Remove these ads by
Signing UpStep 1The Parts
- Thermoelectric Cooler ($14.75)
- Power Supply ($4.75)
- Motor ($1.25)
- Magnets x2 ($0.66 total)
- Potentiometer, 5K ($1.00)
- Switches x2 ($2.00 total)
- LED ($0.10)
- Enclosure ($1.95)
| « Previous Step | Download PDFView All Steps | Next Step » |



























![Turn Copper Pennies into Silver and Gold [Chemistry Trick]](http://img.instructables.com/files/deriv/FEY/BTMU/G9C6ZF01/FEYBTMUG9C6ZF01.SQUARE.jpg)


















Why use a TEC instead of just a heating coil?
You have forgotten to mention that your power supply will need >10 amps, which isn't exactly inexpensive (more than 30$) and you also need to lable your amperage amounts on your potentiometers, etc...