Found in a 1969 EEE, this circuit is based on an operational amplifier of the time and on old type MOSFETs. The components support modern equivalents.
This circuit uses only transistors and was found in a 2003 documentation. Transistor 2N3055 must...
We found this circuit in Motorola's Circuit Applications for the Triac 1971 manual. The circuit is for ½...
This circuit was found in a 1977 magazine, but it can be easily assembled today using BC548...