This simple low current circuit was found in a Radio Electronics magazine from August 1960. The circuit does not use transistors in regulation, but only zeners directly.
This traditional relay configuration, found in old documentation, is intended for 2A relays for...
This circuit was found in a book on transistors from 1954. It works by the beat that is detected by...
Using an LF356 operational, this circuit was found in the September 1989 issue of Radio...