Making a half-duplex walkie-talkie circuit diagram with LM386

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This circuit is designed to operate in a "half-duplex" mode, which means that only one party can speak at a time between the main unit and the extension. The other party can listen but cannot speak simultaneously. The switching between listening and speaking is controlled by a switch labeled S1, which is located on the host side. When S1 is in the position shown in the diagram, the extension can speak while the host listens. If S1 is toggled down, the roles are reversed—now the host can speak and the extension listens. On the extension side, there is only one speaker, BL2, which functions as both a microphone and an earpiece. The same applies to the host’s speaker, BL1. The LM386 IC is used as a power amplifier in this design. The input signal is connected to pin 3, and the output is taken from pin 5. Capacitors connected to pins 1 and 8 help adjust the gain of the circuit. The power supply voltage can range from 4.5V to 9V, making it compatible with various battery sources. This simple half-duplex walkie-talkie circuit is ideal for basic communication applications where two-way voice transmission is not required simultaneously. It's a great project for electronics enthusiasts looking to understand the fundamentals of audio amplification and signal switching.