To browser these website, it's necessary to store cookies on your computer.
The cookies contain no personal information, they are required for program control.
  the storage of cookies while browsing this website, on Login and Register.

GDPR and DSGVO law

Storing Cookies (See : ) help us to bring you our services at . If you use this website and our services you declare yourself okay with using cookies .More Infos here:
If you do not agree with storing cookies, please LEAVE this website now. From the 25th of May 2018, every existing user has to accept the GDPR agreement at first login. If a user is unwilling to accept the GDPR, he should email us and request to erase his account. Many thanks for your understanding

User Menu

Google Search

Custom Search

Author Topic: JOULE THIEF with variable count of led  (Read 6686 times)

Offline basheer

  • Newbie
  • *
  • Posts: 2
JOULE THIEF with variable count of led
« on: December 19, 2012, 06:24:33 PM »
Hi all . ..
In the first I want to thank every one how was helped to make the JT
I made many JT : with one , tow . . . , 10 white led and now a don with 50 white led
Because I am not a professional in electric I do the flowing :
1- ferrite core 1 inch
2- transistor 547 NPN type
3- variable resistance ( for one led 1K)like the voice key of  the radio 
I use a variable Resistance (key voice ) to select the optimum light   ( from 3 led`s until to 50 led`s ) that main to me the optimum resistance   
But the led`s not  bright very well  , I connected  the led`s  on parallel , so when I but more led`s its go to decrease the light, when I but the led`s on serial it`s not work I don`t know WHY ?? I thing the problem in the on resistance, how I can get the optimum resistance ? and how I can get more bright?       
please can  help me ?
Thank for all
My regards
« Last Edit: December 19, 2012, 10:28:37 PM by basheer »