You will need this because solder will not stick to resistance wire.
I would recommend a 28-32 for most people. The smaller the number, the thicker the wire, the thicker the wire, the more entertaining it needs to heat up. I use 28 AWG Nichrome, but sometimes I wish I had a 30 or 32. If you can not obtain the wire these ways, take apart a toaster or a hair dryer and use that! The gauge (AWG) of the wire depends on your battery. You can buy Nichrome or Kanthal wire (the most commonly used resistance wires) online in bulk or you can get them at a vape shop. This is another item that will be hard to come by. A disposable 9v battery may be used, but it is much better to use a larger, rechargeable battery such as an RC car battery, or in my case, I dissected a portable 1000 mAh phone charging battery and used that.
This is the most important part and the hardest to acquire. If you're lucky, you might have some of these parts laying around. For this project you are going to need some parts.
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