This circuit was found in volume 5 of the 1995 Encyclopedia of Electronic Circuits. The circuit is based on delayed triggering of SCRs that control a DC load.
This simple circuit allows testing of general-purpose diodes and rectifiers and also general...
This circuit not only indicates when the battery is on but also when it is low. The circuit is...
This circuit shows how to add a 1st regulator to a source that already has a step for this...