Joule Thief

[dasimpson]

Yes, exactly right as I understand it.  Higher amp draw means you may need several b-caps in parallel.  I just saw in another topic a fellow posted that Maxwell is selling their 3,000 Farad B-caps for like $90.00!!!  That sounds like an incredible deal.  That is almost 5 times the capacitance of mine.

Yes, you can dump a JT's output into a supercap.  I don't rectify it as I was thinking that wastes some energy.  Most JT circuits appear to output pulsed dc and not a true ac anyway.  The big caps capture those spikes and make them usable.

Bill

ok on that note i will give it a go with out the bridge ill just make sure to note what lead of the secoundry is posetive

[resonanceman]

the problem with looping the joule thief back into itself is that thay is not enogth current comming out of the device to counter balence whats been put in plus currewnt is what charges the battery not the voltage charging with voltage only dosent charge batterys only false charges them the way i find if a battery is charged or not is to have a 3 amp meter and connect these to ethier end of the battery a no no i know but if the bettery if fully charged i find it shows the ampage of the battery aka 2500mah batterys shows on an 3amp meter will be 2.5amps correct me if i am wrong but this is what i found i tried the voltage trick but all my dead rechargable show 1.30volts thats means they are charged but you try and power anything they wont work

Dasimpson

How many rechargable batterys have you  tried to charge?
How dead were they?

The ability  to charge a battery using  spikes is well known......
You can often  recondition  batterys that  would  be considered dead.
But  sometimes  dead is dead.
Often  people  do not  understand  that batterys are damaged if they are deep discharged........each  type of battery  has  a particular  level of discharge that can  be tolerated .......  For  a standard 12 lead acid battery the level is around 10.5V .......discharging  the  battery any lower may damage it.


Jeanna  has  a  thread about  charging  batterys  with impulses .



http://www.overunity.com/index.php?topic=8950.0

gary

[dasimpson]

dead is when my mp3 player says no battery left normaly about 1 volt but after an houre there back to been 1.2 maybe more but they is no ampage there when i charged with joule thief i did one for a few mins another for an hours and so on ethern after a day the battery was saying charged by volts but not by ampage as they still would not power my mp3 player so that tells me they are not charging

and as i say again unless you have the batterys trickle charge comeing from your joule thief they wont charge but they can be broght back from the dead as my rc remote battery has been it would not charge run it for an hour on the joule thief i then put it in the charger and it is now fully charged and working

[dasimpson]

as another point i used the proper charger and all batterys are charged i have 12 aa in total i tried 6 with the joule thief and 6 with the bettery charger same length of time the joule thief fails but reconditions them so no loss really i guess just pitty it wont charge them properly i now have all 12 vully charged i have just put a 2500mah aa on the input of joule thief and a 650mah aaa battery on the output i will leave this for a day see what happens if this wont run a motor then this dose not work as i have run the motor with a properly charged one

[resonanceman]

as another point i used the proper charger and all batterys are charged i have 12 aa in total i tried 6 with the joule thief and 6 with the bettery charger same length of time the joule thief fails but reconditions them so no loss really i guess just pitty it wont charge them properly i now have all 12 vully charged i have just put a 2500mah aa on the input of joule thief and a 650mah aaa battery on the output i will leave this for a day see what happens if this wont run a motor then this dose not work as i have run the motor with a properly charged one

Dasimpson

Your 1 day charge will not make much  difference.

John Bedini  says it takes something like 20 discharge/recharge cycles to condition a battery.

gary