We found this circuit in a Mullard manual from 1960. The transistor is a phototransistor of the time. The gain is 3 dB.
The S-meter is signal strength meter, coupled to telecommunications receivers to indicate the...
This circuit is suggested by Motorola, making it possible to use an optical coupler of type 4N26...
Dynamic analyzer is another name given to a signal follower or signal chaser. This circuit is from...