Joule Thief

[conradelektro]

@stprue

I would like to ask you to post one or two of your more powerful JT's (may be modeled after hazens designs).

You (or hazens) propably posted them somewhere before, but it is a very difficult job to find good posts in hundreds if not thousands of pages.

Greetings, Conrad

[gyulasun]

Hi Conrad,

here is hazens1 all posts:
http://www.overunity.com/index.php?action=profile;area=showposts;u=12452

Gyula

[conradelektro]

@ Gyula,

thank you for the link, hazens did post nice stuff, I have to go through it in more detail tomorrow.

Can I find myself the posts of other people? I wanted to do that several times but could not figure out how it works?

How did you get hazens number (at the end of the link)?

What one sees, hazens stopped posting last summer (at leat as "hazens").

Greetings, Conrad

[jadaro2600]

SO I picked up 17 flatbed scanners from a thrift store recently - decent price too - I got 17 Cold Cathode florescent tubes and 17 inverter boards ..i found one board made by the Garear company which only uses 30ma at 16 volts.

There was quite a bit of nice electronics there two, i must have 50 doubled sided mirrors and two dozen stepper motors now.  Theses solid stainless steel rods are nice as well.

On a second thought, does anyone know of any place that will pay for recyclable circuit boards? ... I've had a recent buildup.

Tomorrow I plan to work with a few JTC's and power one of these lamps.

..got a lot of plastic to get rid of also.

These lamps run cold ( relative to their CFL counterparts ), as their name implies, they produce very little heat and a nice light.  some of the boards use quite a bit of electricity, so they'll most liekly end up useless - I'll probably be diagramming the most efficient cool running one.  I've been testing with a 12, 16, and 18 volt source.

[conradelektro]

@ jadaro2600

It would be very interesting to know at what frequency the Cold Cathode florescent tubes in your 17 flatbed scanners are driven?

Since I got interested in the frequency of Joule Thief circuits I found out that the conventional "CFL, FL, neon an cold cathode lamp drivers" (I looked at), are driven with a frequency in the audio range (which I find annoying).

Greetings, Conrad