Early on in my JT experiments I experimented with a pot (potentiometer) in place of a resistor, which was used as an adjustable resistor and allowed me to optimize that particular JT. After the optimum setting was determined, the pot could be removed and replaced with a regular resistor. It seemed that the pot was
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This Instructable tells how to build a LED flashlight that is connected to and derives its power from the telephone line. If you can’t take the time to read this, at least read the conclusion at the end. First off, I must warn the reader that this is illegal, foolish, dangerous and can cause problems
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Clarification: People have asked if the three windings explained in the schematic are in series or parallel. The three are in parallel, in other words, solder three of them together on each end. But make sure you use an ohmmeter to find and separate the other (4th or feedback) winding from the three. In Jan,
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In Jan 2009 I collaborated with Quantsuff and we tried different designs for a low voltage Joule Thief. The conventional silicon BJT Joule Thief (bipolar junction transistor) has a base to emitter forward voltage of about 0.55 to 0.6 volts, so if the supply is below this voltage it will not start. But once it
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I built this Blue Blinky and installed the partly used AA cell on Dec 1, 2007. For most of the next 21 months, on or about the first of the month I published a short blog on how it was doing. As the cell ran down it got dimmer and dimmer, but continued to flash,
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Back in 2000 and 2001, Californians faced an electricity shortage crisis caused by market manipulations by companies the likes of Enron that stole tens of billions of dollars from Californians. The electric companies implemented rolling scheduled blackouts to prevent unexpected outages. During that time, many people were afraid of being caught in a dark place
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