This thermal control circuit appeared in Radio Electronics magazine in October 1958. The circuit is powered by the power grid and has two sensors that operate in a differential mode.
This amplifier with differential input uses two old op amps but can be implemented with modern op amps....
The main feature of this circuit is that it provides a sine waveform signal. In this circuit, the...
The HA2620 integrated circuit used in this comparator is from the 80's, but the setting can be...