This circuit was found in General Electric documentation from 1966. The circuit is suitable for any triac. It can also operate with other mains voltages.
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...
This circuit can generate signals in the range of 50 kHz to 500 kHz using appropriate crystal. The...
Found in a 90's EDN, this circuit controls both the speed and the direction of rotation of a...