LED Flasher Unijunction (CB22144E)

The frequency of this circuit depends on the capacitor. The unijunction transistor can be the 2N2646.

1 kHz Oscillator with Filter (CB25581E)
This circuit with signal acceptance filter was found in the June 1993 Electronics Now magazine. Other...
Complementary Transistor Oscillator (CB946E)
This oscillator uses germanium transistor avaialble in 1958 when the project was published....
Bandpass filter (CB24286E)
Suitable for audio signals in electronic music, this circuit was published in the September 1973...