This 9 V battery eliminator was found in Radio Electronics magazine from June 1966. The transistor is of medium power and must be equipped with a small heat sink.
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...