 Floppy drive hacking
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Conundrum
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Tue Feb 03 2009, 09:42AM
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Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4062
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Hi all.
Did some tests on a surplus (broken) floppy drive.
Seems that there is a small possibility that feeding a 5 Hz pulse into the FG pulse input will get the spindle motor running in the absence of a spindle. I achieved fairly strong oscillations which changed amplitude and direction as i moved the hall sensors closer to the optical sled's coils which replaced the motor.
Chip failed eventually due to a stupid mistake (disconnected power without disconnecting data/clock), but it proved something interesting was going on.
It occurs to me that I may be able to wind a large area matched triple winding coil to go under the lift magnet, and use magnetic feedback from the existing Hall sensors (linear FWIW) to get the lifted magnet to stabilise similar to a Levitron AG.
Can someone else try this and get back to me?
regards, -A
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