Linn Lingo vs. Dr. Fuß or Square-Wave vs. Sine Wave Oscillator for Motor Control - Page 2 - diyAudio
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Old 25th June 2012, 06:09 PM   #11
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I have one of these units, the speed stability is very good. At least as good as the Lingo and far more 'adjustable'
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Old 28th June 2012, 01:01 AM   #12
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Thanks for posting that- very slick design. It may well prove the way to go-much easier to punch in numbers than to turn a pot!
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Old 28th June 2012, 01:51 AM   #13
SPWONG is offline SPWONG  Hong Kong
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Hi,
Can the DIY unit be used in LINN LP12?
I am interested to built one.
How can I get the PCB and schematic, etc.?
Thanks.
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Old 28th June 2012, 06:06 AM   #14
Nanook is offline Nanook  Canada
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Quote:
Originally Posted by SPWONG View Post
Hi,
Can the DIY unit be used in LINN LP12?
I am interested to built one.
How can I get the PCB and schematic, etc.?
Thanks.
Have a look here for an easy to follow instruction set and suggestions. Also check out Neil McBride's webpage, as I believe he is one of the originators (if not THE originator) of the 'geddon clone.
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Old 30th June 2012, 09:48 AM   #15
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Spwong, I use a geddon clone on my Kuzma. My Kuzma is 50/50 Kuzma/Lp12 and uses a Linn bearing, subplatter, platter and motor. It works perfectly and I actually prefer it over every 'clever' psu i've tried.

LP12 /Kuzma turntable PSU - a set on Flickr
Kuzma Stabi S/Stogi S 12" - a set on Flickr

I think Lee Norton beat Neil to the punch with the Geddon clone with his Norton Airpower.
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Old 9th July 2012, 03:44 PM   #16
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I've a question about Hurst motor installed in my old VPI 19 turntable. Could someone tell me how much important is to have a identical voltages on the two coils?
I ask this because with Hurst suggested 0.25uF cap, that supposedly should give a 90° phase rotation, tensions are different. I build a simple phase rotation system based on operational ICs, but, unexpectedly, when I regulate amplitude I also got phase variations! So I'd like to remove them....
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Old 9th July 2012, 04:53 PM   #17
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Originally Posted by fvale View Post
I've a question about Hurst motor installed in my old VPI 19 turntable. Could someone tell me how much important is to have a identical voltages on the two coils?
I ask this because with Hurst suggested 0.25uF cap, that supposedly should give a 90° phase rotation, tensions are different. I build a simple phase rotation system based on operational ICs, but, unexpectedly, when I regulate amplitude I also got phase variations! So I'd like to remove them....
This motor?
LYD55 55mm Direct Drive Permanent Magnet AC Synchronous Motors
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Old 9th July 2012, 05:45 PM   #18
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Originally Posted by tiefbassuebertr View Post
No, it's a PB 3203-007. VPI uses them for european market.
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Old 9th July 2012, 06:12 PM   #19
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Originally Posted by fvale View Post
No, it's a PB 3203-007. VPI uses them for european market.
o.k., this motor:
http://www.hurst-motors.com/document...B_Synch_DD.pdf
start with the 0,25uF value. Then variate the value in 10nF steps upward or downward to get lowest possible mechanical hum and noise.
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Old 9th July 2012, 06:23 PM   #20
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Thanks for advice. But what I need to know is what "theory" wants. I will not use a capacitor anymore. I've a DDS source that feeds two phase shifters followed by a TDA2050 based amp. Unfortunately I'm not able to find these informations anywhere.... even writing Hurts didn't help at all! I'm wondering if I've to look both for identical voltages through the two coils together with a 90° phase difference.
With a cap I got almost identical voltages with a 0.1uF cap, not 0.25, and much less vibration!
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