Every technician uses soldering iron in different power rates such as 10W, 20W, 25W, 30W etc. It is very difficult to change the soldering iron each time with specific uses. Here is a solution to this problem by assembling a simple temperature controlled soldering iron circuit which enables you to use your soldering iron in variable power rates from 10w to 35W.
Circuit Diagram of Temperature Controlled Soldering Iron: Click to enlarge
Working
The above situation can be achieved by connecting a rotary switch. You should connect the phase line to the blue line represented in the circuit schematics. Also, connect the black wire to the power socket which the soldering iron has to be connected. Supply the neutral line of the soldering iron externally. Actually we adjust the the voltage to the gate terminal of the triac BT 136 so that the we get the output current according to this voltage. This controlls the temperature of the active soldering iron.
The above situation can be achieved by connecting a rotary switch. You should connect the phase line to the blue line represented in the circuit schematics. Also, connect the black wire to the power socket which the soldering iron has to be connected. Supply the neutral line of the soldering iron externally. Actually we adjust the the voltage to the gate terminal of the triac BT 136 so that the we get the output current according to this voltage. This controlls the temperature of the active soldering iron.
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