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Thread: Best candidates for h bridge

  1. #1
    Member Advanced User sushmair's Avatar
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    Default Best candidates for h bridge

    Hi,

    Can anyone suggest what are the best transistors for a transistor based h bridge? I have made one using 2n3904's & 2n3906's - I get just about 12 mA for the dc motor which is not enough for the motors I am having. I have scavenged all motors from kids toys so dont really know their ratings.

    As an aside, are there motors that rub off 12 mA?

    Rgds,
    sushmair

  2. #2
    Senior Member Cyborg
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    use transisors based on motor current
    cheaper is 2n3055,BD139,Tip122-127
    mosfet irfz44n,irf840,irf540 etc

    all cost around Rs. 8

  3. #3
    Administrator T-1000 vikas's Avatar
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    How much current do you want to source !!!
    Vikas Patial

  4. #4
    Member Advanced User sushmair's Avatar
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    Thanks Ulhas. I'll try the TIP option next time I go shopping...

    @Vikas, I ran some tests on my motors - I guess at least 200 - 400 mA.


    BTW, I plugged a cellphone vibrating motor (extracted from a broken Samsung SGH-X620) - its a tiny one just about bigger than a button cell. Even this tyke doesnt respect the 12 mA my h bridge puts out...

    Rgds,
    sushmair.

  5. #5
    Senior Member T-1000 akshay66's Avatar
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    I once used TIP 122 for toy motors it works good.Its a darlington transisitor with more that 1A .
    Redefine it your way!!!!

  6. #6
    Administrator T-1000 rao's Avatar
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    In your case, an L293D would perform much better and be more space efficient.

  7. #7
    Senior Member T-1000 akshay66's Avatar
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    I also suggest L293D
    Redefine it your way!!!!

  8. #8
    Member Advanced User sushmair's Avatar
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    @rao, @akshay66,

    Yes - I did take a look at that option but costs are what hold me back. The end user is going to be my < 3 yr old son and I am pretty sure he will manage to destroy it. In the longer run, I am planning to add wireless comm capability to this and create multiple numbers of such bots/cars. In the immediate future I plan to spend money more on sensors than motor drivers.

    sushmair.

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