Joule Thief

[freepow]

@  Anyone who can tell me if this will work

OK.. Just say I have  2x D cells rated at  1.2v @ 10,000mA each wired together equaling 2.4v @ 10A

OK.. Now Just say I have  5x separate Joulethiefs which each have say 10 LED's each and each Joulethief draws about  50 mA's each.

OK.. I connect all Joulethiefs up in parallel with the  D battery,
so each Joulethief are drawing 2.4v @ 50mA each,  So the whole  5x Joulethiefs are drawing a total of
2.4v and  250mA.

OK.. Question !   All 5x Joulethiefs should work properly from the D battery because each joulethief is getting the 2.4v each, and each joulethief is drawing 50mA each,  So they all should work just as good as if I only had 1x Joulethief   

And the "D" battery should be able to deliver the 2.4v to each Joulethief and deliver 50mA to each joulethief 

[nul-points]

@  Anyone who can tell me if this will work

OK.. Just say I have  2x D cells rated at  1.2v @ 10,000mA each wired together equaling 2.4v @ 10A

OK.. Now Just say I have  5x separate Joulethiefs which each have say 10 LED's each and each Joulethief draws about  50 mA's each.

OK.. I connect all Joulethiefs up in parallel with the  D battery,
so each Joulethief are drawing 2.4v @ 50mA each,  So the whole  5x Joulethiefs are drawing a total of
2.4v and  250mA.

OK.. Question !   All 5x Joulethiefs should work properly from the D battery because each joulethief is getting the 2.4v each, and each joulethief is drawing 50mA each,  So they all should work just as good as if I only had 1x Joulethief   

And the "D" battery should be able to deliver the 2.4v to each Joulethief and deliver 50mA to each joulethief 

hi freepow

yes, that will be fine

the D Cell battery ratings will be 10,000mAh not mA, meaning that they could deliver, eg. 1 mA for 10,000 hours or 1000 mA for 10 hours (approx.)

so if your 5x JTs need 2.4V @250mA total, and both D cells are fully charged, then theoretically you should get 10000/250 = 40 hours of continuous operation

since JT's can operate down to lower supply voltages and still have enough o/p voltage to light LEDs, you may find that you get more than 40 hours operation!

hope this helps
np


http://docsfreelunch.blogspot.com

[Pirate88179]

@  Anyone who can tell me if this will work

OK.. Just say I have  2x D cells rated at  1.2v @ 10,000mA each wired together equaling 2.4v @ 10A

OK.. Now Just say I have  5x separate Joulethiefs which each have say 10 LED's each and each Joulethief draws about  50 mA's each.

OK.. I connect all Joulethiefs up in parallel with the  D battery,
so each Joulethief are drawing 2.4v @ 50mA each,  So the whole  5x Joulethiefs are drawing a total of
2.4v and  250mA.

OK.. Question !   All 5x Joulethiefs should work properly from the D battery because each joulethief is getting the 2.4v each, and each joulethief is drawing 50mA each,  So they all should work just as good as if I only had 1x Joulethief   

And the "D" battery should be able to deliver the 2.4v to each Joulethief and deliver 50mA to each joulethief 

Why do your JT circuits need 2.4 volts?  You can brightly light over 100 leds on a 1.5 volts AA or a D if you want longer run time.  And, if you only run 50 leds, it will run even longer.

Bill

[Pirate88179]

Electronics goldmine has boost caps on sale for $6.00!!  These are 2,600 Farad.

http://www.goldmine-elec-products.com/prodinfo.asp?number=G17960&utm_source=Goldmine+-+Alana&utm_campaign=7a8fea45e4-July21&utm_medium=email

Bill

[freepow]

@ All, Thanks for your help...

One Question ... Whats the correct or best voltage to charge   1x  rechargeable 1.2v battery   ??
                                                                               or    2x                     2.4v batterys ??
Using a Solar Cell ?