Although soldering irons are quite cheap, widely available and come in various shapes and sizes, let’s try to make one from scratch. This involves some basic knowledge of electronics and some DIY abilities. However, please note that building electrical devices carries risks, and I recommend exercising caution to fire, burns, or other hazards.
This article will describe some simple to build soldering irons that can provide 15 – 60 W and are powered at low voltage (5 – 20 V, depending on heater wire you use). This means you can power it with any power supply that meets these requirements (a computer power supply or notebook charger will be a good choice because it is also short circuit protected).