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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.
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.
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