Where can I buy an L239D dual H-Bridge

Discussion in 'Electronics & Electrics' started by Mattt, Feb 16, 2008.

  1. Mattt

    Mattt Member

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  2. dephilile

    dephilile Member

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    what sort of current does it need to be able to handle?

    i have used L293D H-bridges before. you can get them from RS and farnell (and probably a range of other stores). from memory they can handle 600mA per channel.
     
  3. LethalCorpse

    LethalCorpse Member

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    An h-bridge is just four mosfets, one to ground and power for each end of a coil. Lets you control polarity, and hence direction of motor movement. 8 small mosfets, while bulky, won't be expensive.
     
  4. dephilile

    dephilile Member

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    If you do it this way be careful not to short out the power supply to ground while changing the switching combinations. IC’s have logic to stop this from happening.
     
  5. LethalCorpse

    LethalCorpse Member

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    If you use p-channel and n-channel fets, you can use a single line to control each side
     
  6. nudge

    nudge Member

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    This probably isn't recommened as you need some dead time to prevent shoot-though.
     
  7. alxx

    alxx Member

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    L239 or do you mean L293D ?


    futurlec.com has a cheap stepper motor control board
    http://www.futurlec.com/StepperMotorController.shtml

    I've used a few and they are fairly good.
    They use the L298N.

    http://www.futurlec.com/ICSFOthers.shtml
    futurlec also carries the L293D for US$2.90
    They have an australian site at futurlec.com.au
    but don't list everything there.

    They are cheap but sometimes can take a while.

    The uln 2000 series driver chips (darlington pairs)
    are/can be fairly useful.
     
  8. OP
    OP
    Mattt

    Mattt Member

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    I read about he L293D, here.

    I have a bunch of odd stepper motors from some old scanners.
     
  9. Goth

    Goth Grumpy Member

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    Altronics has the L293D for $7.95, Z 2900.

    Altronics sells some quite nice stuff that Jaycar, for example, does not stock, and they're always worth keeping in mind - you can always go over to the shop and get what you want straight away, 6 days a week, without needing to order stuff.
     
  10. OP
    OP
    Mattt

    Mattt Member

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    Altronics, thanks mate, great service.
     
  11. infirmus

    infirmus Member

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    L293D is the same as L293 with diodes.

    SN754410 is a pin compatible replacement for the L293D. Its newer and can handle higher currents. Probably more available too.
     

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