This circuit of an Electronics Hobbyists Handbook uses a different configuration for a triac. The circuit uses an integrated frequency divider and a coupler with a fotodiac.
The JFETs of this old circuit admit modern equivalents and their characteristics determine the maximum...
This is a well-known RC oscillator configuration using a 741 operational amplifier. The circuit is from...
This interesting circuit was found in a 2006 publication. It is a timer that controls the engine...