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Old 19th November 2003, 11:28 PM   #1
nige is offline nige  United Kingdom
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Question Michell DC motor type

Sirs,
I am writing to ask if anyone would know the make and type of DC motor Michell uses on the Gyrodec turntables.

Thanking you for any help
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Old 20th November 2003, 05:15 AM   #2
Werner is offline Werner  Europe
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Why? Do you have a problem?
I know some things about this motor.
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Old 20th November 2003, 05:18 AM   #3
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Quote:
Originally posted by Werner
Why? Do you have a problem?
I know some things about this motor.
No, but I'm curious what it is too.
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Old 30th November 2003, 12:25 AM   #4
lovemov is offline lovemov  United States
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I also want to know. I have one, the speed is unstable, got jitter when listening music. No idea what I can do to improve it, replace a new motor? My table is only 1 month old. I guess it's a design flaw in there tables, the power supply is only a 317, really a joke for a $2000 table...
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Old 2nd December 2003, 08:12 PM   #5
Raka is offline Raka  Europe
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Quote:
Originally posted by lovemov
the power supply is only a 317, really a joke for a $2000 table...
Really? could you draw the schematic from an inspection?
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Old 3rd December 2003, 05:05 AM   #6
Werner is offline Werner  Europe
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Failure of the motor itself is improbable. It is, however, mounted in a rubber 'sock', the spindle protruding through a tiny hand-made hole in the rubber.

Now, if the sock shifts a bit, or if fragments of rubber get dislodged from the hole, parts can touch the spindle, giving rise to excessive noise and/or wow.

Another possibility is the stiff drive belt that has been offered as an upgrade during a short period. In my experience that belt is so stiff that just a couple of days of not using it makes the pulley make a permanent kink in the belt, leading to drive problems later on.
The stiff belt might be an upgrade, but only for those of us playing records every day and night.
It seems that Michell now deliver the old-style soft belt again.

There is nothing wrong with using LM317s in turntable DC motors.
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Old 6th December 2003, 03:56 AM   #7
lovemov is offline lovemov  United States
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I don't have a schematic, but I remember it's just wired as standard regulator.
There is nothing wrong to use 317, but the problem is 317 offer stable voltage only, but no way will maintain stable speed, this is a problem. I can hear jitter easily, especially for solo piano music. I don't know what I can do to improve it.
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Old 6th December 2003, 02:36 PM   #8
Raka is offline Raka  Europe
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Quote:
Originally posted by lovemov
I don't have a schematic, but I remember it's just wired as standard regulator.
There is nothing wrong to use 317, but the problem is 317 offer stable voltage only, but no way will maintain stable speed, this is a problem. I can hear jitter easily, especially for solo piano music. I don't know what I can do to improve it.

There was an application note (from AD maybe?) that suggested a circuit that inserted the motor resistance in the feedback loop I think, mm, I can't remember anything else, maybe some searching...
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