The frequency of this circuit depends on the capacitor. The unijunction transistor can be the 2N2646.
This is the traditional version of a neon flasher, found in a 2004 documentation. The capacitor...
This circuit is intended for the control of a heating system motor with up to 10 kW of power. The...
This tiny photocell-powered audio oscillator was found in a book on transistors from the 1960s. The...