[K3PZN-List] Voltage booster?

[Philip Karras]

All,

Yup, I've checked all those things, resistor, LED, transistor, & toroid.

The transistor & toroid are the "same" as the guy used. I bought a few of the transistors, not at all expensive, and I opened a dead CFL (after I got the company to issue a check to cover the dead CFL under warranty) and it was green as was one he used so I assume they were the same. On the other hand if he's on 220 volts perhaps they are not even though they are the "same" color?

I saw no difference in how he wound the pair of wires, meaning they were the same length same number of turns. so there's no difference between the two free ends as to which to use where. The other article had them different.

Nothing is oscillating as far as I can tell with my lil' RadioShack pocket probe scope. Any ideas on what you think the freq should be? I was thinking ~ 1K Hz couldn't be much more than that < 10K Hz is my thinking.

Thanks for the ideas.


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




On Monday, December 30, 2013 9:48 AM, WJJ Hoge <himself at wjjhoge.net> wrote:
  
The circuit is a self-oscillating flyback converter. The LED clamps the output at its turn on voltage. If the permeability of the core is too low or the beta of the transistor is to low, it won’t oscillate.

WJJ Hoge
himself at wjjhoge.net



On 30 Dec, 2013, at 1149 , 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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