Linn 50hz to 60hz?

protos · 23rd June 2005, 04:30 PM

When I moved here to Brazil I did not realize that my old TT was not going to work since it has a 50hz ac motor and the mains is 60hz.
What would be the most cost efficient way to deal with this without buying a new motor (eg Origin dc motors/ps go for 400gbp!)
A PS providing 50hz AC?
Any schematics?

Magura · 23rd June 2005, 04:51 PM

A real simple, good and cheap solution would be to get a frquency controller. Such is very commonly used in industrial motor control applications, and is therefore cheap. You should be able to find a new unit for something like 100USD, and a used for like half on ebay.

Magura

EC8010 · 24th June 2005, 09:39 AM

I doubt if the output from a frequency contoller is a nice clean sine wave, and a synchronous motor has such low moving mass that it can easily lock to a poor waveform.

There have previously been threads about AC synthesis on this forum. The simplest solution is to use an op-amp oscillator feeding a small power amplifier then a backwards transformer to step the voltage up to drive the motor. If you use an IC power amplifier it really ought to be possible to knock the whole thing up quite cheaply.

Alternatively, why not just find out the price of a 60Hz Linn pulley?

analog_sa · 24th June 2005, 07:35 PM

Why don't you either build or buy a Valhalla? They seem to go for a $100 or thereabouts used.

23rd June 2005, 04:30 PM	#1
protos diyAudio Member Join Date: Mar 2002 Location: Athens+Addis Ababa	Linn 50hz to 60hz? When I moved here to Brazil I did not realize that my old TT was not going to work since it has a 50hz ac motor and the mains is 60hz. What would be the most cost efficient way to deal with this without buying a new motor (eg Origin dc motors/ps go for 400gbp!) A PS providing 50hz AC? Any schematics?

23rd June 2005, 04:51 PM	#2
Magura diyAudio Member Join Date: Oct 2003 Location: Denmark, Viborg	A real simple, good and cheap solution would be to get a frquency controller. Such is very commonly used in industrial motor control applications, and is therefore cheap. You should be able to find a new unit for something like 100USD, and a used for like half on ebay. Magura __________________ Everything is possible....to do the impossible just takes a little while longer. www.class-a-labs.com

24th June 2005, 09:39 AM	#3
EC8010 diyAudio Moderator Emeritus Join Date: Jan 2003 Location: Near London. UK	I doubt if the output from a frequency contoller is a nice clean sine wave, and a synchronous motor has such low moving mass that it can easily lock to a poor waveform. There have previously been threads about AC synthesis on this forum. The simplest solution is to use an op-amp oscillator feeding a small power amplifier then a backwards transformer to step the voltage up to drive the motor. If you use an IC power amplifier it really ought to be possible to knock the whole thing up quite cheaply. Alternatively, why not just find out the price of a 60Hz Linn pulley? __________________ The loudspeaker: The only commercial Hi-Fi item where a disproportionate part of the budget isn't spent on the box. And the one where it would make a difference...

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24th June 2005, 07:35 PM	#4
analog_sa diyAudio Member Join Date: Aug 2002 Location: Sofia	Why don't you either build or buy a Valhalla? They seem to go for a $100 or thereabouts used.

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