Joule Thief

[freepow]

@ Anyone that can help,

In this diagram of my charge circuit I have 2.140v after the red LED charging light, then going into the
55 F supercap through the diode, I have 1.927v charging cap.
I have 2.128v going to the green LED.

I have tried to put a diode also feeding in to the green LED, so the green LED will be getting the same volts
as the cap, but when I added the extra diode, the green LED would not work anymore, why ?

Is there another way to have the same volts going into the green LED (1.927v) as the cap is getting (1.927 v) ?
Without taking the cap diode out, otherwise the cap will leak into the green LED and I dont want that !

[kb24]

KB here is a schematic of the circuit

Any cap you add should help a little........although  a good sized cap  is best

gary

But if i use larger caps, will it be possibility that the led wouldnt turn on due to voltage not enough to pass through large caps?

[crowclaw]

@ Anyone that can help,

In this diagram of my charge circuit I have 2.140v after the red LED charging light, then going into the
55 F supercap through the diode, I have 1.927v charging cap.
I have 2.128v going to the green LED.

I have tried to put a diode also feeding in to the green LED, so the green LED will be getting the same volts
as the cap, but when I added the extra diode, the green LED would not work anymore, why ?

Is there another way to have the same volts going into the green LED (1.927v) as the cap is getting (1.927 v) ?
Without taking the cap diode out, otherwise the cap will leak into the green LED and I dont want that !

Hi Freepow,
I'll take a look for you. One point though!! you can't have two different voltages at points which are connected together though? just re_check your circuit again. The green LED's anode needs to be on the source side of the charge circuit i.e. on the anode side of the red LED. I take it the red LED is extinguished when the super cap is charged up, and you want the Green led lit to indicate same. What voltage is your power source into your circuit. Just check these points first for me and I'll redesign the charge circuit for you. Can you also if possible provide the charge current through the diode to supper cap if possible. Don't worrry if not. Regards

[Pirate88179]

But if i use larger caps, will it be possibility that the led wouldnt turn on due to voltage not enough to pass through large caps?

I was only able to really light a lot of leds from my EB once I began using very large supercaps.  I simply put them in parallel with the JT and the EB.  My original EB would only light a red led and from that, I was able to power a Fuji JT to light a 48" tube and later, 400 leds once i used supercaps.  This was a great suggestion given to you.  I know it will work.

Bill

[guruji]

Hi Gadgetmall how are you? Nice hearing from you. Thanks for sharing your circuits. Wish you health and happiness.
If you can see this video it might be helpful:
http://www.youtube.com/watch?v=pEGKT6UqzFs