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USB Heater (or How to Upgrade Your Coffee Cup)

Step 2Requirements

Requirements
Now that we've done the math, let's start it. These are the parts needed:

- 1 Pentium processor (166 Mhz was used but any clock should do the trick);
- 2 resistors x 6.8 ohms, 5% tolerance, 1w (2w if possible);
- USB cable with male A plug;
- Soldering stuff, termal paste, chopstick, multimeter, electric tape, patience, etc.

I assume you've read everything untill here very carefully, so i won't keep saying about USB safety. If you still have any doubt, post a question.

The processor is not critical, as long as you don't need it anymore. Any clock rate might be good enough for our purpose... ;-)

The two resistors stripes are blue, gray, gold, gold. Make sure both can handle 1w. If you decide to use a single resistor (15 ohm recommended), the stripes are brown, green, black, gold, and this should be able to handle 2w (ok, no more safety talking from now on).

USB cables don't require great specifications, any old one should be enough.
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Author:gb78