Low noise preamplifier (CB21936E)

This circuit with the TDA3410 was found in the SGS manual from 1982. The circuit was used in car radios and cassette players of the time.

High Speed Instrumentation Amplifier (CB4940E)
This amplifier, found in a 1980s documentation, should be powered by a symmetrical source. Modern...
Transistor voltmeter (CB20582E)
This is a voltmeter with high input resistance. The transistor is germanium. We found it in an...
Mini Timer (CB498)
Up to some minutes intervals can be obtained from this circuit. The circuit can use a lamp (or...