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How does turntable AC speed controller work?
How does turntable AC speed controller work?
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Old 17th January 2018, 06:48 PM   #11
Pyramid is offline Pyramid  United States
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If the drive signal is steady, but the platter speed fluctuates, it may be indicative of other problems with the table such as bearing lubrication, belt contamination, worn belt, slippage etc. Changing to a different controller would not make much difference in this case.
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Old 17th January 2018, 07:17 PM   #12
Sunsun22 is offline Sunsun22  Hong Kong
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Yes, you are right. I just noticed two out of six belts are worn. Will change them and see if it improves. Indeed, they have been running since 2010. Time to change.
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Old 18th January 2018, 01:20 AM   #13
Sunsun22 is offline Sunsun22  Hong Kong
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Quote:
Originally Posted by Pyramid View Post
If the drive signal is steady, but the platter speed fluctuates, it may be indicative of other problems with the table such as bearing lubrication, belt contamination, worn belt, slippage etc. Changing to a different controller would not make much difference in this case.
One thing about my controller is it uses a 10K VR to trim the speed that it is difficult to trim. Is there something ready made in the market like a digital trimmer to replace the 10K VR in the circuit?
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Old 18th January 2018, 01:40 AM   #14
stocktrader200 is offline stocktrader200  Canada
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you can get a 10 turn pot or you can measure the resistance from wiper to end and fit in 1% resistors.
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Old 18th January 2018, 03:46 AM   #15
Sunsun22 is offline Sunsun22  Hong Kong
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The VR is a dual gangs.

I eventually discovered that the VR is only used as a resistor rather than a divider therefore I parallel a resistor on each gang to lower the total resistance. It is getting easier to fine tune the speed now.
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