This toy transistorized organ was found in the May 1970 issue of Radio Electronics magazine. The trimpots are adjusted to the musical notes according to the key.
This circuit was found in old documentation and can be implemented with other operational...
This circuit is from Motorola's Linear Interface ICs from 1993. The circuit uses a booster...
Found in a 1970s American publication, this circuit is intended for color TV video signals. The main...