Designed to operate with a video camera, this small transmitter was found in the February 1993 issue of Radio Electronics magazine. The microphone is electret.
The search coil of this detector consists of 140 turns of wire 18 in an 8 inch diameter form. The...
This circuit was found in a 1989 documentation and was intended to be part of a presence...
In the figure we show a configuration for a crystal controlled overtone oscillator using a...