30 Jan '13, 12pm

Ask Hackaday: What’s an easy way to build a potentiometer for a soldering iron?

What he wants to do is build an adjustable current source. To do that from an ATX supply, he needs to change the supply’s original feedback circuit so it regulates the output current rather than the voltage. If you look at the supply schematic, you will see a voltage divider connected to the output voltage rail, which connects to a regulator IC. You need to change this circuit so the regulator IC measures the voltage across a low-value resistor, connected in SERIES with the output lead. This voltage will be proportional to the amount of current being drawn from the supply. You can then use this voltage as an input to the original regulator circuit, which will now act to keep a constant current flowing through that resistor. Next step is to find a place in the regulator circuit where you can input a voltage which represents the DESIRED current output. Add a small pot to adj...

Full article: http://hackaday.com/2013/01/30/ask-hackaday-whats-an-easy...

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