This power supply protection circuit was found in the December 1978 Radio Electronics magazine. The SCR is triggered by shortening the power supply and quickly blowing the protection fuse.
This flasher was found in the September 1984 Radio Electronics magazine. The frequency is given by...
Found in documentation from the 1990s, this circuit uses an integrated radio from the time and has...
We found this circuit in a 1981 documentation. The circuit can still be easily assembled, as it...