This circuit was obtained in a Hobbyst Handbook from 1990. The circuit can be easily assembled since the SCR can be a TIC106 and the transistor a 2N30555.
This is one of the many applications of the 555. We found it in the November 1992 Radio...
This circuit uses a capacitor to momentarily reduce the anode-to-cathode voltage of the SCR for...
The circuit below is found in the manuals of several manufacturers in the LM123 series of...