Multifunctional DI box

Abstract

A multifunctional DI box comprises an input interface, a first selection switch, a first signal attenuation circuit, a second selection switch, a second signal attenuation circuit, an amplification circuit, a power supply circuit, a third selection switch, an output circuit and an output interface. The input interface is used for connecting a musical instrument or an amplifier, selectively accessing or bypassing the first signal attenuation circuit through the first selection switch, connecting the second selection switch, selectively accessing or bypassing the second signal attenuation circuit through the second selection switch, and then connecting the third selection switch; and the output circuit is connected with the output interface and comprises a transformer, the primary side of the transformer is connected with the third selection switch, and the secondary side of the transformer is connected with the output interface. According to the utility model, various input signal types are supported, an input mode and a working mode are selected through a switch, different application scenarios can be adapted, and the same product can be used in multiple different application scenarios.

Description

TECHNICAL FIELD

[0001] The utility model relates to a DI box. BACKGROUND

[0002] ‌The main role of DI box (Direct Injection box) is to convert high impedance, high level unbalanced signal into low impedance, low level balanced signal. This conversion is particularly important in band performance and recording studio, because unbalanced signal is easy to be affected by external electromagnetic interference during transmission, resulting in noise problem. By converting into balanced signal through DI box, the signal is more stable during transmission, which can effectively reduce interference and ensure the clarity of the signal.

[0003] In music live recording work, because the place of extracting sound source for recording is different, DI boxes with different functions are needed to complete this work. For example, when extracting sound source recording from the output interface of a guitar instrument, a DI box with high impedance input is needed. If the sound source signal is extracted from the output interface of the mixing console, an attenuation circuit is needed in the front stage to assist in preventing the recording signal from being distorted. Therefore, the application of the existing single-function DI box is limited. SUMMARY

[0004] The utility model solves the technical problem that the prior art has the above-mentioned insufficient and provides a multifunctional DI box, which can manually switch the working mode according to the type and intensity of the input signal to meet the diversified audio processing demand and can be used in various music places.

[0005] The utility model adopts the technical scheme for solving the above technical problem:

[0006] A multifunctional DI box, comprising an input interface, a first selection switch, a first signal attenuation circuit, a second selection switch, a second signal attenuation circuit, an amplification circuit, a power supply circuit, a third selection switch, an output circuit and an output interface; the input interface is used for connecting different signal sources, selecting access or bypassing the first signal attenuation circuit through the first selection switch, connecting the second selection switch, selecting access or bypassing the second signal attenuation circuit through the second selection switch, connecting the third selection switch, selecting access or bypassing the amplification circuit through the third selection switch, and connecting the output circuit; the output circuit is in communication with the output interface; the output circuit comprises a transformer, the primary of the transformer is connected with the third selection switch, and the secondary of the transformer is connected with the output interface.

[0007] Better, a pass-through socket is further arranged, the grounding end of the pass-through socket is connected with the signal output end of the input socket, so that, in addition to being able to directly connect other audio equipment through the pass-through socket, no signal noise is inputted when the pass-through socket is not used.

[0008] Better still, a grounding circuit and a grounding switch are provided, and the output interface is grounded through the grounding switch, so that the output interface can be grounded through the grounding circuit via the grounding switch or directly grounded.

[0009] More specifically, the grounding circuit comprises a resistor R6 and a capacitor C4, and the resistor R6 and the capacitor C4 are connected in parallel with one end connected to pin 1 of the card and the other end grounded.

[0010] More specifically, the first signal attenuation circuit comprises a resistor R1, a resistor R2 and a resistor R32, and the signal input by the input interface J1 is attenuated by the resistor R1, the resistor R2 and the resistor R32 and then input to the next stage.

[0011] More specifically, the second signal attenuation circuit comprises a resistor R11 and a resistor R21, and the signal from the previous stage is attenuated by the resistor R11 and the resistor R21 and then input to the next stage.

[0012] More specifically, the amplifier circuit comprises an operational amplifier U4, the operational amplifier U4 is coupled to a resistor R26 via a capacitor C14 and then enters the 3-pin of the operational amplifier U4, the output is from the 6-pin of the operational amplifier U4, the 2-pin of the operational amplifier U4 is connected to the 6-pin, a half voltage circuit comprising a capacitor C18, a resistor R35, a resistor R22 and a resistor R34 is connected to the 7-pin to provide a half voltage for the operational amplifier U4, and diodes D5 and D6 are used to protect the operational amplifier U4 by preventing the input signal from exceeding the power voltage of the operational amplifier U4; the power supply circuit comprises a 48V phantom power supply and a transistor Q1, the output card J3 is connected to the 48V phantom power supply, specifically, the 2-pin and the 3-pin of the card J3 have the 48V phantom power supply, the power supply is filtered by a resistor R9, a resistor R10 and a capacitor C8 and then enters the collector of the transistor Q1, a stable 24V voltage is provided for the base of the transistor Q1 by a resistor R8, a capacitor C7 and a diode D14, the voltage is output from the emitter, a power filter circuit comprising a resistor R7 and a capacitor C16 is connected between the emitter and the collector to prevent the transistor from being broken down when the output voltage is much higher than the input voltage.

[0013] More specifically, the operational amplifier is TL061.

[0014] Better still, a power indicator circuit is further provided, which comprises a diode LED15 and a resistor R51, the diode LED15 and the resistor R51 are connected in series and then grounded, the diode LED15 is a power indicator light, and the resistor R51 is a current-limiting resistor for the indicator light.

[0015] More specifically, the output interface is a card interface.

[0016] Compared with the prior art, the multifunctional DI box supports multiple input signal types and strengths, selects input mode and working mode through a switch, for example, when a musical instrument is input, the musical instrument input can be selected through the switch, when an amplifier signal is input, the amplifier input can be selected through the switch, if the input signal pushing force is strong, the passive mode can be used to avoid signal distortion, but if the input signal pushing force is weak, the active mode can be selected to obtain natural and full sound quality, therefore, the multifunctional DI box is simple to operate and can adapt to different application scenarios, and the same product can be used in multiple different application scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a circuit schematic diagram of the multifunctional DI box of the utility model embodiment.

[0018] Figure 2 It is an input circuit schematic diagram of the multifunctional DI box of the utility model embodiment.

[0019] Figure 3 It is an amplification circuit schematic diagram of the multifunctional DI box of the utility model embodiment.

[0020] Figure 4 It is a schematic diagram of the multifunctional DI box of the utility model embodiment.

[0021] Figure 5 It is an output circuit schematic diagram of the multifunctional DI box of the utility model embodiment. DETAILED DESCRIPTION

[0022] The utility model will be described in detail in combination with the drawings and embodiments.

[0023] As Figures 1 to 5 shown, a multifunctional DI box comprises an input interface, a first selection switch, a first signal attenuation circuit, a second selection switch, a second signal attenuation circuit, an amplification circuit, a third selection switch, an output circuit, an output interface, a grounding switch and a grounding circuit.

[0024] The input interface is J1 and is suitable for musical instruments such as electric guitars and basses and amplifiers.

[0025] It also comprises a straight-through interface J2, the straight-through interface J2 is connected with the input interface J1, the grounding end of the straight-through socket is connected with the signal output end of the input socket, and when the straight-through socket is not used, there is no signal noise input.

[0026] When the input interface J1 has no signal input, the switch spring of the input interface J1 is in a closed state, the input point is grounded through the switch spring of the straight-through interface J2, and interference signals are prevented from entering the later stage.

[0027] The first selection switch is S3A, which is a musical instrument / amplifier selection switch, and selects the subsequent circuit according to the input signal type.

[0028] The first signal attenuation circuit comprises resistors R1, R2 and R32, and the signal input by the input interface J1 is input to the next stage after being attenuated by the resistors R1, R2 and R32.

[0029] When the input interface J1 inputs a signal from a musical instrument, the 1 pin and the 2 pin of the switch S3A are connected, and the signal can bypass the resistor R1 to enter the next stage; when the input interface J1 inputs a signal from an amplifier, the switch S3A is in a state of connecting the 2 pin and the 3 pin, and the signal enters the next stage after being attenuated by the first signal attenuation circuit.

[0030] A voltage stabilizing circuit is further arranged, which comprises diodes D1 and D2, and the two ends of the series connection of the diodes D1 and D2 are connected between the input signal input and the ground, for preventing the input signal from damaging the subsequent circuit due to an excessively large amplitude; when the input signal is excessively large, it is limited in a specified range by the diodes D1 and D2.

[0031] The second signal attenuation circuit comprises resistors R11 and R21, and the series connection of the resistors R11 and R21 is connected to the ground.

[0032] When the 1 pin and the 2 pin of the second attenuation switch S3 are connected, and the 4 pin and the 5 pin are connected, the second attenuation switch S3 is in a non-attenuation state, and bypasses the second signal attenuation circuit; when the 5 pin and the 6 pin of the second attenuation switch S3 are connected, and the 2 pin and the 3 pin are connected, the second attenuation switch S3 is in an attenuation state, and the signal is input from the 5 pin, attenuated by the second signal attenuation circuit through the 6 pin, and then output from the 2 pin to the next stage through the 3 pin.

[0033] The amplification circuit comprises an operational amplifier U4, which is TL061 in the embodiment, and is coupled to the resistor R26 through the capacitor C14, and then enters the 3 pin of the operational amplifier U4, and is output from the 6 pin of the operational amplifier U4, and the 2 pin of the operational amplifier U4 is connected to the 6 pin, and the capacitor C18, the resistor R35, the resistor R22 and the resistor R34 form a half voltage circuit connected to the 7 pin, for providing half voltage for the operational amplifier U4.

[0034] A protection voltage is further arranged, which comprises diodes D5 and D6, for preventing the input signal from exceeding the power voltage of the operational amplifier U4, and protecting the operational amplifier U4.

[0035] The third selection switch S5 is an active mode or passive mode switch, when the 2nd pin and the 3rd pin of the third selection switch S5 are connected, and the 5th pin and the 6th pin are connected, it is a passive mode, the signal is input from the 2nd pin, output from the 5th pin through the 3rd pin and the 6th pin without the operational amplifier U4, that is, bypassing the amplification circuit; when the 2nd pin and the 1st pin of the third selection switch S5 are connected, and the 5th pin and the 4th pin are connected, it is an active mode, the signal is input from the 2nd pin, output from the 5th pin through the 1st pin, the capacitor C14, the resistor R26, the 3rd pin of the operational amplifier U4, the 6th pin of the operational amplifier U4, the 4th pin of the third selection switch S5 and the 5th pin of the third selection switch S5.

[0036] The power supply circuit comprises a 48V phantom power supply, a transistor Q1, and an output jack J3 connected to the 48V phantom power supply, specifically, the 2nd pin and the 3rd pin of the jack J3 are connected to the 48V phantom power supply, and the signal is input into the collector of the transistor Q1 through the resistor R9 and the resistor R10 after being filtered by the capacitor C8, the base of the transistor Q1 is provided with a stable 24V voltage by the resistor R8, the capacitor C7 and the diode D14, and the voltage is output from the emitter, and the resistor R7 and the capacitor C16 form a power filter circuit, and the diode D8 is connected between the emitter and the collector.

[0037] The power supply circuit further comprises a power indication circuit, which comprises a diode LED15 and a resistor R51, the diode LED15 and the resistor R51 are connected in series and grounded, the diode LED15 is a power indication lamp, and the resistor R51 is a current-limiting resistor of the indication lamp.

[0038] The output circuit comprises a transformer T1, and the signal from the third selection switch S5 directly or through the amplification circuit is coupled into the primary of the transformer T1 through the capacitor C10 and the capacitor C15, so that the output signal is coupled, and the secondary of the transformer T1 is connected to the phase switch S2, and the phase switch S2 is connected to the output interface.

[0039] When the 4th pin and the 5th pin of the phase switch S2 are connected, and the 1st pin and the 2nd pin are connected, it is a normal phase, and when the 4th pin and the 6th pin of the phase switch S2 are connected, and the 1st pin and the 3rd pin are connected, it is a reverse phase.

[0040] The output interface is a balanced interface, and the embodiment is an XLR (jack) interface, which provides a 48V voltage of the power supply circuit.

[0041] The 2nd pin of the phase switch S2 is connected to the 3rd pin of the output jack, the 5th pin of the phase switch S2 is connected to the 2nd pin of the jack, the 1st pin of the jack is connected to the moving terminal of the grounding switch S4, and the static terminal of the grounding switch S4 is connected to the ground.

[0042] The grounding circuit comprises a resistor R6 and a capacitor C4, which are connected in parallel, one end of which is connected to the 1st pin of the jack, and the other end is grounded.

[0043] When the 2-pin 3-pin of the grounding switch S4 is connected, it is output grounding, and when the 1-pin and the 2-pin of the grounding switch S4 are connected, it is output floating ground. The grounding switch S4 can eliminate the noise caused by grounding.

Claims

1. A multifunctional DI cartridge, characterized by: It comprises an input interface, a first selection switch, a first signal attenuation circuit, a second selection switch, a second signal attenuation circuit, an amplification circuit, a power supply circuit, a third selection switch, an output circuit and an output interface.

2. The multi-functional DI cartridge of claim 1, wherein: A through socket is arranged, and a ground end of the through socket is connected with a signal output end of the input socket.

3. The multi-functional DI cartridge of claim 1, wherein: A grounding circuit and a grounding switch are further arranged, and the output interface is grounded through the grounding switch.

4. The multi-functional DI cartridge of claim 3, wherein: The grounding circuit comprises a resistor R6 and a capacitor C4, and the resistor R6 and the capacitor C4 are connected in parallel, one end of which is connected with the pin 1 of the jack, and the other end is grounded.

5. The multi-functional DI cartridge of claim 1, wherein: The first signal attenuation circuit comprises a resistor R1, a resistor R2 and a resistor R32, and the signal input by the input interface J1 is attenuated by the resistor R1, the resistor R2 and the resistor R32 and then input to the next stage.

6. The multi-functional DI cartridge of claim 1, wherein: The second signal attenuation circuit comprises a resistor R11 and a resistor R21, and the signal of the previous stage is attenuated by the resistor R11 and the resistor R21 and then input to the next stage.

7. The multi-functional DI cartridge of claim 1, wherein: The amplification circuit comprises an operational amplifier U4, which is coupled to a resistor R26 through a capacitor C14 and then enters the pin 3 of the operational amplifier U4, and is output from the pin 6 of the operational amplifier U4, the pin 2 of the operational amplifier U4 is connected with the pin 6, a capacitor C18, a resistor R35, a resistor R22 and a resistor R34 constitute a half voltage circuit connected with the pin 7, and provide a half voltage for the operational amplifier U4, and a diode D5 and a diode D6 are arranged to prevent the input signal from exceeding the power voltage of the operational amplifier U4 and to protect the operational amplifier U4.

8. The multi-functional DI cartridge of claim 7, wherein: The power supply circuit comprises a 48V phantom power supply and a transistor Q1, the jack J3 is connected with the 48V phantom power supply, specifically, the pin 2 and the pin 3 of the jack J3 are connected with the 48V phantom power supply, the power supply is filtered by a resistor R9, a resistor R10 and a capacitor C8 and then enters the collector of the transistor Q1, a stable 24V voltage is provided for the base of the transistor Q1 by a resistor R8, a capacitor C7 and a diode D14, and is output from the emitter, a resistor R7 and a capacitor C16 constitute a power filter circuit, and a diode D8 is connected between the emitter and the collector to prevent the transistor from being broken down when the output voltage is much higher than the input voltage.

9. The multi-functional DI cartridge of claim 7, wherein: The operational amplifier is TL061.

10. The multi-functional DI cartridge of claim 1, wherein: The power supply indication circuit further comprises a diode LED15 and a resistor R51, the diode LED15 and the resistor R51 are connected in series and grounded, the diode LED15 is a power supply indication lamp, and the resistor R51 is a current limiting resistor of the indication lamp. The output interface is a jack interface.

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