[FARC] [K3PZN-List] Voltage booster?

[eric blade]

I would try the following:

1. Check the LED to make sure it is actually working (For me it's usually the silly things like this or polarity)
2. verify you have the leads on the coil the right way.   One coil induces current into the other so if they are both going the same way you get no oscillation.
3. put a scope or meter with duty cycle on the coil leads and verify you have oscillation.  This will also tell you your duty cycle and you can guess if it is enough to make the LED visible.


Sounds like fun stuff! 

Eric
KB3RPP





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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