The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
This oscillator produces a modulated signal using a unijunction transistor. We found it in an...
This circuit was found in the September 1989 issue of Radio Electronics magazine. The circuit uses...
Found in a 1964 General Electric documentation, this circuit uses PUTs that are not currently...