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Hi azul, thanks for your reply. I will go and change those things. If I don't get it to work i will ask for more help. Thanks again for your reply!
hi Azul, i'm trying to make this circuit but I can't get it to work. every time i connect my 12v supply to power the circuit the relay turns on. Even when I turn the potentiometer all the way to the left or right. Can you also explain to me what you mean with those two negative psu connection. I don't know where to connect them. As op-amp i'm using an ne5532 as transistors an bc557 and bd679. As the reference resistor i'm using aan 0,22 ohm 5 watt resistor. In the pictures you will find my breadboard layout. Thanks for your help.