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Author Topic: Joule Thief  (Read 5815798 times)

Offline erfandl

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Re: Joule Thief
« Reply #16920 on: February 14, 2022, 05:45:26 PM »
Can you mark on schematic direction of winding coils ? I see there is no 100k resistor on schematic, can you post correct schematic ?
Hi. the coil directions is clockwise. This circuit works well when you only use germanium diodes
the 100K variable resistor is only for tunning the light output/power usage


Offline forest

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Re: Joule Thief
« Reply #16921 on: February 15, 2022, 08:44:45 PM »
erfandl


Thank You for information. About secondary 400 turns : did you isolate each layer ?
did the circuit worked good at once or it needed adjustment and what kind of ?
What kind of battery you use ?


Please give us as much information as possible to replicate this circuit.


Offline senna2

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Re: Joule Thief
« Reply #16922 on: February 16, 2022, 08:25:10 AM »
Hi.
1- it's 35V 10000uF
2- two 100v .0001uF capacitor in parallel
3- 100k variable resistor

Erfandl,

Much appreciated!  Thank you for the kind explanation!
in #2, the schematic drawing only shows one .0001uF cap. If another identical cap is connected parallel to the first one, the capacitance value would be .00005uF at 100V.
Correct?  Thanks again for your assistance :)

Pablo

Offline Tarsier_79

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Re: Joule Thief
« Reply #16923 on: February 16, 2022, 11:28:13 AM »
No, If they are in series they divide capacitance, but multiply the voltage rating, parallel they add capacitance.

Offline erfandl

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Re: Joule Thief
« Reply #16924 on: February 16, 2022, 11:48:07 AM »
erfandl


Thank You for information. About secondary 400 turns : did you isolate each layer ?
did the circuit worked good at once or it needed adjustment and what kind of ?
What kind of battery you use ?


Please give us as much information as possible to replicate this circuit.
your welcome. yes the layers is isolated by the paper paste.
To get best result, you have to play with the secondary coil turns ( I got good result with 20 turns ).
The batteries are NI-MH.

Offline forest

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Re: Joule Thief
« Reply #16925 on: February 16, 2022, 09:01:17 PM »
Each layer isolated by paper paste ?


Do you have more pictures of actual device?

Offline senna2

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Re: Joule Thief
« Reply #16926 on: February 17, 2022, 12:39:45 AM »
No, If they are in series they divide capacitance, but multiply the voltage rating, parallel they add capacitance.

Thank you for the correction. I realized that I momentarilly got confused about capacitance between serial and parallel. Logged in to fix the question, but you already reponded 👍🏼🙏🏼

Offline erfandl

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Re: Joule Thief
« Reply #16927 on: February 17, 2022, 10:18:40 AM »
Each layer isolated by paper paste ?


Do you have more pictures of actual device?
sorry I mean paper tape like this:


Offline senna2

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Re: Joule Thief
« Reply #16928 on: February 18, 2022, 02:27:07 AM »
your welcome. yes the layers is isolated by the paper paste.
To get best result, you have to play with the secondary coil turns ( I got good result with 20 turns ).
The batteries are NI-MH.

Hi the wires used for primary and secondary are the same 30awg? or 20 awg for the primary and 20 awg for the secondary?
Thank you! :)

Pablo

Offline sergeyman

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Re: Joule Thief
« Reply #16929 on: February 18, 2022, 07:58:50 PM »
I'm looking for a Joule Thief that can work after the battery is disconnected, anyone know such schematic?

Offline forest

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Re: Joule Thief
« Reply #16930 on: February 19, 2022, 09:25:26 PM »
What is printed on ferrite core ? How is it marked?

Offline forest

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Re: Joule Thief
« Reply #16931 on: February 23, 2022, 06:10:18 PM »
Is it still running ?  I have found similar ferrite core and will start experimenting

Offline forest

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Re: Joule Thief
« Reply #16932 on: February 28, 2022, 04:36:22 PM »
erfandl




Both winding are in the same direction  ? I tried to simulate circuit in LTSpice and there is no output in such case. Strange

Offline erfandl

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Re: Joule Thief
« Reply #16933 on: March 01, 2022, 09:45:55 AM »
erfandl




Both winding are in the same direction  ? I tried to simulate circuit in LTSpice and there is no output in such case. Strange
yeah both are in the same direction. change wiring sides to get working.

Offline erfandl

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Re: Joule Thief
« Reply #16934 on: March 14, 2022, 09:40:36 AM »
New build with filament LED and ultra low power input.
Starting voltage: 3.722
voltage after 24 hours: 3.721