This circuit appeared in Radio Elecronics magazine in 1968. The operating circuit is a general-purpose type at the time and the power supply must be symmetrical.
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...