This project is sponsored by JLC PCB.
You can visit JLC PCB at : https://jlcpcb.com/HAR
LM386 Op-Amp: LM386 is a versatile and widely used audio amplifier IC. It operates with a low supply voltage, making it suitable for battery-powered applications
Amplification Circuit:- Connect Pin 2 of the LM386 to the input audio signal.
- Use a resistor network to set the gain according to your requirements.
- Use the first LM386 for bass control and the second for treble control.
- Implement a simple RC filter network for each tone control. Adjusting the potentiometers will alter the cut-off frequencies, thereby controlling the bass and treble.
1.Amplification Stage:
- Connect Pin 1 of the first LM386 to the input source.
- Set the gain using resistors between Pin 1 and Pin 8 of the first LM386
- Connect Pin 2 of the first LM386 to a bass control potentiometer.
- Use an RC filter between Pin 2 and Pin 5 to control the bass frequency.
- Connect Pin 2 of the second LM386 to a treble control potentiometer.
- Use an RC filter between Pin 2 and Pin 5 to control the treble frequency.
- Connect Pin 5 of the second LM386 to the positive terminal of the speaker.
- Connect Pin 4 of both LM386 ICs to the negative terminal of the speaker.
- Connect Pin 6 of both LM386 ICs to the positive side of the power supply.
- Connect Pin 3 of both ICs to the ground of the power supply.
- Connect the input source and power up the circuit.
- Adjust the potentiometers to control bass and treble.
- Verify the amplified audio output through the speaker.
Conclusion:This project demonstrates the construction of a basic audio amplifier with tone control using LM386 Op-Amps. It provides an understanding of amplification, tone control, and audio signal processing.
Applications:- Portable Audio Systems: Build compact audio amplifiers for portable speakers or headphone amplifiers.
- Home Entertainment Systems: Integrate the circuit into home stereo systems for better control over audio output.
- Educational Purposes: Use the project to teach basic analog electronics and signal processing concepts.
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