This circuit was found in a 1967 Electronic Design. The FET is from that time. Capacitor C is determined by the frequency of the signal worked.
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...