Second Stage Joule Thief Circuits

[nievesoliveras]

ok i get it . so i could put a 2.5 volt zener on the cap output and when it reached that it would fire the cap into the battery . Well i could go further and put a 1.6 volt zenar in series with the battery to keep it from over charging . I see the problem and the Bcap not wanting to release the scr  after it reaches 2.5 volts because it is so much higher and wont take that long before the battery fries with that amount of amperage across the AA cell . It Might work on a cap to cap system thought . I will see if i can build this and report whats it doing . Anyway Very Good Suggestion and Alex will probably consider this one or maybe already has .

Thanks . I admire your Schematic skills

Albert

I vote and nominate Jesus as "Mr. Schematic".  He does do a wonderful job.

Bill

I think it is more like 30 milliamps becomes 3 amps. But before you do that you need to go around the circuit and subtract all the things that take 1 volt like the resistors and diodes.

I do not know if this will help, and
I cannot do it, but I think this is where to look.

jeanna

Thank you @gadgetmal and @pirate.

@lady jeanna.

I said 850A because I read that somewhere as a comentary of the 650F capacitor.
It is good your information for the one that is going to finish the task of tamming the amperage and voltage used as feedback to the source.

All the tools are on the screen now and @gadget understood the idea I wanted him to understand and began to build and test. I am almost happy.

To be completely happy we need a success from the group.

By the way congratulations Lady @jeanna for your @jeanna's light!!!

Jesus

[gadgetmall]

@Jesus
         I tried your circuit and it Engages however it wont let go once it started . I also did not want to pull anything from the bcap at all until it was ready to do work . 2 volts and over . The reason is it takes a long time to charge with a standard JT . Thus this is why i need Improvements for faster charge time ,a better winding and better transistor . This works as a demonstration as is however I want to push it a bit harder and might decide to use a c or d cell instead and also  a darlington to test this . . And a two inch toroid . Cost for this project  May indeed be the maximum allowed . I think Three hundred ,and now with the only outlet for an ultracap being Maxwell dealers including Mouser Electronics  they alone will be 100+ each .  I have way too many things going on ,Christmas is right around the corner and i need to pay more attention to My daughter's  Love and put up our Tree and Get into the Spirit. Also i have so many orders i will probably shut My site down until after Christmas so i can catch up . Right now i am two weeks behind on two Machine device orders .All others have been Shipped . Pulling from the battery is no concern because it has a recharge source while pulling from the bcap is precious and must be reserved at all cost  to do two functions One to recharge the battery after it gets to 2 volts and the other is power a load be it thermal couple module or Lights and be able to switch off when that work has drained it to under unity of the battery supply . Also anyone with Supercaps as high as 10f to 30 f Might replicate this experiment using a smaller battery than an aa cell . AAA should work with a 10-30f supercap although i don't know . I have some coming to test and see if they come anywhere near the power of an aaa battery . I don't know If a 30farad Supercap will output a continuous source of 2.5 volts at a given amperage or not . From little Cubes that i made i do know they can last over 27 hours powering a Jt and lighting a super bright led so if the little Scap can run that long then it makes since that the led can be replaced to charge a larger supercap to do exactly what  we want the large Ultracap to do ? Ok back to work / l8r . We need a lower powered auto switch that can handle the large current from the Bcap . Its over 3000amps . I hate to wast that thru a resistor trying to dampen it down  ,although this might be filtered thru the thermal heat device to add to the 1 watt needed . Be it heat energy cold energy Light of what ever . It dosnt necessarily have to be all in one place this 1 watt . Many things going on should be added together in the calculation  to complete he final power it produces including simple Heat from components . 

[jadaro2600]

This is a simpler solution but the parts must be of a quality to withstand the amperage you mentioned.

This is used on the wind turbines as a shunt regulator. Maybe it works on your project.

Jesus

A zener will create a voltage reference point.

I was thinking, that large caps like to discharge fast, just as they were intended for applications which normally bear a large load across their terminals - in systems with use for large currents, like engine starters, etc, or where there is need to maintain a certain ampere flow in a given system.

It seems reasonable to say that the discharging of a capacitor of equal voltage characteristic of a battery, will have higher ampere characteristics then that of the said battery because the battery has a higher internal resistance than that of the capacitor.

http://en.wikipedia.org/wiki/Internal_resistance

Perhaps the impedance characteristics of the capacitor could be matched to the battery without effecting the available energy stored therein.

[innovation_station]

ok

the reason for the b cap starter .. is cuz stage 2 uses some grunt... this is why i tryed to get people to NOT BE CHEEP. as much as you hate to spend money ... you will have JUNK  other WIZE..

lets assume i use 2.6vdc 100 amp as input to stage 2 ... RECONNECT TRANSFORMER .. STYLE 

stupid simple ... but still you want mili amp draw ... I DONT GET IT ... ? ! ? ! ?


w

how many 100 thousand aa can be charged .. from 1 bang .. that big ... ?

[guruji]

Hi Gagdetmall is it better maybe to run the heater circuit with a 12v battery so that the cap will get faster charge than a 1.5v?
Thanks