Soldering iron from a MOSFET transistor irf3205

This may seem strange and unusual. A soldering iron from a MOSFET transistor. How is that? The whole point is that powerful transistors can work at high temperatures, and the semiconductor crystal of the transistors is located or has contact with the flange, it is needed to remove heat. So the heating of this transistor flange can be used as a tip

I used the IRF3205 transistor as a heating element and soldering iron. This transistor works quietly at temperatures up to +175 degrees Celsius, and its dissipated power reaches 200 watts. A two-hundred-watt soldering iron! Transistor from IRF

How does such a soldering iron work? I connected an incandescent lamp to the drain and supplied 5 volts. If you do not touch the terminals of the transistor, it will be closed and the lamp will not light.

I touch the drain-gate terminals with my finger and the transistor opens and the lamp lights up. To turn off the lamp, I need to touch the gate-source terminals with my finger and the transistor closes.

Since the soldering iron supply voltage is 5 volts, the transistor will not be fully open and the open channel resistance will be 1 ohm (approximately), which is the heating element of the soldering iron. The positive terminal of the power supply should be connected to the drain, the negative one to the source of the transistor. The power wires should be copper multi-core and provide a current of 5 amperes. Button 1 is connected between the gate and the drain. Button 2 is connected between the gate and the source. By pressing button 1 we turn on the soldering iron, by pressing button 2 we turn it off. By pressing the button, you can adjust the temperature of the soldering iron. The soldering forms the flange of the transistor.