---
+ Post New Thread
Results 1 to 9 of 9
  1. #1
    Newbie level 5
    Points: 457, Level: 4

    Join Date
    Jun 2011
    Posts
    8
    Helped
    0 / 0
    Points
    457
    Level
    4

    Increase Voltage/Current using transistor

    hi all, I am absolutely new to learn electronics. I have been playing with LED's DC Motors and similar things found in toys during my childhood... but now i want to learn electronics for some basic use.

    I was searching to increase the voltage of a 1.5v battery... for example i want to light up an LED with just 1.5v AA battery... so i found it can be done with transistor easily... one thing that is confusing me is "Which transistor should i use and how ? or any transister would work ?"

    I have some C945 transistors... is it of some use in my problem.

  2. #2
    Super Moderator
    Points: 36,774, Level: 46
    Achievements:
    Created Album picturesCreated Blog entry7 years registered
    alexan_e's Avatar
    Join Date
    Mar 2008
    Location
    Greece
    Posts
    11,361
    Helped
    2037 / 2037
    Points
    36,774
    Level
    46
    Blog Entries
    6

    Re: Increase Voltage/Current using transistor

    I'm afraid it is not that simple , a boost (step-up) converted needs a complete circuit , a transistor can't do what you want
    Boost converter - Wikipedia, the free encyclopedia

    Alex



    •   Alt19th June 2011, 22:35

      advertising

        
       

  3. #3
    Advanced Member level 5
    Points: 37,620, Level: 47
    mister_rf's Avatar
    Join Date
    Feb 2008
    Location
    Romania
    Posts
    1,875
    Helped
    1040 / 1040
    Points
    37,620
    Level
    47

    Re: Increase Voltage/Current using transistor

    Yes, need to use ''the joule thief '', an electronic circuit that lights up a Light Emitting Diode using just a single AA battery
    Make a Joule thief.
    Joule Thief Single Cell LED Driver


    1 members found this post helpful.

    •   Alt20th June 2011, 00:33

      advertising

        
       

  4. #4
    Full Member level 2
    Points: 1,201, Level: 7

    Join Date
    May 2010
    Posts
    133
    Helped
    4 / 4
    Points
    1,201
    Level
    7

    Re: Increase Voltage/Current using transistor

    I can tell you the main function of the transistor.
    It can amplify the signal but with the power supply.
    generally the output signal can not go beyond the power supply.



    •   Alt20th June 2011, 01:14

      advertising

        
       

  5. #5
    Advanced Member level 5
    Points: 37,620, Level: 47
    mister_rf's Avatar
    Join Date
    Feb 2008
    Location
    Romania
    Posts
    1,875
    Helped
    1040 / 1040
    Points
    37,620
    Level
    47

    Re: Increase Voltage/Current using transistor

    It's true that a simple transistor fails to, but combined with a small coil, the assembly described as a ''Joule Thief'', will do the trick. Perhaps this is the idea that left the question.



  6. #6
    Newbie level 5
    Points: 457, Level: 4

    Join Date
    Jun 2011
    Posts
    8
    Helped
    0 / 0
    Points
    457
    Level
    4

    Re: Increase Voltage/Current using transistor

    Okay... I don't understand much about it till now... hope I would in near future... thanx everyone for guidance...

    please guide me to learn about Simple, Interesting and easy circuits...(LEDs, Motors, Fans, Speakers etc...) so that I can have some fun with them while learning...



  7. #7
    Advanced Member level 5
    Points: 37,620, Level: 47
    mister_rf's Avatar
    Join Date
    Feb 2008
    Location
    Romania
    Posts
    1,875
    Helped
    1040 / 1040
    Points
    37,620
    Level
    47

    Re: Increase Voltage/Current using transistor

    Did you read those links ?
    You have there all needed details how to build such a very simple device.
    check here:

    Make a Joule thief.

    and here:

    Joule Thief Single Cell LED Driver


    1 members found this post helpful.

  8. #8
    Newbie level 5
    Points: 457, Level: 4

    Join Date
    Jun 2011
    Posts
    8
    Helped
    0 / 0
    Points
    457
    Level
    4

    Re: Increase Voltage/Current using transistor

    Yup! i did... But i didn't actually understand the coil transformer or similar thing... anyway... i will keep on searching for the solution i found some time ago... and will post here fo help...

    Thanh for cooperation



  9. #9
    Advanced Member level 5
    Points: 37,620, Level: 47
    mister_rf's Avatar
    Join Date
    Feb 2008
    Location
    Romania
    Posts
    1,875
    Helped
    1040 / 1040
    Points
    37,620
    Level
    47

    Re: Increase Voltage/Current using transistor

    You need only a small ferrite toroid.

    ferrite-cores-magnets.jpg
    See a picture illustrating how the dots on the circuit symbol for a transformer related to the toroid windings in the joule thief circuit:
    toroid.png


    energy1.jpg
    Make-a-Joule-Thief.jpg


    3 members found this post helpful.

+ Post New Thread
Please login