Joule Thief

[Mk1]

@jeanna

Real nice, keep it up !

[electricme]

@ amigo,
Thanks for your post, I noted your concerns about it seems no one has been to take a look at the 2 postings you did on LED diodes.

I will put my hand up and say boldly, "I still have not been to take a look" so in a few minutes I will search back for those addresses and take a look.

In defence of my poor actions I will say, there is so much to catch up on here, that I have been side tracked, but it is not intensional, I simply have been distracted by many information going on in this thread, ALL of it is necessary to understand what every one is doing.

This further complicates matters also, I have noticed there have been posts I have made, and no one has passed a remark.
I simply understand at some time whoever reads something I have posted and it just may be the piece that person needed to get something working or not, but I will not worry if everyone has not looked, or passed a remark about it.

I aws up until late last night (past midnight), for several days, I awoke at 9.30AM, stoked up the PC and by 10.30 AM was on the forum checking posts overnight, it now 2.00PM and I have just finished reading them, some have been arriving as I have been on the forum. But this is the nature of this particular thread, it is so interresting that one gets hooked on it, so many interresting experiments are happenning, and all at the same time.

So don't feel dissapointed, we just carn't do everything at the same time, although I do share your concern about no-one has taken the time or effert to go and take a look.
I posted a http address on a web site late last night, that has excellent info that I think relates to this JT topic, I notice no one has remarked, thats OK, no worries, but at least I know about this site and perhapse I could jog peoples memories about it later on.

Amigo you have a lot of knowledge about electrical stuff, and I'm sure I speak for everyone here when I say, we appreceiate you and everything you have done so far, and look forward to many exciting times ahead with you.

I am stuck in a rut right now, things not going my way with my last JT torrid, I had great expectations, and feel let down now, soooooo I'm going to switch tactics, put my stuff away for a bit and read up on LEDS ha.


jim



   

[timmy1729]

@All

I think it was the other day that I said my big JT was getting 3.3vdc at 98mA(or around there). Well, tonight I took a bigger cap and replaced the one I had across the LED. It was a 10v  2200uF cap. This is the JT using my big toroid bifilar, Darlington transistor, 1k resistor, and germanium diode powering a high-brightness LED. Well, the voltage went up to 3.4vdc but then I checked the mA. From what I have seen with my JT's, when I get an increase in vdc, I get a decrease in mA. Well, my mA INCREASED to 169 mA dc 

That might not be really impressive, but with my limited tinkering with this stuff, I thought that was pretty cool! 

My "Wow, that's cool!" moment was when I removed the battery and the LED dimmed for about 5 seconds and then stayed a constant tiny glow. It was using a constant 2.2vdc at that point. My guess is that the battery charged the cap and when the battery was removed the LED kept glowing from the charge in the cap.

So, at least for this particular setup, increasing the cap across the LED from 50v  4.7uF to a bigger 10v  2200uF gave me 0.1vdc more and increased my mA by 70mA. I need to get some rechargeable batteries. Is there a possibility of feeding that current from the cap back into the battery?

[Mk1]

@timmy

Nice ! great work. More data, its all coming together nicely .

[xee2]

@ jeanna

Nice photo, thanks for posting it. Congratulations on your success. You make a good experimenter.