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Author Topic: Running a pager motor from a HDD activity header (off of mobo)  (Read 1800 times)

wonko

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Running a pager motor from a HDD activity header (off of mobo)
« on: December 25, 2006, 05:07:15 PM »

I'm hoping someone here can help me out with this one.  I'm wanting to use the HDD activity header off of my mobo to run a small pager motor.  I'm not sure of the amperage of the motor, and am in the process of trying to find a data sheet, but in the mean time I'm hoping someone can help out with a few ideas as far as what would be involved.  Any help would be great.  Thanks in advance.

Brian
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hollow head

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Re: Running a pager motor from a HDD activity header (off of mobo)
« Reply #1 on: December 25, 2006, 07:57:31 PM »

If you just put an optocoupler between it there should be no problem.
It's the same idea as the H.D.D. Bicolour Activity Indicator

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SteveyG

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Re: Running a pager motor from a HDD activity header (off of mobo)
« Reply #2 on: January 02, 2007, 09:12:54 AM »

Make sure you add a diode in inverse parallel with the motor to prevent damage to the transistor from the back emf of the motor. I suspect that the pager motor won't draw that much current since it's for a pager, but check that it doesn't exceed the current rating of the phototransistor. If it does, you'll need to add another transistor to increase the current drive capability.
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wonko

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Re: Running a pager motor from a HDD activity header (off of mobo)
« Reply #3 on: January 02, 2007, 04:37:30 PM »

Thank you both.  I was thinking I could kust do it that way, seeing as it will be isolated from the mobo, but wanted to make sure (and I don't have a spare mobo to experiment with).  I got it hooked up, and it works great.  Although, there seems to be so much drive activity, that I'm not getting the on/off effect I was hoping for, but at least it works.  Best hdd activity display I've seen in a long time, if I do say so myself ;).

Brian
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