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Author Topic: Second Stage Joule Thief Circuits  (Read 445687 times)

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #615 on: April 06, 2010, 10:19:41 PM »
let's go gadgetMan let's go

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

------------------------------

This is what I have from start :

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #616 on: April 06, 2010, 10:40:56 PM »
Now for next step circuit.
I need to find parts (from what I have) (transistors , zinner diod) for most efficiency.
JTs coils + secondaries - on the next.

« Last Edit: April 07, 2010, 03:24:35 AM by tysb3 »

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #617 on: April 07, 2010, 02:54:19 AM »
Just what comes to my mind: capacitor C2 was dumping feedback pulses power.
Need to check it.

---------------------

edited:
lucky, I don't break experiment, just remove C2. Frequency feedback pulse was dropped twice to 0.1Hz (1 pulse in 10 seconds)
Second JT was feeding first JT through C2.
I'll keep it ower night to see how mach will be dropped voltage, to compare with previous nights.
« Last Edit: April 07, 2010, 05:55:22 AM by tysb3 »

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #618 on: April 10, 2010, 08:53:44 PM »
Hi,  @all,
Just completed my first experiment. What I found: battery voltage much depends on the temperature.

Offline Mk1

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Re: Second Stage Joule Thief Circuits
« Reply #619 on: April 10, 2010, 09:01:37 PM »
@tysb3

Nice work ! keep it up .

I am planing a second stage also with my NPN PNP circuit , second stage powered by 2 jt ...

Mark

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #620 on: April 11, 2010, 08:46:50 PM »
thanks, Mark.

@ all
Now I'm playing with parts of  double JT
Just connect mosfet. It's working !
« Last Edit: April 12, 2010, 03:17:59 AM by tysb3 »

Offline guruji

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    • http://andyborg.tripod.com
Re: Second Stage Joule Thief Circuits
« Reply #621 on: April 12, 2010, 01:27:54 PM »
Hi tysb what are you using on Q1 transistor?
Thanks

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #622 on: April 12, 2010, 03:22:46 PM »
Hi guruji,
Now I'm keeping C5029
but I think, small power transistor is better.
Should be work any npn  transistor, only need to find which works more efficient.

Offline guruji

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Re: Second Stage Joule Thief Circuits
« Reply #623 on: April 12, 2010, 08:07:54 PM »
Hi tysb thanks so this charges the source batt? and where one puts leds with this circuit?
Thanks

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #624 on: April 12, 2010, 08:51:11 PM »
Hi tysb thanks so this charges the source batt?

Hi guruji
I hope it will charge. Now it's only feedback. I dont have Ammetter.
Now what I have - source batt voltage drops from 1.393 to 1.390 in 24 hours.
If you want to play with LEDs, you can its connect where you want, like ordinary JT - transistors collectors, or wind secondaries coils

@ all some project
« Last Edit: April 13, 2010, 01:27:50 AM by tysb3 »

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #625 on: April 13, 2010, 09:20:34 PM »
Hi
@ all

I replace IRF630 to IRF614.
Looks much better.
The pulses package is now almost twice as long.

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #626 on: April 17, 2010, 03:18:01 AM »
Hi,
@ all

This is some video:   http://www.youtube.com/watch?v=01kHpPcjPDI

You can hear sound when feedback pulses package is going
First JTs curent is about 0.5 ma

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #627 on: April 18, 2010, 05:57:47 AM »
Hi
@ all

I blow up my mofsets :(
and return to bipolar transistors.
It's looks working in similar efficiency with high resistens R2
Pulses package is shorter.
T2 parameters is critical. I try to wind JT coils to T2 - unsuccessful with this circuit parameters.
Looks need more inductance in the coils maybe  ???

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #628 on: April 20, 2010, 03:38:26 AM »
Hi
@ all

Some photos, some video

http://www.youtube.com/watch?v=n7g9Wq0f03o

Offline tysb3

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Re: Second Stage Joule Thief Circuits
« Reply #629 on: April 23, 2010, 04:54:51 AM »
Hi
@ all

It's still not OU,
but maybe we are closer

http://www.youtube.com/watch?v=KV_DWJ7CB44

Now I have allegations about... triple    .........


« Last Edit: April 23, 2010, 05:54:50 AM by tysb3 »