This circuit is from a Motorola integrated circuit manual. The integrated used is no longer common in our market and the power transistor must be equipped with a heat sink.
This circuit is from a Popular Electronics from the 90's. It can be implemented with equivalent...
This transistor-based circuit has good gain and high input impedance. It was found in the November...
We found this circuit in a 1983 publication. It is a simple touch alarm circuit using a SCR type...