This circuit was found in a 1964 Electronic Design. The circuit delays the firing of a load for a time given by RC. The SCR must be in accordance with the controlled load.
An old analog TV that is not in use can be turned into an oscilloscope for low frequencies...
This circuit can be used as a base for a UHF transmitter or even a test equipment. The circuit is...
Virtually any FET can be used on this voltmeter found in old documentation. The indicator is a...