On 19/01/2017 11:17, Dave Plowman (News) wrote:
In article ,
wrote:
On Thursday, 19 January 2017 04:43:41 UTC, Andy Burns wrote:
dennis@home wrote:

I wonder if it would work sat directly on top of a big stepper motor.

You still have a physical connection between your motor and turntable? A
bit old hat, isn't it :-P

https://maglevaudio.com

I don't think belt drive has ever been bettered. Some would disagree, direct drive gives more constant speed, but the variations of a competently executed belt drive are below human detection.


The problem with direct drive is preventing stray fields having some form
of influence on the cartridge. Even if not directly audible.


Mines a lump of metal so if I 3D printed a stepper motor disk and
mounted it on the underside and then put the coils on the underside it
would be well shielded.

It shouldn't take much to put say 64 magnets underneath and add a couple
of coils to drive it from an arduino nano.

Here is a crude stepper someone has done.

http://www.instructables.com/id/3D-P...Stepper-Motor/

Maybe I'll make a roundtoit one day.