This timer with two unijunction transistors and one SCR was found in an American documentation from 1964. The unijunction transistors could be the 2N2646.
This circuit is intended to detect when current flows through the opening of a car door. The...
This low power metronome produces pulses in a small loudspeaker. Pule rate is adjusted by P1 and...
This circuit uses a 4020 counter that divides the frequency up to 210, being found in a former...