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Piggyaxe Joule Thief Kit

Order Code:  

70-1059

Brand: Piggyaxe MPN: .
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1+ £2.48

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132 In Stock
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A kit of parts to build the ultimate 'Green' circuit that uses the cells that other people throw away.

The Joule thief is a simple circuit, but it delivers great functionality. Its name is derived from the concept that it's stealing energy (Joules) from the battery that powers it. Nothing special there, except that this circuit will work down to absolute cell exhaustion at around 0.5 volts. Hence the idea that its 'stealing' the last dregs of energy.


  • Ideal as a short introduction to soldering
  • Great for Cubs, Scouts, Beavers and Guides to build for a skills badge
  • Easily incorporated into a packaging project, STEM activity, Young Enterprise etc.
  • Kit contains printed circuit board and standard components
  • See Technical Specification table for list of kit contents
  • Click here to download constructional notes for this kit

Kit contains:
Order codeDescriptionQuantity
70-1058Joule Thief PCB1
62-03701kΩ CR25 0.25W carbon film resistor1
50-0297BC548C transistor NPN TO92 0.2A 30V1
50-1176470µH ±5% 90mA Epcos RF axial SBC inductor2
08-02001nF 2.5mm ceramic capacitor1
55-15493mm white LED 10000mcd 30°1
18-2906Battery box 2x AA with switch1

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Reviews


Not that bright, but novel, easy to build & neat

Reviewed by: Mr Juerg Messer - 26 June 2017
The Piggyaxe Joule Thief Kit is fairly easy to assemble. The PCB is of very good quality, there are only 6 parts to be soldered (no coils have to be wound) and the manual is well written. The manual has to be downloaded from the Data Sheet section, a paper print isn't included. The Joule Thief flash light isn't as bright as ordinary commercial flash lights nowadays, but it runs on "empty" batteries (!) and has a nice case with switch. The shipment arrived after 2 days here in Switzerland (DHL courier). Unfortunately, the kit had included the wrong LEDs (red 5mm instead of bright white 3mm LEDs). After getting back at the customer service, the right LEDs arrived after 1 week (free of charge). Summary: the kit is a good project for beginners, with good value for money. It is not very bright but it is novel and comes complete with a proper case.