Found in ancient American documentation this circuit uses semiconductors from the thyristor family such as SCRs, Triacs and unijunctions. The circuit can control loads up to 550 W with the indicated triacs.
This circuit was obtained in a 90’s Popular Electronics. The operators admit equivalents such as...
Found in a May 1988 Radio Electronics issue, this is a Smitt trigger that requires a symmetrical power...
Suggested by the 90s ARRL Handbook edition, this circuit aims to reduce or cancel noise at the...