This circuit is from a 1977 Radio Shack manual. The photocell is an LDR and the operational one is a 741. Components with non-standard values can be approximated.
This circuit was found in an 80's Radio Electronics. The circuit multiplies the frequency of a low...
This circuit can be interleaved between guitars and guitars to give the fuzz distortion effect. The...
A complete test for opto-couplers can be made using the circuit Bellow. The function generator...