We found this receiver circuit for modulated light in a 90s Popular Electronics. Equivalent audio amplifiers can be used. Transistors are commonly used.
This circuit was found in an American 1980s documentation. Dual FETs can be replaced by single...
August 2016 - It can be obtained from Mouser Electronics the new single controller LCD S1D13L04 from...
Found in an 80's Hands On Electronics, this circuit turns on a light when it gets dark and goes...