Boxed Joule Thief

My little "Joule Thief" caught in a box. This is Kubikop's circuit that encludes a switch (DPDT) to swap the two NiMH AA batteries.

Category:

Science & Technology

Tags:

• Joule Thief
• Energy
• Environment

[kubikop]

Nice, I like the Box you have put it in.

Im glad your switch is working well. I think Im going to try it with the switch again and also with a relay.

I think that if you switch it quickly or at a 'tuned speed' it may become more efficient!

Paul.

[Lidmotor]

Paul I think that a Bedini cap pulser circuit might work on a larger version of this. When I built one for another project I found that it took 30ma to run it.__*.*__

[jipidibipity]

congratulations

[Mrinfoone]

@kubikop Can you send me an email at dababietiger@netzero.com on the parts need to make one...thxs.

[iswindowsavirus]

how long did it last in the end? or did you just get board with it!

[digitallyhere]

ya you have a 'teala switch' circuit there, let me guess its still running? you just have to make sure the charge current does not exced the battery's spec, u kno, C/10

[stevesrd]

i like it..

[Lidmotor]

OK Thanks . I will give that a go today and see if I can tell for fast my little"Thief" is running.

[Drevtoobe]

To measure frequency on your scope let's take a simple example: You set the time base to 1 msec per division and look at a waveform. You notice the width of one full cycle of the waveform is exactly one division on the screen. Therefore the period of the waveform is 1 msec, and you invert that to convert it into frequency: Freq = 1/Period = 1/0.001 = 1000 Hz

To get a more accurate frequency measurement measure the total period for 10 or 20 cycles.

As easy as pie! lol

[Lidmotor]

I looked at JT wave forms today on the scope and you are right they CAN be sinusoidal. Mostly they look like a child's drawing on a bad day. LOL They are all over the place. An electronic Kaleidoscope.

[Drevtoobe]

To quote Ren, "Lid you must also understand that there is another factor in these resonating circuits......the battery! It is integral, and it resonates along with the circuit."

The battery doesn't resonate. As the battery starts to die though, and starts to choke on the load of the JT circuit, it's safe to assume that there may be some affect of the JT oscillator frequency. It depends on the design of the oscillator itself.

[Drevtoobe]

So, it is like comparing apples and oranges. The concept of 'finding' the resonant freq for the best performance in the JT does not really apply. It is purely a numbers game for how well it works: The energy per pulse times the pulse frequency gives you the output power. The output power could be calculated by charging a cap and taking some measurements.

On one or Aromaz' last clips I described what LC resonance is about with a touch of floral language. :)