Pyrography pens don’t cost that much. The variable power supply they plug into, though: that’s another story. Those cost more than they probably should. [td0g] took the plunge into pyrography ...

[Guido Socher] built himself a great little bench power supply that’s able to put out 30 Volts at 2 Amps. Instead of taking the easy way out by putting a few taps on an ATX power supply ...

You’ll also see how this DIY motor powers various Lego contraptions. Finally, we’ll connect it to a power supply and push it to its limits to explore how it performs under maximum load.