This circuit is from a 1974 publication by Motorola. The unijunction may be 2N2646 and bipolar BC558 and BC548. The pulse duration depends on the capacitor.
We find this circuit in a Popular Electronics of the 80's. The frequency range depends on C1 and...
This circuit can generate signals in the range of 50 kHz to 500 kHz using appropriate crystal. The...
This circuit was found in the July 1978 issue of Radio Electronics magazine. The circuit uses a...