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

[magpwr]

Hi scratchrobot,

I would like to check with you only 3 things to find out why circuit isn't working for you.

1)Are you using the most ideal N Channel Juntion FET-2SK170 (1 or 4 should work as well).I have not mentioned in video.Please don't bother trying with other N-Channel JFets(>30 varieties ) the result isn't good (not as low startup/osc)or worst don't even osc at 100mV or can't simply handle low impedance at primary(4 turns).

2)Is your primary (4 TURNS) and Secondary is around 80...100(Even 70 turns do work on smaller toroid,but open circuit voltage would be lower,with 10mm led voltage remains same around 2.3v ...2.4v)
May need to swap secondary turns ( One of the 2 output to positive)

3)Have you verifed the output voltage from peltier(+ - output with hand on itand heatsink) before even connecting to circuit.Please google datasheet of N-Channel J-FET to identify pinout(Drain ,Gate ,Source = C ,B ,E)Lastly peltier in itself(not with hand or on heatsink) ,out of the box should have low impedance reading <5Ohms.
   My peltier is 3Ohms .My toroid primary is <1Ohms with 4 turns.I think in theory peltier which got lower impedance may produce good result.


Lastly you could check toroid connection merely using common NPN transistor with 1.5V battery if there is no output just swap secondary (one of the 2 wires to + and primary one of 2 wire to +)
 
Have a Happy New Year.

[magpwr]

Hi scratchrobot,

I would like to check with you only 3 things to find out why circuit isn't working for you.

1)Are you using the most ideal N Channel Juntion FET-2SK170 (1 or 4 should work as well).I have not mentioned in video.Please don't bother trying with other N-Channel JFets(>30 varieties ) the result isn't good (not as low startup/osc)or worst don't even osc at 100mV or can't simply handle low impedance at primary(4 turns).

2)Is your primary (4 TURNS) and Secondary is around 80...100(Even 70 turns do work on smaller toroid,but open circuit voltage would be lower,with 10mm led voltage remains same around 2.3v ...2.4v)
May need to swap secondary turns ( One of the 2 output to positive)

3)Have you verifed the output voltage from peltier(+ - output with hand on itand heatsink) before even connecting to circuit.Please google datasheet of N-Channel J-FET to identify pinout(Drain ,Gate ,Source = C ,B ,E)Lastly peltier in itself(not with hand or on heatsink) ,out of the box should have low impedance reading <5Ohms.
   My peltier is 3Ohms .My toroid primary is <1Ohms with 4 turns.I think in theory peltier which got lower impedance may produce good result.


Lastly you could check toroid connection merely using common NPN transistor with 1.5V battery if there is no output just swap secondary (one of the 2 wires to + or swap primary one of 2 wire to +).
If works then use JFET with lower voltage or ultra cap eg:50F 2.5v charged using 1AA for 1..3 seconds to get around 100mV,if you are not using peltier to test.Since Ultra caps eg:20F...50F got very low impedance as well.
 
Have a Happy New Year.

[scratchrobot]

Hi scratchrobot,

I would like to check with you only 3 things to find out why circuit isn't working for you.

1)Are you using the most ideal N Channel Juntion  (1 or 4 should work as well).I have not mentioned in video.Please don't bother trying with other N-Channel JFets(>30 varieties ) the result isn't good (not as low startup/osc)or worst don't even osc at 100mV or can't simply handle low impedance at primary(4 turns).

2)Is your primary (4 TURNS) and Secondary is around 80...100(Even 70 turns do work on smaller toroid,but open circuit voltage would be lower,with 10mm led voltage remains same around 2.3v ...2.4v)
May need to swap secondary turns ( One of the 2 output to positive)

3)Have you verifed the output voltage from peltier(+ - output with hand on itand heatsink) before even connecting to circuit.Please google datasheet of N-Channel J-FET to identify pinout(Drain ,Gate ,Source = C ,B ,E)Lastly peltier in itself(not with hand or on heatsink) ,out of the box should have low impedance reading <5Ohms.
   My peltier is 3Ohms .My toroid primary is <1Ohms with 4 turns.I think in theory peltier which got lower impedance may produce good result.


Lastly you could check toroid connection merely using common NPN transistor with 1.5V battery if there is no output just swap secondary (one of the 2 wires to + and primary one of 2 wire to +)
 
Have a Happy New Year.

Hi Magpwr,

My mosfet's are J175 so maybe they are not the one's you used and they are the reason the circuit isn't working for me.
My peltier without heatsink reads 5 ohms without a heatsink and with heatsink and one finger gives 25mv easely.
I will try with normal transistor to see if i can get it to work.

Thanks and happy new year to you too.

[magpwr]

Hi Scratchrobot,

I'm sorry you had to find out the hard way.I did mentioned somehwhere in youtube description or comment to another interested person whom wish to construct the ultra low voltage circuit.
Never to try any Jxxx series all those don't work.I have done stimulation testing using trial software to find out the best component(It's on you to find out.I won't reveal it).
Please don't bother trying other Junction FETs you won't get ultra low self startup voltage.I have wasted 3 days to accidently discover a self starting joule thief at below <30mV while trying to optimise joule Thief.

I bought 2SK170 from  http://www.futurlec.com  (After searching in internet high and low) for $0.20ea (Bought 10 pieces for $2 USD) Since i'm living in Asia shipment is only around $5.50USD for me.Got it within  2 weeks.

Recent discovery my circuit could be powered by solar cell in room merely shine a led torchlight to part of the 1.7v solar cell(400mA) to light a led again from my ultra low joule thief(NOT OVERUNITY).

[conradelektro]

I am still waiting for delivery of some 2SK170 transistors. But I tested magpwr's circuit with transistors I had (see attached circuit diagram and photo, photo shows test with a BC547B).

2N3904 : self starts to oscillate at 0.52 Volt  and can then be turned down to 0.17 Volt

2N4401 : self starts to oscillate at 0.5 Volt  and can then be turned down to 0.1 Volt

BC574B : self starts to oscillate at 0.49 Volt  and can then be turned down to 0.14 Volt

I also tried with 10 turns for the collector coil, but 4 turns worked better (same self start voltages, but with 4 turns the LED showed some light with less supply Voltage). 4 and 100 turns seems to be a good ratio for the coils.

The 1 µF capacitor over the LED had no effect (also tried other values like 100 nF).

The resistor at the base influences power consumption very much. With 1 K the power consumption at 0.5 Volt was around 15 mA. With 10 K it was too low to be measured reliably, less than 1 mA.

I have redrawn magpwrs's circuit to give it a more conventional look. The LED is driven by the negative halve of the base coil spike. The positive halve of the spike triggers the transistor.

So, it really seems to be the transistor which is the determining component. On Monday I should get the 2SK170 transistors.

Greetings, Conrad