Use of Optocoupler for galvanic isolation in audio amplifier
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YouTubeElectronics Education
Use of Optocoupler for galvanic isolation in audio amplifier
This audio isolator uses an LM324 to drive the LED inside a 4N25 optocoupler, allowing the AC input signal to transfer across an isolation barrier without any direct electrical connection. The phototransistor recreates the waveform on the output side, and RV1 sets the level. This design removes ground-loop noise and keeps audio stages protected ...
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