How do I measure the efficiency of a Joule Thief?

[carlprad]

Hi everyone

I really could use everyones help to figure out the best way to measure the efficiency of a Joule Thief.

Lets say I have a 12v battery on the input. I plan to attach an "inline watt meter" to monitor the input power.

However, what should I place on the output end to see how efficient the Jt is?

Should I place a 12v "rechargeable" battery on the output end and see how much of the "input" battery gets drained in order to charge the "output" battery?

In other words, what is the best setup to get a clear representation of how much I'm getting out of the JT?

Thanks everyone.

[Dark Alchemist]

http://rustybolt.info/wordpress/?p=452

I can't say it any other way that isn't covered there and more on that guy's blog but you will need to scan his pages for the info as he learns as he goes.

Good luck.

P.S. I forgot about this video to watch it is in my bookmarks - http://www.youtube.com/watch?v=KWDfrzBIxoQ

[carlprad]

Dark

Thanks for the reply.

However, and maybe I'm having trouble explaining my goal, I want to know how much power I take out of one battery, in order to charge the other battery.

Meaning, if I have one battery as my input, how can I monitor its power depletion, as I charge the battery at the output.

Is their a way to monitor the charge of both batteries, as one is being depleted, and another charged, in order to see exactly what the ratio is between them and how efficient the Jt really is?

Or, is there a better way to see exactly what the gain, in performance, I'm getting from the JT?

Thanks

Carlos

[Dark Alchemist]

The only way I have seen is using the 1 ohm method or simply having two meters with one at the giving battery and the other at the receiving battery since both have resistances it works.  If there is another method I have not seen it.

[carlprad]

I'm new to all this.

So, if you would kindly explain the "1 ohm" method and give me an idea of what the setup would look like for the two meters, I would be very grateful.

Thank you for your patience with a neewbie.

Carlos