Joule Thief

[erfandl]

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

[forest]

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.

[senna2]

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

[Tarsier_79]

No, If they are in series they divide capacitance, but multiply the voltage rating, parallel they add capacitance.

[erfandl]

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.