenna 3.

[0088] 4) Assemble the mounting plate 7 with the circuit board 2 and battery box 5 fixed on the top plate 13. Then assemble the bottom plate 6 with the front panel 11 and the mounting plate 7 to secure the mounting plate 7. Note that when assembling the mounting plate 7, the antenna 3, the touch switches SW1, SW2, SW3, SW4, the light-emitting diode LED1, and the toggle switch SW5 must be aligned with the through holes of the top plate 13 one by one.

[0089] 5) Assemble the front panel 11 with the top panel 13 and bottom panel 6, and connect the wires of the external speaker 4 to the speaker port on the circuit board 2. Then, assemble multiple flexible splicing boards 100 on the inside of the front panel 11 to form curved side panels 14, which surround the mounting plate 7 and bottom panel 6. Finally, assemble the back panel 12 to complete the radio.

[0090] 6) Install the battery and turn on the toggle switch SW5 to test.

[0091] The assembled radio of the present invention selects the frequency of the received radio signal by the frequency selection circuit, transmits it to the radio IC chip U2 for signal amplification and sound signal demodulation to form an audio signal, transmits the demodulated audio signal to the power amplifier circuit for amplification, and finally emits the broadcast sound through the speaker connected to the terminal CN1.

[0092] The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and the specific implementation of the present invention cannot be considered to be limited to these descriptions. For those skilled in the art of the present invention, without departing from the concept of the present invention, several simple deductions or substitutions can be made, which should be considered to fall within the scope of protection of the present invention.

Claims

1. Handmade radio, characterized by, include: A housing (1), wherein the housing (1) is formed by splicing a front panel (11), a back panel (12), a top panel (13) and curved side panels (14); A circuit board (2) fixedly arranged in the housing (1), the circuit board (2) being provided with a radio circuit for frequency selection, signal processing and conversion of received broadcast wave signals into audio signals, a power amplifier circuit for amplifying the audio signals, and a power supply circuit electrically connected to the radio circuit and the power amplifier circuit respectively; An antenna (3), an external speaker (4), and a battery box (5) are respectively fixedly arranged in the housing (1) and electrically connected to the circuit board (2); the antenna (3) is electrically connected to the radio circuit, the external speaker (4) is electrically connected to the power amplifier circuit, and the battery box (5) is electrically connected to the power supply circuit.

2. The handmade radio according to claim 1, characterized in that The radio circuit comprises: A radio IC chip U2, a resistor R1, a capacitor C2, and a capacitor C4; the power amplifier circuit is electrically connected to pins 12 and 13 of the radio IC chip U2, respectively; a first end of the resistor R1 is electrically connected to a power supply circuit, and a second end is electrically connected to one pin of the radio IC chip U2 and a first end of the capacitor C2; a second end of the capacitor C2 is grounded; a first end of the capacitor C4 is electrically connected to pin 10 of the radio IC chip U2 and the power supply circuit, and a second end is grounded; pin 10 of the radio IC chip U2 is electrically connected to the power supply circuit; pins 2, 3, 5, 11, and 14 of the radio IC chip U2 are grounded, respectively; A frequency selection circuit electrically connected to the four pins of the radio IC chip U2; An oscillator chip X1 whose first end is electrically connected to pin nine of the radio IC chip U2 and whose second end is grounded; Touch switches SW1 and SW2 for channel adjustment are electrically connected to pins 7 and 8 of the radio IC chip U2, respectively, and the second ends of SW1 and SW2 are grounded; The touch switches SW3 and SW4 for volume adjustment are electrically connected to the 15th and 16th pins of the radio IC chip U2 respectively, and the second ends of SW3 and SW4 are grounded respectively.

3. The handmade radio according to claim 2, characterized in that The frequency selection circuit includes an inductor L1, a capacitor C3 and a capacitor C11. The first end of the inductor L is electrically connected to the four pins of the radio IC chip U2, the first end of the capacitor C3 and the first end of the capacitor C11 respectively. The second end of the capacitor C3 is grounded, and the second end of the capacitor C11 is electrically connected to the antenna (3).

4. The handmade radio according to claim 3, characterized in that The power amplifier circuit includes a power amplifier chip U1, a capacitor C1, a capacitor C8, a capacitor C9, a capacitor C10, a resistor R2, a resistor R6, a resistor R7, a resistor R8, a light emitting diode LED2 and a needle seat CN1; One pin of the power amplifier chip U1 is electrically connected to the first end of the capacitor C8 and is grounded, and the second end of the capacitor C8 is electrically connected to the second and third pins of the power amplifier chip U1 respectively; The four pins of the power amplifier chip U1 are electrically connected to the first ends of resistors R2, R6, and R8, respectively. The second end of resistor R6 is electrically connected to the first end of capacitor C1. The second end of capacitor C1 is electrically connected to pin 13 of the radio IC chip U2. The second end of resistor R8 is electrically connected to the first end of capacitor C9. The second end of capacitor C9 is electrically connected to pin 12 of the radio IC chip U2. The five pins of the power amplifier chip U1 are electrically connected to the second end of the resistor R2, the first end of the resistor R7, and the second pin of the pin header CN1, respectively. The second end of the resistor R7 is electrically connected to the first end of the light-emitting diode LED2, and the second end of the light-emitting diode LED2 is grounded. The six pins of the power amplifier chip U1 are electrically connected to the first end of the capacitor C10 and the power supply circuit respectively, and the second end of the capacitor C10 is electrically connected to the seventh pin of the power amplifier chip U1 and is grounded; The eighth pin of the power amplifier chip U1 is electrically connected to one pin of the pin header CN1; The needle seat CN1 is electrically connected to the external speaker (4).

5. The handmade radio according to claim 4, characterized in that The power supply circuit includes a power supply, a needle seat CN2, a toggle switch SW5, a resettable fuse F1, a resistor R4, a resistor R9, an electrolytic capacitor E1 and a light-emitting diode LED1; The power supply is a battery box (5) equipped with dry batteries, the positive electrode of which is electrically connected to one pin of the needle seat CN2 and the three pins of the toggle switch SW5, respectively; the two pins of the needle seat CN2 are electrically connected to the negative electrode of the power supply and are grounded; the three pins of the needle seat CN2 are electrically connected to the first end of the resistor R1; and the four pins of the needle seat CN2 are electrically connected to the first end of the capacitor C4; One and two pins of the toggle switch SW5 are electrically connected to the first end of the resettable fuse F1, respectively. The second end of the resettable fuse F1 is electrically connected to the first end of the resistor R4, the first end of the resistor R9, the first end of the electrolytic capacitor E1, the first end of the capacitor C10, and the six pins of the power amplifier chip U1, respectively. The second end of the resistor R4 is electrically connected to the first end of the light-emitting diode LED1, the second end of the light-emitting diode LED1 is grounded, the second end of the resistor R9 is electrically connected to the six pins of the radio IC chip U2, and the second end of the electrolytic capacitor E1 is grounded.

6. The handmade radio according to claim 5, characterized in that The model of the radio IC chip U2 is RDA5807, the model of the power amplifier chip U1 is 8002B, and the specification of the oscillator chip X1 is 32.768KHz.

7. The handmade radio according to claim 1, characterized in that The front panel (11) and the back panel (12) are both in the shape of round mooncakes.

8. The handmade radio according to claim 5, characterized in that A bottom plate (6) parallel to the top plate (13) is fixedly provided in the shell (1), and the front and rear ends of the bottom plate (6) are respectively clamped on the front panel (11) and the back plate (12), and a mounting plate (7) for fixing and mounting a circuit board (2), an antenna (3) and a battery box (5) is fixedly provided between the top plate (13) and the bottom plate (6), and the circuit board (2) and the battery box (5) are fixedly mounted on the front side of the mounting plate (7) one above and one below, and the bottom end of the antenna (3) is fixedly mounted at a bottom corner on the back side of the mounting plate (7), and the top end extends vertically upward to the outside of the shell (1).

9. The handmade radio according to claim 8, characterized in that The touch switches SW1, SW2, SW3, SW4, the light emitting diode LED1 and the toggle switch SW5 are sequentially arranged from left to right on a side of the circuit board (2) close to the top plate (13) and respectively extend through the top plate (13) to the outside of the housing (1); the top plate (13) is provided with through holes corresponding to the antenna (3), the touch switches SW1, SW2, SW3, SW4, the light emitting diode LED1 and the toggle switch SW5.

10. The handmade radio according to claim 1, characterized in that The external speaker (4) is fixedly mounted on the inner side of the front panel (11), and a sound outlet corresponding to the external speaker (4) is provided at the center of the front panel (11).

11. The handmade radio according to claim 1, characterized in that The arc-shaped side panel (14) is formed by piecing together a plurality of flexible splicing panels (100); protrusions (101) for engaging with the front panel (11) and the back panel (12) are respectively provided on both sides of the end of a single flexible splicing panel (100); a plurality of pairs of strip grooves (102) open toward both sides of the flexible splicing panel (100) and symmetrically arranged are evenly provided in the length direction of the single flexible splicing panel (100); and strip through grooves (103) are respectively provided between two adjacent pairs of strip grooves (102) and in the middle of the flexible splicing panel (100).

12. The handmade radio according to claim 11, characterized in that The width of a single flexible splicing plate (100) is W, in mm, the length of a single strip groove (102) is L1, in mm, the length of a single strip through groove (103) is L2, in mm, and the distance between two adjacent strip grooves (102) is D, in mm, satisfying: and and 13. The handmade radio according to claim 12, characterized in that The number of the flexible splicing plates (100) is 3, the head end of the first flexible splicing plate (100) abuts against the left end of the top plate (13), and the tail end abuts against the head end of the second flexible splicing plate (100), the tail end of the second flexible splicing plate (100) abuts against the head end of the third flexible splicing plate (100), and the tail end of the third flexible splicing plate (100) abuts against the right end of the top plate (13).

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