This circuit is from a 1965 Motorola manual. It can be implemented with a common 2N2646 and a 106 Series SCR without problems. The pulse transformer has a 1: 1 turn ratio.
Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power...
This simple intermittent siren circuit was found in a 1989 documentation. Both the intermittent and...
We found this circuit for receiving shortwave on a mediumwave radio in a 1986 Hobbyst Electronics PE. The...