This circuit was found in a 1968 General Electric manual. The circuit is for 3 A motors but can be changed according to the SCR used. The SCR is type 106 and R1 is 10k.
This circuit monitors the temperature of soldering irons, taking them when necessary to a low...
The traditional circuit was taken from a French magazine Radio Plans that no longer exists but can...
In this circuit the CA3140, an operational amplifier, is used as a comparator with the zener diode...