[FARC] Voltage booster?

[Popowsky Louis]

Hi Phil,

I haven't done either of these circuits, but normally step up circuits use a capacitor to charge through and make a RLC tank circuit.  I noticed the first circuit doesn't have a capacitor, but the second one does.

If you haven't already you might check to make sure that your LED is polarized correctly.  That's the easiest thing to get wrong.


Good luck.
Lou




On Monday, December 30, 2013 6:49 AM, Philip Karras <ke3fl at yahoo.com> wrote:
 
Has anyone built one of these? I've been trying but have yet to get it working. It such a simple circuit I can't believe I can't get it working or figure out what I'm doing wrong!

See the Instructable called, "Making A Simple Joule Thief (made easy), by ASCAS" : (They call this circuit a "Joule Thief" because you seem the steal energy from a "dead" battery)
http://www.instructables.com/id/Making-A-Simple-Joule-Thief-made-easy/

Any ideas about how to get this to work would be appreciated.

I'm using a 3-Volt white LED, and green core from a dead CFL, and about 20 turns of double wire.

Another I've come across is the Supper Joule Thief, "Make a SUPER Joule Thief Light! by clevelandstorms" at
http://www.instructables.com/id/Make-a-SUPER-Joule-Thief-Light/

Perhaps I should give that one a try instead.

73 de KE3FL,
Phil
AEC Carroll County
OES, ORS, & VE
http://cs.yrex.com/ke3fl
Karras' Corner: http://blog.solidsignal.com/content.php/1005-karras-corner
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