h-bridge problem

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  1. - 30th November 2006, 04:36 #1
    mister_e's Avatar
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    Have you tried to use the right forum?

    And your circuit will NEVER work.

    AND i suggest you use a newer PIC... not a museum part

    AND YES I HAD A BAD DAY

    SORRY
    Last edited by mister_e; - 30th November 2006 at 04:39.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  2. - 30th November 2006, 07:59 #2
    Armando Herjim's Avatar
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    Post Hello Vision....

    I think you should try to make a google search like they suggested. I guess your problem is that your motor requieres more much current (A) that your H-Bridge can handdle... or maybe you just need somo clamp diodes.... try clamp diodes on google...

    Good Luck.... to you too stev!

    Armando Herjim.
  3. - 30th November 2006, 09:32 #3
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    Default Diodes

    Hi Vision,
    Looks like your schematic has the diodes reversed biased, I'm not sure you even need them try reversing them or jumpering them and see what happens, I haven't even looked at your code, I assumed the others did.
    JS
    edit
    mister_e I see what you meant about using the correct forum, what manner of basic is that? Looks like a cross between c and basic. JS
    Last edited by Archangel; - 30th November 2006 at 09:39.
  4. - 30th November 2006, 15:01 #4
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    thanks all of you for your replies...

    Yes I tried Google search but in vain , Well I'll try again

    Actually I thought about adding my question in the schematic forum ,but thought about the PIC problem....

    mister_e: why my circuit will never work ? Is there something wrong?
    and please don't make your bad day affect your welcome to the newbies
    Last edited by vision; - 30th November 2006 at 15:04.
  5. - 30th November 2006, 15:20 #5
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    Quote Originally Posted by vision
    thanks all of you for your replies...

    Yes I tried Google search but in vain , Well I'll try again

    Actually I thought about adding my question in the schematic forum ,but thought about the PIC problem....

    mister_e: why my circuit will never work ? Is there something wrong?
    and please don't make your bad day affect your welcome to the newbies

    You tried a Google search...in vain? I just did a quicky and got over 1.43 million hits. I even got 186 hits on the images.

    Try again....
    JDG
  6. - 1st December 2006, 05:02 #6
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    Sorry Vision for my stupid attitude...

    The major problem is the reverse biased diodes for your PNP transistors. AND if you're going to drive inductive load, you'll have to add 4 diodes to avoid back emf.

    something like the following is recommended
    http://www.mcmanis.com/chuck/Robotic...t-circuit.html
    OR
    http://www.bobblick.com/techref/proj...e/hbridge.html

    There's also dedicated ICs for that. L293D is popular.. and there's more and more like that.

    HTH

    welcome to the forum... even if you're using PDS Proton
    Last edited by mister_e; - 1st December 2006 at 05:05.
    Steve

    It's not a bug, it's a random feature.
    There's no problem, only learning opportunities.
  7. - 1st December 2006, 20:24 #7
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    skimask :Thank you for your hint about the google IMAGE search,I didn't even think about it

    mister_e :Thank you man

    I'll inform you about the results
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