This circuit was obtained from Dutch documentation from 1967. It uses transistors of the time which can be the BFY50 and 51 for the output and the BC series for the others.
This circuit is from a 2005 Linear Technology application manual. The circuit uses a commercial...
We found this circuit in an English publication from 1982. The power MOSFET can be of any type and the...
We found this circuit in a 1982 documentation. An intercom to be good must be sensitive and have...