This circuit is from a Radio Electronics from February 1966. The circuit is of a type that was found in many applications at the time as output from radios, televisions and other equipment.
This circuit uses one of two D-type flip-flops available on an integrated circuit 4013. The...
This other high stability thermocouple amplifier uses an 80's operating. The circuit can be used...
This circuit was found in a 1967 General Electric manual. It shows a SCR control with unijunction...