25mV Joule Thief powered by peltier merely using our body heat -Free energy 24/7

[conradelektro]

Hi conradelektro,

Interesting oscillator circuit using ALD mosfet.

I was curious about the efficiency for the ALD based circuit.
Using :200mV x 250uA (Found in uploaded image)

I used VoltsxI(Amps) =0.2v x 0.00025A =0.00005 watts or 50mW (Current consumption to light led)

I then try to apply for my 2SK170 circuit VxI =60mV x4.2mA=0.00000252 watts or 2.52mW(Current consumption to light led)

But i noticed my circuit current draw is higher for lower voltage requirement although efficiency wise the 2SK170 base circuit looks better.
Maybe it make sense why ALD mosfet is preferred choice for  radio.

These are my calculations:

circuit with 2SK170: 60 mV and 4.2 mA --> 0.06 x 0.0042 = 0,000252 = 252µW (LED is fairly bright)

circuit with ALD110900: 200 mV and 250µA --> 0,2 x 0.000250 = 0,00005 = 50 µW (LED just glows)

My simple earth battery delivers about 1.2 mA short circuit current, which would be too little for the 2SK170 circuit, even at 60 mV.

I just measured the ALD110900 circuit at my earth battery again (0.5 meter copper and aluminium tube next to each other in the ground): 0.53 Volt and 540 µA --> 280 µW.

It just happens that the ALD110900 circuit is perfect for my simple earth battery because the earth battery delivers up to 0.9 Volt but very little current.

For other applications, like a Peltier Element, the 2SK170 circuit is better, because a Peltier Element delivers quite some current even while its Voltage stays low (below 100 mV). At 200 mV the 2SK170 circuit draws already too much power (about 14 mA).

Here my measurements of the two circuits:

2SK170 circuit:  50 mV -- 2.2 mA , 100 mV -- 6 mA , 200 mV -- 14 mA , 500 mV -- 34 mA (I would say, above 200 mV the circuit is not useful any more.)

ALD110900 circuit: 180 mV -- 200 µA , 200 mV -- 250 µA , 1 V -- 1.2 mA ,  1.5 V  -- 1.25 mA (I would say, between 200 mV and 1.5 V the circuit is useful in case one wants a very limited current draw. Of course, the LED is never very bright.)

Greetings, Conrad

[magpwr]

hi everyone,

My experiment using copper tube with 7 toroid wrap around it was a failure using 2SK170 with toroid 4:100 using peltier as power source.

However if i try connecting (copper tubes toroid) in series with same(100:4) toroid at pri 4 turns powered by 1.5 battery instead of peltier it works.I was able to light 10mm led quite brightly if i tap power source from within the copper tubes using a straight 18AWG.The led only lit one way only.

Using 2n4401 or 2n22222 transistor instead of 2SK170 if i'm using 1.5v battery.

Latest finding-Please taken note the copper tube/ferrite combination only works well in "high frequency".

[jp08]

is JT can boost the voltage to 5V-12V with high output current w/c will charge the ultracapacitor quickly using  TEG(1.65V @ 16A)

[conradelektro]

Now J.L. Naudin does some experiments with this strange "transformer" (many toroids on a copper tube):

http://jnaudin.free.fr/dlenz/indexen.htm  (the video shows schematics of the test circuit)

http://jnaudin.free.fr/dlenz/DLE01en.htm (also shows the schematics and construction details)

My own tests just showed that a lot of current is necessary to light a few LEDs; more power than lighting the LEDs directly.

I do not understand what Naudin sees in his experiment? It is an interesting "transformer", but to light a 10 Watt lamp with 80 Watt input is not very efficient.

A dynamic system can easily show less power draw under load as long as the input exceeds the output by a huge factor. The impedance (dynamic resistance) of a system changes when the magnetic properties change. And putting a load on this "transformer" will change its magnetic properties.

But there might be something I do not understand, could someone explain the expectations people have in connection with this "transformer"?

Greetings, Conrad

[DreamThinkBuild]

Hi Conrad,

I just seen these heat pads that work off 5vdc, 600ma.

5x10cm
https://www.sparkfun.com/products/11288

5x15cm
https://www.sparkfun.com/products/11289

Video:
http://youtu.be/WdNAQIR5iSI?t=10s

Wonder if you could insulate/sandwich it with a high R value on one side of the peltier cell and pulse it with 5-12vdc to maintain the temp.

Well, back to shoveling, got about 33" of snow.

The shed failed, at least the furnace didn't get damaged.