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.
We found this circuit in a 1980s American publication from Motorola. Modern equivalent transistors...
Found in a Popular Electronics from the 90s, this circuit can be applied to other operational...
This is one of the many 555 based car alarm circuits that we have on our website. We found it in a...