This circuit is from a 1980s Signetics documentation. The circuit separates the modulation signal from a carrier. The used components are not common today.
This circuit for testing old analog lines was published in April 1986 Radio Electronics magazine. The...
We found this circuit in a documentation from the 90's. The coil has its characteristics given next...
This is the circuit of an amplifier for a small record player or portable electrola powered by...