Stereo power amplifier circuit

Abstract

A stereo power amplifier circuit comprises a power supply circuit, and the power supply circuit comprises a power supply 5V, a first filter circuit, an MC34063 chip, an MC34063 chip peripheral circuit and a second filter circuit. The 5V power supply outputs 5V voltage to a pin 6 of the MC34063 chip through the first filter circuit, the MC34063 chip converts the 5V voltage into 12V voltage, and the 12V voltage is output through the second filter circuit; the power amplifier circuit comprises an L sound channel, an R sound channel, a coupling capacitor C1, a coupling capacitor C2, a TDA7377L chip, an L loudspeaker and an R loudspeaker; the L sound channel is respectively and electrically connected with a pin 4 of the TDA7377L chip and a pin 5 of the TDA7377L chip through a coupling capacitor C1; and the R sound channel is respectively and electrically connected with a pin 12 of the TDA7377L chip and a pin 11 of the TDA7377L chip through a coupling capacitor C2.

Description

Technical Field

[0001] The utility model relates to the field of stereo power amplifier circuits, in particular to a stereo power amplifier circuit. Background Art

[0002] A stereo amplifier circuit is an electronic circuit used to amplify stereo audio signals, driving speakers to produce sound. Stereo amplifiers typically contain two channels, one for the left (L) and one for the right (R) channel, to achieve a stereo effect. However, current amplifier circuit designs are complex and expensive to produce.

[0003] Therefore, the existing technology has defects and needs to be improved. Summary of the Invention

[0004] The technical problem to be solved by the utility model is to provide a stereo power amplifier circuit, which reduces production costs by simplifying the circuit design.

[0005] The technical solution of the utility model is as follows: A stereo power amplifier circuit, comprising:

[0006] A power supply circuit, comprising: a 5V power supply, a first filtering circuit, an MC34063 chip and peripheral circuits of the MC34063 chip, and a second filtering circuit; the 5V power supply outputs a 5V voltage to pin 6 of the MC34063 chip via the first filtering circuit; the MC34063 chip converts the 5V voltage to a 12V voltage and outputs the 12V voltage via the second filtering circuit;

[0007] A power amplifier circuit includes: an L channel, an R channel, a coupling capacitor C1, a coupling capacitor C2, a TDA7377L chip, an L speaker, and an R speaker; the L channel is electrically connected to pin 4 and pin 5 of the TDA7377L chip via the coupling capacitor C1; the R channel is electrically connected to pin 12 and pin 11 of the TDA7377L chip via the coupling capacitor C2; the L speaker is electrically connected to pin 1 and pin 2 of the TDA7377L chip; the R speaker is electrically connected to pin 15 and pin 14 of the TDA7377L chip; and pin 12 and pin 13 of the TDA7377L chip are both electrically connected to the output end of the second filter circuit.

[0008] Applied to the above technical solution, the first filtering circuit includes a filtering circuit composed of a capacitor C13 and a capacitor C9 in parallel; a common connection end of the capacitor C13 and the capacitor C9 in parallel is electrically connected to the power supply 5V, and the other common connection end of the capacitor C13 and the capacitor C9 in parallel is grounded.

[0009] Applied to each of the above technical solutions, the power supply circuit further includes a Zener diode D2; an anode of the Zener diode D2 is electrically connected to pin 1 of the MC34063 chip, and a cathode of the Zener diode D2 is electrically connected to an input end of the second filter circuit.

[0010] Applied to each of the above technical solutions, the second filtering circuit includes a filtering circuit composed of a capacitor C6 and a capacitor C7 connected in parallel; a common connection end of the capacitor C6 and the capacitor C7 connected in parallel is connected to the cathode of the Zener diode D2, and a common connection end of the capacitor C6 and the capacitor C7 connected in parallel is grounded and electrically connected to pin 2 and pin 3 of the MC34063 chip, respectively.

[0011] Applied to each of the above technical solutions, the power supply circuit further includes a sampling circuit, which includes a resistor R7 and a resistor R8; a common connection point of the resistor R7 and the resistor R8 is electrically connected to pin 5 of the MC34063 chip, one end of the resistor R8 is connected to the cathode of the Zener diode D2, and one end of the resistor R7 is grounded.

[0012] Applied to each of the above technical solutions, the power amplifier circuit further includes a filter capacitor C4, one end of the filter capacitor C4 is electrically connected to pin 3 and pin 13 of the TDA7377L chip, respectively, and the other end of the filter capacitor C4 is electrically connected to pin 8 and pin 9 of the TDA7377L chip, respectively, and is grounded.

[0013] The beneficial effects of the present invention are as follows: after the present invention inputs a 5V voltage through a 5V power supply, the 5V voltage is filtered by the first filtering circuit to make the 5V voltage stable and free of interference signals, and then the voltage is converted into a 12V voltage output by the MC34063 chip, and then the 12V voltage is filtered by the second filtering circuit to obtain a more stable and interference-free 12V voltage, which is input into the 3 pins and 13 pins of the TDA7377L chip. The TDA7377L chip works, and when the L channel and the R channel input audio signals, they are respectively input into the TDA7377L chip through the coupling capacitor C1 and the coupling capacitor C2, and then are amplified by the internal processing of the TDA7377L chip and output to the L speaker and the R speaker for playback. Such a design circuit is simple, and the power supply voltage will not affect the power amplifier circuit, thereby improving the sound quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the power supply circuit of the utility model;

[0015] Figure 2 This is a schematic diagram of the power amplifier circuit of the utility model. DETAILED DESCRIPTION

[0016] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] like Figure 1 、 Figure 2 As shown: This embodiment provides a stereo power amplifier circuit, including:

[0018] A power supply circuit, comprising: a 5V power supply, a first filtering circuit, an MC34063 chip and peripheral circuits of the MC34063 chip, and a second filtering circuit; the 5V power supply outputs a 5V voltage to pin 6 of the MC34063 chip via the first filtering circuit; the MC34063 chip converts the 5V voltage to a 12V voltage and outputs the 12V voltage via the second filtering circuit;

[0019] A power amplifier circuit includes: an L channel, an R channel, a coupling capacitor C1, a coupling capacitor C2, a TDA7377L chip, an L speaker, and an R speaker; the L channel is electrically connected to pin 4 and pin 5 of the TDA7377L chip via the coupling capacitor C1; the R channel is electrically connected to pin 12 and pin 11 of the TDA7377L chip via the coupling capacitor C2; the L speaker is electrically connected to pin 1 and pin 2 of the TDA7377L chip; the R speaker is electrically connected to pin 15 and pin 14 of the TDA7377L chip; and pin 12 and pin 13 of the TDA7377L chip are both electrically connected to the output end of the second filter circuit.

[0020] In this embodiment, if Figure 1 As shown: the first filter circuit includes a filter circuit composed of a capacitor C13 and a capacitor C9 connected in parallel; a common connection end of the capacitor C13 and the capacitor C9 connected in parallel is electrically connected to the power supply 5V, and the other common connection end of the capacitor C13 and the capacitor C9 connected in parallel is grounded;

[0021] Among them, the capacitor C13 and the capacitor C9 are connected in parallel to filter the 5V voltage of the power supply 5V input, so as to obtain a smooth and interference-free 5V voltage, so that the power amplifier circuit can avoid being affected by the power supply interference signal when playing audio, and the sound quality is better.

[0022] In this embodiment, if Figure 1As shown: Applied to each of the above technical solutions, the power supply circuit further includes a Zener diode D2; the anode of the Zener diode D2 is electrically connected to pin 1 of the MC34063 chip, and the cathode of the Zener diode D2 is electrically connected to an input terminal of the second filter circuit; the second filter circuit includes a filter circuit consisting of a capacitor C6 and a capacitor C7 connected in parallel; a common connection terminal of the capacitors C6 and C7 connected in parallel is connected to the cathode of the Zener diode D2, and a common connection terminal of the capacitors C6 and C7 connected in parallel is grounded and electrically connected to pin 2 and pin 3 of the MC34063 chip, respectively;

[0023] Among them, the output voltage of the MC34063 chip can be stabilized by the voltage regulator diode D2, and the output 12V voltage can be free of interference signals by connecting capacitors C6 and C7 in parallel, thereby preventing the power amplifier circuit from being affected by power supply interference signals when playing audio, thereby improving the sound quality.

[0024] In this embodiment, if Figure 1 As shown: the power supply circuit further includes a sampling circuit, which includes a resistor R7 and a resistor R8; a common connection point of the resistor R7 and the resistor R8 is electrically connected to pin 5 of the MC34063 chip, one end of the resistor R8 is connected to the cathode of the Zener diode D2, and one end of the resistor R7 is grounded;

[0025] Among them, the change of the output 12V voltage can be taken through the resistor R7 and the resistor R8, and then fed back to the MC34063 chip. The MC34063 chip adjusts the output voltage to 12V based on the feedback voltage.

[0026] In this embodiment, if Figure 2 As shown, the power amplifier circuit also includes a filter capacitor C4, one end of the filter capacitor C4 is electrically connected to pin 3 of the TDA7377L chip and pin 13 of the TDA7377L chip, and the other end of the filter capacitor C4 is electrically connected to pin 8 of the TDA7377L chip and pin 9 of the TDA7377L chip, and is grounded.

[0027] The working principle of this utility model is as follows:

[0028] (1) When the power supply 5V inputs 5V voltage, the 5V is filtered by the first filter circuit to make the 5V voltage stable and free of interference signals, and then the voltage is converted into 12V voltage output by the MC34063 chip;

[0029] (2) Then, the 12V voltage is filtered by the second filtering circuit to obtain a more stable and interference-free 12V voltage which is input into the 3rd pin and the 13th pin of the TDA7377L chip, and the TDA7377L chip works;

[0030] (3) When audio signals are input into the L channel and the R channel, they are input into the TDA7377L chip through the coupling capacitor C1 and the coupling capacitor C2 respectively. Then, after being amplified by the internal processing of the TDA7377L chip, they are output to the L speaker and the R speaker for playback.

[0031] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A stereo power amplifier circuit, characterized in that: include: A power supply circuit, comprising: a 5V power supply, a first filtering circuit, an MC34063 chip and peripheral circuits of the MC34063 chip, and a second filtering circuit; the 5V power supply outputs a 5V voltage to pin 6 of the MC34063 chip via the first filtering circuit; the MC34063 chip converts the 5V voltage to a 12V voltage and outputs the 12V voltage via the second filtering circuit; A power amplifier circuit includes: an L channel, an R channel, a coupling capacitor C1, a coupling capacitor C2, a TDA7377L chip, an L speaker, and an R speaker; the L channel is electrically connected to pin 4 and pin 5 of the TDA7377L chip via the coupling capacitor C1; the R channel is electrically connected to pin 12 and pin 11 of the TDA7377L chip via the coupling capacitor C2; the L speaker is electrically connected to pin 1 and pin 2 of the TDA7377L chip; the R speaker is electrically connected to pin 15 and pin 14 of the TDA7377L chip; and pin 12 and pin 13 of the TDA7377L chip are both electrically connected to the output end of the second filter circuit.

2. The stereo power amplifier circuit according to claim 1, wherein: The first filter circuit includes a filter circuit consisting of a capacitor C13 and a capacitor C9 connected in parallel; a common connection end of the capacitor C13 and the capacitor C9 connected in parallel is electrically connected to the power supply 5V, and the other common connection end of the capacitor C13 and the capacitor C9 connected in parallel is grounded.

3. The stereo power amplifier circuit according to claim 2, wherein: The power supply circuit further includes a voltage stabilizing diode D2; an anode of the voltage stabilizing diode D2 is electrically connected to pin 1 of the MC34063 chip, and a cathode of the voltage stabilizing diode D2 is electrically connected to an input terminal of the second filter circuit.

4. The stereo power amplifier circuit according to claim 1, wherein: The second filtering circuit includes a filtering circuit consisting of a capacitor C6 and a capacitor C7 connected in parallel; a common connection end of the capacitors C6 and C7 connected in parallel is connected to the cathode of the Zener diode D2, and a common connection end of the capacitors C6 and C7 connected in parallel is grounded and electrically connected to pin 2 and pin 3 of the MC34063 chip, respectively.

5. The stereo power amplifier circuit according to claim 1, wherein: The power supply circuit also includes a sampling circuit, which includes a resistor R7 and a resistor R8; a common connection point of the resistor R7 and the resistor R8 is electrically connected to pin 5 of the MC34063 chip, one end of the resistor R8 is connected to the cathode of the voltage regulator diode D2, and one end of the resistor R7 is grounded.

6. The stereo power amplifier circuit according to claim 1, wherein: The power amplifier circuit also includes a filter capacitor C4, one end of which is electrically connected to pin 3 and pin 13 of the TDA7377L chip, and the other end of which is electrically connected to pin 8 and pin 9 of the TDA7377L chip, and is grounded.

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