Dfferential Temperature Relay Switch by IC 741

Dfferential Temperature Relay Switch by IC 741
This is Circuit Dfferential Temperature Relay Switch .
Use IC 741 for control relay ad Diode D1,D2 for sencer Temperature . VR1 for adjusable voltage.


Source: http://www.hqew.net/circuit-diagram/Dfferential-Temperature-Relay-Switch-by-IC-741_10203.html