Joule Thief

[electricme]

@Ist
Recharging 1.2v batt from a higher voltage.

I tried this yesterday and got hit pinkies for my trouble, I soldered a diode to my 1.2v batt holder, connected the lead from a full batt and the diode got very very hot.
I might have to put a Zenner in series with a suitable resister and Transistor to peg back the voltage, got to do some thinking about this though.
A few posts back I asked about another circuit involving a LM317 as it needs 3v or higher head room to operate, and the batt driving the circuit is at 1.2 or in some cases 1.5v. I was going to use the LM317 to set the amount of current to the 1st battery to keep it toped up
.
I think the Zenner is the way to go for the time being, until we get better info, what do you all think?

General Jim

[Mk1]

@ all

Is there a expert on hall effects in here!

@electricme

Do you have the charger for that battery, to see what it is sending.

[gadgetmall]

@ All:

I have been approached by someone that wants us to develop a lighting system for them consisting of the earth battery, supercaps and the JT circuit driving leds.  They have looked over our topic here and evidently like what they have seen. I will let you know more when additional information is available.  In the meantime, keep up the great work everyone.

Bill

Bill you realize i did this allready a month ago . running two jts . i have a better system now that runs on 1 ma FOREVER ! . we can do it and i will be glad to share it or combine efforts and make it better. you know how to boost the juice on the earth sooo ..
Al

[Mk1]

@all

Any idea?

[Pirate88179]

Al:

I was going to send you a pm but I guess we can't do that anymore, at least for now.  E-mail me at: wsellis888@bellsouth.net and I'll tell you what I know so far.  Yes, I am aware that you did this already....and I am jealous because that was the reason (one of the reasons) I started this topic but I have to wait until spring, or the ground thaw to do this, ha ha.  Send me an e-mail and we can discuss what little I know. (won't take long)

Bill       ***EDIT***  However this works out, we will do this as a team made up from the experimenters on our group here.