Joule Thief

[gadgetmall]

Deleted double post ( how did that happen ?)
Gadget

[jadaro2600]

@ jadaro2600

The ampmeter goes in series with the battery as in following. Transistor was actually 2N3739 (it is wrong in diagram) but any transistor should work. Battery current can be adjusted by varying the base resistor value.

Thank you, it's been a real test to try and get a diagram out of 316 pages of forum posts.  And, it seems as though the circuit is using almost nothing.

I posted to following on another thread and though it might have relevance here:

Thankyou all for your replies..

I've looked into the youtube video ..perhaps we're thinking along the same lines; or maybe not.  the jtc looks a bit strange, but i'm a newbie.

I'm attempting to create an equivalent brightness using AC as would be with DC but using less over all power.

Intrinsically, generating AC will have it's drawbacks, or losses involved. etc.  I've read that a diode will act as a capacitor given a reversal of normal current flow, but in reversal situations there is heat dissipated.  Heat = loss of usable electricity.

I was thinking about half the current would due if a LED could be set into a resonant mode.  The circumstances being right ..a resonant LED wouldn't overheat and the eyes would smooth out the frequency... and hopefully not cause seizures.

Given the right forward current and perhaps a reverse current less than that of the forward current and the LED could be brought to resonance.

TK - indeed, 30ma is enough to blind someone using the right kind of LED; i think 20ma is sufficient - especially for green LEDs.

..I would try not to mention the JT circuit over the phone, just say the name out loud and you sound like a criminal.  "Yea, i've been working on the JTC".  Word of warning. LOL  is this one of those slammers, where they fly in with the helicopters?

Bill

Thanks for the  link.

I found  a few other things on that site that  I have been  looking for .



I saw that  they  have  super caps there.
Do you know if super caps can  be put in series  to get  a higher effective  voltage? 

gary

Putting your capacitors in series will actually cut the effective capacitance in half, don't know about the voltage, but it stands to reason - if there are two - If i'm fully aware of the capacitors' function at least.

You would actually just use the joule thief itself to increase the voltage.  Connect capacitors in parallel.

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I still don't understand how to measure the current being used! ..I've tried measuring across from the positive terminal of the battery to where it attaches to the board and i get no reading.  I've measured across the resistor and get .6 microamps (ua) with similar results for measuring across the coil connected in series with the resistor.

[gadgetmall]

Thank you, it's been a real test to try and get a diagram out of 316 pages of forum posts.  And, it seems as though the circuit is using almost nothing.

I posted to following on another thread and though it might have relevance here:
Putting your capacitors in series will actually cut the effective capacitance in half, don't know about the voltage, but it stands to reason - if there are two - If i'm fully aware of the capacitors' function at least.

You would actually just use the joule thief itself to increase the voltage.  Connect capacitors in parallel.

- - - - - - - - - - -

I still don't understand how to measure the current being used! ..I've tried measuring across from the positive terminal of the battery to where it attaches to the board and i get no reading.  I've measured across the resistor and get .6 microamps (ua) with similar results for measuring across the coil connected in series with the resistor.

Hi TO MEASURE YOUR CURRENT DRAW > PUT YOUR AMPMETER IN SERIES WITH THE BATTERY . . Simply remove the battery hook you positive from the battery to you circuit then with the negitive put one lead of you meter on the negitive of the battery and complete the circuit to you device with the other lead of your dmm.

[resonanceman]

I got three of these . They put out voltage but wont light a clf yet . Lets work on em and other camera circuits like poloroid too . I also got a couple of those little Hv modules they hand . They WILL work down to 1 volt and put out a great deal of power . I also will try to modify this one as it looks very dependable
Gadget

Gadget

I am planning  on getting  a few of them .

If I am right  about a JT being  able to  be used  in place of the  pulser motor  one of  these  boards should  do the job .......   Not  sure how many  batterys  it will charge .........but ........that is  what experimenting is about


gary

[jadaro2600]

Ok, so it's using 22ma or so.  No surprises there.  Apparently a fuse had blown in my ammeter.