Rectangular and triangular generator (CB21333E)

This circuit, based on a 555, was found in a Popular Electronics from the 90s. The circuit has the frequency determined by R1, R2 and C1.

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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...