This squelch circuit used in transmitters was found in a magazine for radio amateurs 73 in the 1980s. The circuit admits equivalent components.
This circuit can be used as a shield for microcontrollers such as the Arduino. Frequency is given...
We found this car theft alarm circuit in a 1988 publication, but the components used can still be...
This conventional slow-moving circuit uses incandescent light bulbs, but can be changed to use...