This circuit was found in a 1967 General Electric manual. It is intended for the control of high voltage Nixie pipes used at the time. SCRs may be equivalent.
We found this circuit in an English publication from the 1980s. The circuit uses current...
This circuit is from an old 80's linear circuit manual. The configuration can be implemented with modern...
This very simple continuity tester uses a small 1.5 V lamp (type used in flashlights). Can be...