Finding a 12V DC motor controller

audiofilo123 · 26th April 2006, 07:27 AM

I'm building up a DIY TT and I pretend to use a 12V DC motor but I'll need a proper controller to set the exact speed (only for 33 RPM set with the help of a strobe disc/light).

I've got a couple of 12V MAXON and one PREMOTEC motor (taken from a REGA P3) and I just need that controller to put things moving

I've got a 220/50HZ voltage adjustable power supply model ZETAGI HP156S (Stabilized 4÷16 V 7 A with 2 Instrum).

CAN ANYBODY HELPME TO FIND THE PROPER CONTROLLER? It can be assembled or in kit form.

Thanks

sreten · 26th April 2006, 12:32 PM

Hi,

The speed of a DC motor is related to the voltage across it.

That is the motor speeds up until the back emf = applied voltage.

So all you need is a precision adjustable voltage supply,
that current limits - this will set your starting torque.

Something like an LM317 with a bandgap voltage reference.

/sreten.

paulb · 26th April 2006, 01:31 PM

Some form of feedback will be needed to keep the speed constant, a regulated voltage source will not be enough.

sreten · 26th April 2006, 03:41 PM

Quote:

Originally posted by paulb
Some form of feedback will be needed to keep the speed constant,
a regulated voltage source will not be enough.

Hi,

If the DC motor is not designed to be servo'd there is not much you can do.

A DC motor will run near constant speed, drawing more current if required.

The Origin Live dc motor kit is simply voltage driven, no-ones complained
about speed drift is any of the reviews of fitting the OL motor.

/sreten.

SvErD · 26th April 2006, 04:40 PM

Who is interested in a groupbuy of Mark Kelly's DC controller PCB and related parts

paulb · 27th April 2006, 02:43 AM

Sounds like exactly what you are looking for.
I think I would go for the error correcting version of the circuit, I mistrust the positive feedback - it might be finicky.

Aleksunder · 27th April 2006, 10:47 AM

The the Rega P3 uses an AC motor.

If you got a Premotec DC one from a Rega, it's quite possibly an Origin Live retrofit (the OL kit I bought 4 years ago uses a Premotec), in which case if you still have the Rega, it might have the OL board in it.

If so. and it's still working, all you need is a decent transformer with selectable V out.

A

johnthedoctor · 27th April 2006, 12:29 PM

http://www.altmann.haan.de/turntable/

This guy uses a stepper motor fed with a signal from a cdp.

audiofilo123 · 29th April 2006, 09:31 PM

Thanks for all the help

Can this work propely with a one of those 12V maxon motors? :

http://cgi.ebay.com/ws/eBayISAPI.dll...Pr4_PcY_BID_IT

thanks

IZHAKKATZ · 1st May 2006, 12:43 PM

Hi,

could this help you?

http://uk.farnell.com/jsp/endecaSear...=4913425&N=401

I was thinking of using it with a 6 V maxon motor.

IK

26th April 2006, 07:27 AM	#1
audiofilo123 diyAudio Member Join Date: Jan 2005 Location: portugal	Finding a 12V DC motor controller I'm building up a DIY TT and I pretend to use a 12V DC motor but I'll need a proper controller to set the exact speed (only for 33 RPM set with the help of a strobe disc/light). I've got a couple of 12V MAXON and one PREMOTEC motor (taken from a REGA P3) and I just need that controller to put things moving I've got a 220/50HZ voltage adjustable power supply model ZETAGI HP156S (Stabilized 4÷16 V 7 A with 2 Instrum). CAN ANYBODY HELPME TO FIND THE PROPER CONTROLLER? It can be assembled or in kit form. Thanks

26th April 2006, 04:40 PM	#5
SvErD diyAudio Member Join Date: Jan 2002 Location: Norway	Like this? Who is interested in a groupbuy of Mark Kelly's DC controller PCB and related parts __________________ I don't suffer from insanity, I enjoy every minute of it!

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26th April 2006, 12:32 PM	#2
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, The speed of a DC motor is related to the voltage across it. That is the motor speeds up until the back emf = applied voltage. So all you need is a precision adjustable voltage supply, that current limits - this will set your starting torque. Something like an LM317 with a bandgap voltage reference. /sreten.

26th April 2006, 01:31 PM	#3
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Some form of feedback will be needed to keep the speed constant, a regulated voltage source will not be enough.

27th April 2006, 02:43 AM	#6
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Sounds like exactly what you are looking for. I think I would go for the error correcting version of the circuit, I mistrust the positive feedback - it might be finicky.

27th April 2006, 10:47 AM	#7
Aleksunder diyAudio Member Join Date: Apr 2006 Location: London	The the Rega P3 uses an AC motor. If you got a Premotec DC one from a Rega, it's quite possibly an Origin Live retrofit (the OL kit I bought 4 years ago uses a Premotec), in which case if you still have the Rega, it might have the OL board in it. If so. and it's still working, all you need is a decent transformer with selectable V out. A

27th April 2006, 12:29 PM	#8
johnthedoctor diyAudio Member Join Date: Sep 2005	http://www.altmann.haan.de/turntable/ This guy uses a stepper motor fed with a signal from a cdp.

29th April 2006, 09:31 PM	#9
audiofilo123 diyAudio Member Join Date: Jan 2005 Location: portugal	Thanks for all the help Can this work propely with a one of those 12V maxon motors? : http://cgi.ebay.com/ws/eBayISAPI.dll...Pr4_PcY_BID_IT thanks

1st May 2006, 12:43 PM	#10
IZHAKKATZ diyAudio Member Join Date: Jul 2004 Location: Israel	Hi, could this help you? http://uk.farnell.com/jsp/endecaSear...=4913425&N=401 I was thinking of using it with a 6 V maxon motor. IK

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