This Schmitt optical trigger with LDR was found in old documentation. The relay must be sensitive, or an additional step must be used to trigger it.
This set-rest relay uses two SCR and two switches to control a DC relay. The circuit can be used...
This simple power supply for transistors was found in documentation from the 1940s. The...
The purpose of this circuit is to measure the absorption current of a capacitor. Dielectric...