This circuit was found in an American documentation from the 90's. The transistor is a general purpose one. The circuit oscillates well between 12 and 30 MHz with the indicated components.
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...