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DIY Heating Pad - (small Electrical Blanket)
I still have to make mine and I'm not an expert on the subject, but try using your propane to light a barbeque or something and see if that works, if it works check the size of the holes you drilled it might make a difference.
Burning TV B Gone Firmware Using Arduino
$3.50 DIY TV-B-Gone Micro
Wireless Animatronic Hand
Wearable FM Transmitter(250 m range,easy setup)