Joule Thief

[Artic_Knight]

Hey guys,

Ive been thinking lately, if a JT is good at using up all the energy in a battery for say, a LED torch. Can a JT be used in a device that uses a lot more power, say, a electric scooter? like this one http://www.bestscooterbuys.com/evo800.html (I own two of these!! great fun!!)

a joule theif could be used for that application but the joule is a blocking oscilator so you would need a diode blocking the path through the motor and that diode would need to "switch on" at the appropriate voltage you want the motor to run at so since you have a 36v power supply im guessing it runs on 36v but you would want to use a volt meter and be sure. as far as needing to scale up you could still run this from a 1v power supply but it would draw more MA than the leds. you just need the proper resistors and transistors for the given voltage and amps or "wattage" your using. also the magnetic torroid would not need to be very big, it only needs to be big enough to avoid saturation. i could not tell you how to calculate the saturation that may require experimentation but i would imagine these gold mines everyone orders are probobly big enough.

there is only so much gains that can come from this system however. if you have noticed in this forum there is a "max voltage" these units can accomplish. the only way to raise the voltage after a sertain point is to increase amp draw. that max voltage comes from the magnetism itself. see magnetism is wattage based (volt x amp) and it can only be streatched so far before you reach the limit of a given wattage. since motors are magnetism driven you are going to lose torque as you lose magnetism. the motor may not be making effecient use of this magnetism or the power to create it and so this circuit may help give it a more effecient drive as people have employed pulse width modulation for motor speed controls for some time now to make them more efficient. however if the motor doesnt have the magnetism it needs when it needs it then again you will lose torque or horse power.

you should try it, could be very fun and a good learning experience. just use a cheep motor for testing

[kooler]

heres a follow up to my last jt train..
i forgot to show the filter caps and how it works

http://www.youtube.com/watch?v=g7ALFBFonns

robbie

[osiris]

hello all

i was thinking of building something agin...

i saw the bcaps were on for a christmas discount so i bought some ...


peace  lartz pics oo so soon
osiris
for the reunion a song ... 
WHOA IS ME http://www.youtube.com/watch?v=71S9ou2gcqE
ps 10kw unit 

[kooler]

hello all

i was thinking of building something agin...

i saw the bcaps were on for a christmas discount so i bought some ...


peace  lartz pics oo so soon
osiris
for the reunion a song ... 
WHOA IS ME http://www.youtube.com/watch?v=71S9ou2gcqE
ps 10kw unit 

hmmmm..
do we know you from a different username ??
weird..


robbie

[crowclaw]

hmmmm..
do we know you from a different username ??
weird..


robbie

I think so too robbie...very familiar, Hmmmmm.