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 old documentation for radio amateurs, being indicated for...
This configuration, found in many publications, is from an American book from 1981. The power...
Found in a 1970s documentation, this circuit has a flat response from 15 Hz to 130 kHz. Modern...