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Author Topic: 25mV Joule Thief powered by peltier merely using our body heat -Free energy 24/7  (Read 226843 times)

Offline magpwr

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I 've got my 2sk170 , Thx magpwr for this wonderful circuit , thanks to u guys  too for helping

hi omdano,

Don't forget to post a photo of your completed circuit  with led lit once you get it running. :)

Cheers.

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Offline omdano

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I am going to make you more than that , Just wait for april .

Edit :

One question
if i had 2 peltiers , each producing 100mV , i want to put them in series to produce 200mV
won't the second peltier just suck up the voltage and turn it into heat ?
« Last Edit: February 23, 2014, 10:51:02 PM by omdano »

Offline conradelektro

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I am going to make you more than that , Just wait for april .

Edit :

One question
if i had 2 peltiers , each producing 100mV , i want to put them in series to produce 200mV
won't the second peltier just suck up the voltage and turn it into heat ?

My opinion:

It is fine to put Peltier elements in series (in order to have higher Voltage). But the current can not be more than the current from the weaker element. The elements will give the same current if they have the same temperature and the same temperature gradient (between the hot and cold side) and if they have the same size and make.

If one puts Peltier elements in parallel (in order to have more current) they should have roughly the same temperature and the same temperature gradient  (between the hot and cold side), also same size and same make.

Simply said: if you use more than one Peltier element (either parallel or in series) make sure they have the same conditions on their hot and on their cold side (of course the hot side is hotter than the cold side). This might not be easy to achieve. A smaller Peltier element will heat up faster than a bigger element. Different brands will have a different heat conduction.

If you want to keep it simple, use just one element. Peltier elements are available in different sizes (it soon becomes expensive, 50 x 50 millimetre elements are already expensive). I found that 30 x 30 mm or smaller Peltier elements are pretty useless at low temperature differences.

Peltier elements become usefull if a temperature difference of 200° (centigrades) is available, which implies very good cooling on the cold side. Getting the heat on the hot side is fairly easy (open flame), but the cooling on the cold side is difficult (in practical terms). Usually some water cooling is arranged.

Peltier elements are ususally used as sensors (providing very little power) and not as a generator (providing useful power).

Peltier elements are in general not a very useful power generator technology on earth. But in space the sing, because the cold side is simply exposed to space (near absolut zero) and on the hot side is usually a nuclear reaction providing heat for years. You do not want a nuclear reaction near you and you do not have absolut zero near you.

Greetings, Conrad

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Offline TinselKoala

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Yes, you should be able to put Peltiers in series, just like any other DC source.

(oops, just saw Conrad's post, same thing)

Offline omdano

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So... did anybody try to Oscilloscope the output of this circuit ? (with any voltage input - please mention)

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Offline TinselKoala

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Well, I don't have a 2sk170 but I've certainly posted plenty of JT scope traces. And LTseung has a thread that is mostly discussion of scopetraces from his JTs.

Offline omdano

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Well, I don't have a 2sk170 but I've certainly posted plenty of JT scope traces. And LTseung has a thread that is mostly discussion of scopetraces from his JTs.

Yeah because .. i would love write an equation for the JT circuits inputs and outputs
to make things simpler .

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Offline TinselKoala

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Good luck!

Actually the JT is a type of blocking oscillator and these have had equations written for them in plenty.

Here you go, calculate away to your heart's content.

http://www3.alcatel-lucent.com/bstj/vol38-1959/articles/bstj38-3-785.pdf

Here's a good overview of transistor blocking oscillator operation, but without the equations:

http://mysite.du.edu/~etuttle/electron/elect37.htm

So the JT is really a blocking oscillator with components chosen so that it will operate at low input voltages.

Offline omdano

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is there an easier way for winding the 100 windings ? XD

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Offline TinselKoala

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Are you winding toroids? Yes, there is.

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

Offline omdano

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Well ..  so..  How did u measure the voltage in the video ?
People usually use Oscilloscope but you just simply used a multimeter
Where did u connect the multimeter ?
(the output circuit voltage)

Free Energy | searching for free energy and discussing free energy


Offline TinselKoala

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Well ..  so..  How did u measure the voltage in the video ?
People usually use Oscilloscope but you just simply used a multimeter
Where did u connect the multimeter ?
(the output circuit voltage)

Did I link to the wrong video? Sorry, the video I intended to link to was just showing how to use a spindle bobbin to wind the toroid easily.

What video did you actually watch? There was no multimeter shown measuring anything in the video I "thought" I linked to -- and which still appears to be the one in the link.

If you want to see some measurements on a scope, why didn't you say so? You asked about how to make it easier to wind 100 turns on a toroid, I thought.

Here are some scope measurements of  JTs.
http://www.youtube.com/watch?v=6zFOhTU-bt0
(For some reason I say "50 milli Ohms" when I meant to say "50 milliAMPs" a couple of times when talking about the Current trace on the scope. Sorry about the confusion...)
http://www.youtube.com/watch?v=nqJPi35cRrE
http://www.youtube.com/watch?v=uLEyv2jbWrU
http://www.youtube.com/watch?v=9MxIXESkS3I
http://www.youtube.com/watch?v=KWDfrzBIxoQ

Offline scratchrobot

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So... did anybody try to Oscilloscope the output of this circuit ? (with any voltage input - please mention)


http://www.youtube.com/watch?v=dR3wQf7xqNM

Offline omdano

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lol
@TinselKoala
i should have tagged magpwr

i was talking about his main video in the OP

Offline magpwr

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Well ..  so..  How did u measure the voltage in the video ?
People usually use Oscilloscope but you just simply used a multimeter
Where did u connect the multimeter ?
(the output circuit voltage)

hi omdano,

There is no need for Oscilloscope since we are working with DC.

You will need to the "fix" hot or side for the peltier(which effect which wire from peltier produce + or -) since you are going to connect to 100uf or 1000uf capacitor at the input of joule thief(+ -).

The peltier (+ -) output is connected to multimeter and joule thief output is connected to multimeter in video.This is just for demonstration purpose.

This joule thief circuit can be completed in few hours since 100 winding for toroid will take some time."Need alot of patience" :D

That's all the advise i can give."Good Luck"

 

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