Joule Thief

[xee2]

it has more volts than that but that is what my meter showed

Very nice circuit. I also think that it takes more than 1200 volts to light xenon tube.  But a meter on AC is trying to read RMS voltage and most meters assume input is sine wave, which it is not in this case, so it will read low. It is easy to make a voltage divider with two resistors between 100K and 1M. But, I am sure you already know that.

Where did you get the C5855 transistors?

[kooler]

xee2
how are u ..
i got the transistor out of a crt monitor.. every crt has a big transistor in it and there all 1200 - 1700 volt range.. they will pulse that much volts but they wont hold that much as far as bemf..
but if you need some good hv transistors goldmine has some 1500 volt they are s2055 ..
http://www.goldmine-elec-products.com/prodinfo.asp?number=G4269

alot of these hv transistor also work at 1.2 volts..
i think i am going to buy a bunch. because a device i been working on has 6  13007 transistors paralleled to handle the voltage its pulsing.. cause when you pulse 400-500 volts it makes alot of bemf..

robbie

[freepow]

Hello Everyone !!!

I have a  Solar Panel which will go through a red LED then with a transistor and Zener diode, which will then charge my SuperCap.

Example if I set the charge voltage to 2.0 volts then as soon as the cap reaches near 2.0v then the current will drop to zero, so then no more charge will go into Cap,

But if I use 2x D batterys rated at 2.4v, how much charge voltage do I set the circuit to ?

If I need say 3.5~4v to fully charge the 2x D cells to 2.4v, the problem is the circuit wont stop the current charge untill the batterys reach 3.5~4v ?

How Do I get around this

[dasimpson]

as long as the panel dosent have a current rateing over 1c of the battery it wont overcharge
so say you have 2500mah battery the max current you wont the panel to give is 250maanything under is trickle charge

[xee2]

8 year blinking Joule thief >  http://www.youtube.com/watch?v=-l7L_u45edE

Note - a blinking LED is brighter than an always on LED when both use the same average power.