100 mA regulator (CB21168E)

This 2-terminal regulator was obtained from a 1990s National Semiconductor manual. The components admit modern equivalents.

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...