Tell us about yourself!
The car adapters are more efficient. Heat wont be a concern. I'd be more concerned with the 9v battery dying, they have low capacity ):
Is this the same as http://www.ebay.com/itm/121834376546 ?
Excellent work! I wish you luck in the competition, as a judge, you have my vote!
Nice! Any stats on it?
As long as the metals are different.
I would love to judge for tech, sign me up! Thanks :)
Thanks for the idea! Personally, making enough of these to do that would be a drain, but if you do that, please send pictures!
Spooky flashing LED for Pumpkin [Halloween]
Spooky flashing LED for Pumpkin [Halloween]View Instructable »
Although I've done it before, I was soldering onto a LiPo battery pack's charging circuitry. It was one of the small, rectangular pouch types from an RC helicopter.
How to grow great crystals
How to understand binary code
DIY Penny Battery