Every true tech geek worth his or her weight in solder and flux has been foaming at the mouth over a new infomercial on TV. It’s for a device called Cold Heat: a soldering iron that reportedly stays ...

One of the easiest soldering projects to do as a beginner is to solder a resistor to an LED. You can technically put the resistor on either side, but I typically choose to put it on the long leg of ...

Here is a simple but inexpensive inverter for using a small soldering iron (25W, 35W, etc) In the absence of mains supply. It uses eight transistors and a few resistors and capacitors. Transistors Q1 ...