This power supply was obtained from an Electronic Design from the 90's. The circuit applies to other 3-terminal regulators. The maximum output current is 200 mA.
This 4-transistor signal tracer or follower was found in Radio Electronics magazine from May 1960....
This sound effect circuit uses only one integrated. We found it in a 90's EDN. The effects can be...
This is one of many power control or dimmer configurations that we have found on this site and in...