This circuit was found in a 90s American publication. The same configuration appears in several places on this site, obtained from different sources. The lamps can be replaced by LEDs.
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We...
This isolated non-synchronized triac and optocoupler circuit was found in the August 1992 issue of...
Found in documentation from the 1980s, this circuit can be used with other operational ones. The...