This circuit was found in a 1964 Electronic Design. The components are of the time, and modern equivalents can be used. Note the multi-emitter transistor.
This circuit has a thermal chamber that acts as a stabilizer, compensating for the ambient...
The Toshiba TLP577x series consists of an infrared photo-emitter (IR) and a sensor integrated circuit...
This circuit uses an unusual PLL, the 4046 CMOS. We found it in the October 1994 issue of...