The time of this timer depends on C1. The circuit was found in the July 1994 Electronics Now magazine. The supply voltage depends on the relay and can go up to 12 V.
Photodiodes can be used to sense moving objects, such as optical switches and encoders. In the...
Found in American documentation from the 1980s, this circuit for general purpose transistors has good...
This simple circuit is intended to test the zener test. RV1 can be calibrated in terms of voltage. The...