Joule Thief

[kb24]

@kb

I had a second look at your jt schematics , you have no resistor on it ?

You will need to be more careful about tuning your jt , try using a 1 k pot , and look into the resonant tank circuit idea by  Gadgetmall , you will need it .

I presume you have a multimeter and set the amp draw to the lowest by adjusting the resistance value to the lowest amp draw vs light .

Mark

And btw i am really not kidding , having leds work doesn't mean it is well connected , in the video i posted i assemble the circuit and show that the led will light even if the circuit is not connected properly ... I am here to help not to pass judgment or saying you did something wrong but there is more to it then meet the eye .

http://www.youtube.com/user/abramrk1#p/u/6/eiLcbTBewhw

Thanks Mark, and dont worry, i come here to learn since i really have zero knowledge in electronics. So every reply at here, i take it as input for me to improve myself. Thanks.

For resistor part, may i know the function of resistor at there and why i should have it? I remove it because i thought it will reduce my EB power.

Thanks for providing me the video for reference.

@kb24

Well , even if you got leds working it doesn't mean automatically that its connected properly , you said 5 leds is that all you got or all that works ?

Second , have tried to run it on a charged cap , you need i minimum of voltage in the capacitor , this is why you charge it slowly in the days time to use at night .

I actually not understand how to charge cap. I try to google and search on how to charge a capacitor actually, mostly is tutorial on charging capacitor for audio amp.

I use single AA battery to light up 5 LED. I test the AA batery to light up 1 LED, but it cant. With JT i can light up 5LED. So does it consider my JT work?

Lot of question here Thanks

[kb24]

First, I have never tried lighting a cfl from my EB...it probably could but I like the tubes and leds much better than messing with cfl's.

Second, the last time I checked it, and it has been a while, the EB was outputting just under 2 volts at about 19 mA's.  I hope this helps.

Bill

Wow, 19mA is impressive. Thanks for the information.

[kb24]

I think i start to understand bout capacitor.. i try connect caps(35V 220uF) directly to 9v battery for few minutes then i remove and connect parallel with my EB. I notice that my LED light boost up for 1 second. So i think all my testing before on caps was due to my caps are not charged yet..

I think i cant charge up my caps if i link it parallel with my EB battery. My EB only produce 0.1mA which is too low to charge up caps. What u guys think?

[Pirate88179]

I think i start to understand bout capacitor.. i try connect caps(35V 220uF) directly to 9v battery for few minutes then i remove and connect parallel with my EB. I notice that my LED light boost up for 1 second. So i think all my testing before on caps was due to my caps are not charged yet..

I think i cant charge up my caps if i link it parallel with my EB battery. My EB only produce 0.1mA which is too low to charge up caps. What u guys think?

I think you are on the right track now.  The thing about caps and supercaps with the EB is that, my EB outputs very high spikes that my caps drink in and convert to usable power.

For example:  My large boost cap is 650 F at 2.7 volts.  Well, my EB outputs 1.9 volts give or take.  After a few hours, that cap was charged to the full 2.7 volts.  How can this be?  I asked myself this and then took scope shots of my EB and saw some very huge spikes.  So, unless I am wrong, I figured this was where the energy was coming form in my cap.

When we said charge your caps, I believe we meant to place them in parallel in the circuit and let your power source slowly charge them.  If you can do this without a load it will happen quicker but they will charge either way.

I hope this helps.

Bill

[kb24]

I think you are on the right track now.  The thing about caps and supercaps with the EB is that, my EB outputs very high spikes that my caps drink in and convert to usable power.

For example:  My large boost cap is 650 F at 2.7 volts.  Well, my EB outputs 1.9 volts give or take.  After a few hours, that cap was charged to the full 2.7 volts.  How can this be?  I asked myself this and then took scope shots of my EB and saw some very huge spikes.  So, unless I am wrong, I figured this was where the energy was coming form in my cap.

When we said charge your caps, I believe we meant to place them in parallel in the circuit and let your power source slowly charge them.  If you can do this without a load it will happen quicker but they will charge either way.

I hope this helps.

Bill

I think i start to get it. The larger the farad for each caps, the lower the voltage rite? So tats why u recommend me to use larger caps since it require less voltage to fully charge it.. Plz correct me if i am wrong.. thanks