Unlike the previous circuit this one trigger when the temperature drops below the set value. The circuit is from June 1986 Radio Electronics magazine.
The purpose of this circuit found in a 1967 GE SCR manual is to control a heating element. The SCR...
We found this circuit in an old documentation. The operational amplifier of the time can be...
This power control from a 1968 Motorola manual shows how to use a contemporary diac as a...