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.
This useful circuit is used to test the insulation of cables, appliances, leaks in high voltage...
This class B circuit was found in the 1960 Mullard transistor reference manual. Transformers are...
This circuit is from the American magazine that no longer exists Science & Electronics,...