This circuit was found in a Popular Electronics from the 90s. It is based on components still common today and an optical coupler for the triac. The sensor is a thermistor.
Found in American documentation from the 90s, this CMOS circuit detects the source of a signal and can...
This circuit is from a 1964 Electronic Design. The transistors are from that time. They can be...
This circuit was found in 1960s Radio Electronics. The circuit uses components from that time. The...