This circuit was found in a 1980s documentation. The diodes may be general purpose diodes such as 1N34 or 1N60 and the indicator may be the lowest current range of a multimeter.
This circuit is from a 1974 publication. It generates a pulse with several sinusoidal cycles from...
This circuit is indicated for applications powered by 12 V sources. The battery is 12 V according to...
This LED signaling circuit uses a programmable unijunction transistor (PUT) as a relaxation...