Join Date: Mar 2012
Location: Minneapolis, MN
The tube I used was a mountain bike tube. I tried a road bike tube first, but it would not stretch enough. I agree that a bike shop would probably give you one for free. I just happened to have a buddy that had a few old ones laying around. I have to say, this setup works really well. I could use a bit more control, because they get really hot. I will plan on designing a controller this winter hopefully. I would like to do a current limiting design that would not waste excess power.