However, in the video we show you how to make it big, large enough (1) to make with clumsy hands and (2) that you can see what we’re doing.Īfter the jump, some detailed photos of how the coil is wound in case you need more detail than in the video. The original site where we learned about the Joule thief shows you how to make a miniature version of this circuit, such that you can fit it in a tiny flashlight. To learn how to make one, watch the video, which is available in a variety of formats. That’s well below the point where your other toys will tell you the battery is dead, so it can steal every last joule of energy from the battery (hence the name). Not only does it work with a brand new battery, but it works until the battery is nearly dead– down to 0.3 V. But using the Joule Thief, it works like a charm.
But a 1.5 V battery like a AA cell simply will not work. Normally, if you want to light up a blue or white LED you need to provide it with 3 – 3.5 V, like from a 3 V lithium coin cell. So whatsa Joule Thief? It’s a little wisp of a circuit that allows you to drive a blue or white LED from a low voltage. The PDF file that goes with the podcast is here (450 kB PDF file). In this week’s Weekend Projects video podcast, Make Magazine’s Bre Pettis and I show you how to make a Joule Thief.
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