This circuit was obtained from an 80's EDN. The components used are still common. The circuit can be used as a shield and the frequency is approximately 775 Hz.
We found this circuit in the July 1994 issue of Electronics Now magazine. The circuit can use...
We found this circuit in a 1983 publication. It is a simple touch alarm circuit using a SCR type...
June 2017 - Mouser Electronics has in stock the new HumpRO frequency hopper transceivers from Linx...