Sinusoidal peak detector (CB21519E)

This circuit for a frequency of 10 kHz was found in an Electronic Design. It makes use of a tunnel diode. The transistor admits equivalent.

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Signal tracer (CB23671E)
This 4-transistor signal tracer or follower was found in Radio Electronics magazine from May 1960....
Sound effect (CB9213E)
This sound effect circuit uses only one integrated. We found it in a 90's EDN. The effects can be...
Triac Dimmer (CB24124E)
This is one of many power control or dimmer configurations that we have found on this site and in...