This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
The two circuits we suggest are from the book Optoeletronics - Theory and Practice by Texas...
This circuit was suggested by a 1967 Electronic Design. Modern equivalent transistors can be used....
Higher power for an operational amplifier can be obtained with a step with complementary output. The...