I've just taken apart an older and defective HDD and saw how the head
carrying arm is built:

a flat coil with a large diameter (although not circular) moving
between 2 enormously powerfull magnets.

I got the idea to try to use this on a model R/C ship and thought of
translating the PWM signal from the receiver to whatever kind of signal
this arm will require to function.

I know this is not a strictly PIC related question, but has anyone ever
tried this before? How?

From what I've learned looking at the PCB of the HDD, the circuit
resembles an H-bridge.
I assume the hdd controller uses some kind of PWM to control where
exactly the arm is, with a high frequency as opposed to the 50Hz/20ms
repeat period of the R/C systems, hence the pic for translation, and
very similar to a DC motor controller.

Please correct me if I am wrong.

Thank you.




=====
ing. Andrei Boros
Centrul pt. Tehnologia Informatiei
Societatea Romana de Radiodifuziune

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