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Old 02-19-2011, 06:44 AM #1
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Exclamation Troubles with HDD Galvos =/

Hi, i got two hard drives 2 days ago, I connected them arm to the PC but didn't worked. Then i was trying again with the loudspeaker of a home teather, but didn't worked... Then i tried with the subwoofer of the home teather and it worked, but only with the basses =/

What i can do to amplify the PC sound and connect the hard drives? Any ideas? Yep, i tried software but is too weak =/

Thanks for all


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Old 02-19-2011, 07:39 AM #2
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Default Re: Troubles with HDD Galvos =/

You need some final stage amplifiers, and anyway remember that the inertial mass of the HDD arms is not light enough for react well to high frequencies.

just as example, as cheap units:

DealExtreme: $9.70 VMA2016 2*10W Audio Amplifier Module

DealExtreme: $13.43 VMA2016 2*10W Audio Amplifier Evaluation Module (EVM) Board
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Old 02-19-2011, 05:34 PM #3
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Default Re: Troubles with HDD Galvos =/

Oh thanks!
I have another question... A transistor or operational amplifier will work with a 4.5V source? Thanks

PD; I watched this video that shows two hard drives reacting to the high frequencies, i think is using a big amp :P
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Old 02-20-2011, 09:19 AM #4
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Default Re: Troubles with HDD Galvos =/

Yes, there are op-amps that will work with also only 3V, and a transistor will work with any voltage over VCE, depending from the structure of the transistor and the schematic that you use.

But a normal op-amp will not have enough current for move those coils, and with transistors, you need to design a specific circuit for your needs ..... those units that i have linked, have the advantage that they are "ready-to-use", but ofcourse you can design any type of circuit you want, both transistors only or transistors drived from op-amps.
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Old 02-21-2011, 01:57 AM #5
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Default Re: Troubles with HDD Galvos =/

I got temporally two transistors and all its nice, but, i have another trouble..
When i put the two hard drives in the classic stepper motors position, the arm goes down and doesn't moves correctly, the moving is limited =/
How i can fix it? Thanks
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Old 02-21-2011, 03:39 PM #6
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Default Re: Troubles with HDD Galvos =/

Are you using a class-A PWM configuration, or just powering the coils and using a spring for keep the arms in the middle position ?
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Old 02-21-2011, 10:59 PM #7
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Default Re: Troubles with HDD Galvos =/

I weld two cables to the top of the arm, then i just tried to pull the cables and force the arm to stay at the center, but i didn't worked because the movement is limited =/
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Old 02-22-2011, 12:22 AM #8
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Default Re: Troubles with HDD Galvos =/

The amplifiers from DX are CRAP for audio output.. THD goes as high as 20% IMO...

They don't heat at all, the only PRO.
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Old 02-23-2011, 07:28 AM #9
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Default Re: Troubles with HDD Galvos =/

^ yes, they are not for professional use, maybe good enough for PA, but few other ..... but they remain a discretely cheap solution for motor or servo driving, if not other
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Old 03-08-2011, 07:20 AM #10
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Default Re: Troubles with HDD Galvos =/

quote: Sourcegeek
"I weld two cables to the top of the arm, then i just tried to pull the cables and force the arm to stay at the center, but i didn't worked because the movement is limited =/ "

i was pondering the same thing with the hdd arm voice coil, would adding a high frequency modulation to the input (oscillating the arm with small amplitude) help fix its position or at least stabilize it in the magnetic field? and on a side note, would dc offsetting this change its position!??!?

also Soucegeek if you didnt know the hdd platter contains a feed back track that constantly sends back position info via the pick up head so the driver knows where its located.
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Old 03-08-2011, 08:29 AM #11
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Default Re: Troubles with HDD Galvos =/

You can try with an H bridge configuration driven from a PWM source ..... and changing the PWM duty-cycle for move the coil.
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