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  1. #1
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    h-bridge with 2n2222a

    i am trying to make H-bridge to drive a small DC motors about (15 ohms , and 40 ohm) , using 2n2222a and 2n2907
    but i am facing problems on the simulation , on proteus ,
    it seems that 2n2907 doesn't go to saturation -it drops about 3.7v- ,
    i tried the bridge using tip122 and tip127 and it worked fine on proteus , but i don't have them now , and i am not sure if i can find them here.

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    Re: h-bridge using 2n2222a and 2n2907

    Just build that bridge of real components – I can assure you it will work ..

    IanP
    :D



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    h-bridge using 2n2222a and 2n2907

    you can also go for the IC package L293D



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    h-bridge using 2n2222a and 2n2907

    Current supplied by 2N2222 or 2N2907 cannot handle driving an average hobby motor due to lesser current capability. Better choice will be the TIP's or 2N3055-2N2955 pair (may be TO220 packages). Even the L293D will be a good choice.
    Cheers



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    Re: h-bridge using 2n2222a and 2n2907

    change the 2n2222a base resistor to 3.3k or 3.9k
    and simulate it.



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  6. #6
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    h-bridge using 2n2222a and 2n2907

    thanks guys for your advices!!!!!!
    Ianp:
    it seems , that i will do that at the end , but i don't want to do any damage to the transistors.

    fuuton: L298 is available here , but i felt that it's more than enough for a toy motor (it can support up to 3A i think) , i thought using 2n2222a will be more cheaper.

    pranam77:
    2n2222a and 2n2907 can handle up to 600mA , i thought that will be more than enough for a toy motor (it takes about 400mA when using 5V) ,
    the problem that 2n2907 doesn't go to saturation and i don't know why!!!

    srizbf: same problem.



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    Re: h-bridge using 2n2222a and 2n2907

    Quote Originally Posted by evilheart
    2n2222a and 2n2907 can handle up to 600mA , i thought that will be more than enough for a toy motor (it takes about 400mA when using 5V) ,
    the problem that 2n2907 doesn't go to saturation and i don't know why!!!
    srizbf: same problem.
    2N2222 pair may handle 600ma but maynot be without heatsinks and its difficult to fit a heatsink for that package. That may be the reason your 2907 is saturated. Or measure the base bias volatges.
    Cheers



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