This circuit was obtained in a 1982 English magazine. The purpose of this circuit is to interface signals other than TTL circuits with TTL inputs. The transistor can be a BC548, 2N2222 or any equivalent.
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...