Second Stage Joule Thief Circuits

[jadaro2600]

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

How many 100 thousand AA go bang with that one big bang?

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

12V source will damage the Cap unless regulated with a zener or unless there are 6 or more caps in series ...and this divides the capacitance to 1/6th if they're all the same.  I know this wasn't the question..  but the zener WILL shunt current back to ground ( source negative ).

[Pirate88179]

Correct me if I am wrong here but, can't you charge the b-caps with whatever voltage you want as long as you do not exceed the 2.7 volt "full" level?  I have to look back over my experiments with these b-caps to see if I ever did that...I don't remember.  I will check but I am pretty sure I have charged my 2.7 volt 650 F b-cap with a nine volt bat. at least once.  You do NOT want to over fill one of these, that would be dangerous.

Bill

[innovation_station]

indeed ... 


now what if the 100 000 aa's were replaced with a device  to produce HEAT ... to keep you warm or light so you could see ..  or flight so you could fly ... my my 
or power SO YOU CAN WATCH TV LOL .....


thank you


w

[nievesoliveras]

Thank you @gagetmall and @jadaro!!

We have a simple comparator voltage decision to solve as simple as possible on our hands here.

The need is to have the device to give a shot to fill the 1.5v and then stop and wait for the next shot.

I think that the solution is to build a circuit parallel to the bcap circuit, sharing only the negative.  It will have its own flash cap to give it its one shot and stop.

You know that it can be make to work four different ways of turning on an led with the same 1.5v. I did it once with three.

http://www.overunity.com/index.php?topic=6362.msg148135#msg148135

With that idea in mind, the circuit to be added can be designed.

Jesus

[MrMag]

Correct me if I am wrong here but, can't you charge the b-caps with whatever voltage you want as long as you do not exceed the 2.7 volt "full" level?  I have to look back over my experiments with these b-caps to see if I ever did that...I don't remember.  I will check but I am pretty sure I have charged my 2.7 volt 650 F b-cap with a nine volt bat. at least once.  You do NOT want to over fill one of these, that would be dangerous.

Bill

I know these are are different beasts then the regular caps but the voltage indicated is usually the working voltage. You do not want to charge them with a voltage that is higher. I would think that charging these with the JT may reduce the life expectancy of the cap. You are sending the cap voltage spikes from the JT that may eventually break down the cap. I keep saying "May" because I am not totally sure. Even though you are charging it with high voltage spikes, the current in these spikes are relatively small so the overall result is