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.
In the figure we have a typical constant current source circuit. Transistor can be equivalent as...
The circuit shown here uses a 4047 to produce three signals whose frequencies are determined by C...
The CA3020 integrated circuit was one of the first commercial types, sold in the 1960s. The...