2. analog
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I think I am going to attempt to make turntatbles

First off let me say I am not new to the audio realm. I am a computer engineer and yes I realize that deals in ones and zeros. However, I have made a few custom guitars. I know a master woodworker and a talented machinist. I have been searching for that perfect table for years whilst living in mediocrity. Well, I have the resources; why not make one from scratch. More than likely I am going to attempt a belt drive unit at first using an off the shelf arm... More than likely an SME. I am working on the power supply circuitry right now as my piece. Any one have any tips... I am thinking solid, large mdf plinth with an attached copper mat and either a heavy plinth with an acoustically decoupled motor or completely detached. Thoughts?
bc5k
bc5k OP
29 posts
 
I realize it's involved; and that it may not make sense financially... Well that is unless you plan on selling your creation (which we do). This is the start and I realize the wheel could be being reinvented a little bit; But construction has began on the first plinth and I am excited. The first order of business is for me to take the guts of a VERY inferior table and make it sound very much so better. Then they will slowly but surely be swapped out with more custom pieces. This is a learning process... but I learn quickly... hopefully in a few months I will have some results to share.
bc5k OP
29 posts
 
Gregm,

While that is an awesome idea for the levitating platter, would this not interfere with cartridge pickup? I definitely am going to try this as I have done a many of levitation projects in the past with tesla coils and etc...
livemusic
16 posts
 
Nowdays it is easy to find strong magnets for cheap on web. But,be warned that isolation from strong magnet field is extremely difficult. I have abandoned this idea after messimg around with multiply mu-metal sheet screens; my best attempt reduced the magnet field by 30% - still way to mutch to live with it. Buy at least good magnetometer for check if you wanna take the plunge.
inna
7,296 posts
 
I suggest you start with the platter design. If you can't get this right nothing else matters. Then the bearings.
bc5k OP
29 posts
 
How about using a thing sheet magnet under the platter and then shield it with aluminum... much like magnetically shielding a transducer? my idea is to use some sort of less powerful magnetic field underneath the platter to levitate it against another magnet point downward... so pole differential... in theory the repelling action should float it... then there would be a layer of shielding and the opposing forces of the magnets with their backs to the vinyl should not create any undue fields... i would just have to fashion a skirt for the bottom of the platter out of aluminum as well... ooh i have an idea... have to go sketch this out in autocad right quick... bbl
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