This gun-like sound effects circuit is based on the PLL4066. The circuit was found in the December 1989 issue of Radio Electronics magazine and already includes a small amplification stage.
Using a common crystal diode and a 741, this circuit can be used to detect microwaves. The circuit is...
The two circuits shown show how to obtain an SSB / CW control for receiving this signal top at a...
The oscillation of the relay causes the applied audio signal to deform and start to resemble the...