{"id":7935,"date":"2013-07-04T21:44:57","date_gmt":"2013-07-05T04:44:57","guid":{"rendered":"http:\/\/rustybolt.info\/wordpress\/?p=7935"},"modified":"2013-07-09T16:03:39","modified_gmt":"2013-07-09T23:03:39","slug":"2013-07-04","status":"publish","type":"post","link":"https:\/\/rustybolt.info\/wordpress\/?p=7935","title":{"rendered":"2013-07-04 Dollhausen’s Joule Thiefs"},"content":{"rendered":"

I came across this web page with some very interesting Joule Thief designs<\/strong><\/a> and I thought I should pass it on to others.\u00a0 If I can find the place, I’ll also put it in my home page.<\/p>\n

When I started building my LED voltage boost flashlights back in the 2001 to 2003 years, we were afraid we might get caught in an elevator with no light during one of the rolling blackouts that the power companies were telling us might happen.\u00a0 I had a number of small flashlights, mainly the Mini Maglites, but I wanted something that used a LED that would not burn out if it was used for a long time.\u00a0 I started building flashlights into Altoids tins, but they were too big for the pocket.\u00a0 That was when I started investigating smaller flashlights using a single AA cell and some kind of circuit to make the 1.5V drive the higher voltage LEDs.\u00a0 That was when I developed the circuit that I put into the Velamints tins.\u00a0 Here is the inside<\/a><\/strong>.\u00a0 Another one is shown here<\/strong><\/a>.\u00a0 It’s on the top of the second pile from the left.<\/p>\n

The pile shows several of the others I built during the Energy Crisis in California.\u00a0 At that time you could not buy a LED flashlight at the store; then when the first ones came out, they were fifty or more dollars, so almost no one could afford them.\u00a0 About the only way to get one was to make your own.\u00a0 So I made my own.\u00a0 What I’m alluding to is that my Joule Thiefs were born of necessity and practical needs.\u00a0 So the art factor really didn’t come to my mind.\u00a0 Nowadays, a LED flashlight is available at every store for a few dollars, and I think the art part of a Joule Thief gives it a more noble reason for its existence.<\/p>\n","protected":false},"excerpt":{"rendered":"

I came across this web page with some very interesting Joule Thief designs and I thought I should pass it on to others.\u00a0 If I can find the place, I’ll also put it in my home page. When I started building my LED voltage boost flashlights back in the 2001 to 2003 years, we were <\/p>\n

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