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The typical application circuit of photoelectric couplers in

2014-11-26 03:03  
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The typical application circuit of photoelectric couplers in audio amplifier circuits
By fixing photoelectric couplers in audio amplifier circuits, not only the signals can be separated and the noise between stages can be impeded, but the audio signals can be amplified. In the circuit, photoelectric coupler can replace the audio transformer and overcome signal consumption and distortion, etc, it can also reduce the magnetic interference and the like. In the figure, VT1 and VT2 form a two-stage direct coupling amplifier circuit. The sensor or source signals are sent into the preamplifier consisting of VT1 and VT2 with the help of C1 and R1.