Hello,
I have a seperate motor unit for my turntable, I originally wanted to replace the fine speed potentiometers to help get a more accurate speed out of the motor. I opened up the motor unit and am a little confused. It is 24v DC going in,powered by a 24 v DC linear power supply, but the motor is 12v AC. I would be very grateful if someone could look at the circuit board and explain to me what is going on, ultimately what I would like is to fit a better motor that has better speed stability. 24v DC motors appear to be the way ahead in this regard.
I have attached a couple of pictures, the first being the ciruit board and the motor. The second is the underside of the lid. The square board is an LED display, which shows either 33 or 45, the boards on the left are, from the bottom, 45 rpm fine speed pot, then 33 fine speed pot, next is the 33/45 selector switch and the top is the motor on/ off switch.
Thank you
I have a seperate motor unit for my turntable, I originally wanted to replace the fine speed potentiometers to help get a more accurate speed out of the motor. I opened up the motor unit and am a little confused. It is 24v DC going in,powered by a 24 v DC linear power supply, but the motor is 12v AC. I would be very grateful if someone could look at the circuit board and explain to me what is going on, ultimately what I would like is to fit a better motor that has better speed stability. 24v DC motors appear to be the way ahead in this regard.
I have attached a couple of pictures, the first being the ciruit board and the motor. The second is the underside of the lid. The square board is an LED display, which shows either 33 or 45, the boards on the left are, from the bottom, 45 rpm fine speed pot, then 33 fine speed pot, next is the 33/45 selector switch and the top is the motor on/ off switch.
Thank you
Attachments
Some information about the manufacturer and why you think the 24V motor is going to significantly improve stability might help people give you better advice about how to improve things.
Thanks for the replies, it is an Amari LP82 turntable. on the platter section of the turntable there is a GRS speed monitoring system, when the table is up to speed, it is isn’t dead stable, it fluctuates up and down, only a little, but all the same.
The motor that is fitted at the moment is a Rugulace SMR 300-100 12V.
There does not seem to be a lot of options for high quality replacement 12v AC motors.
Unfortunately the motor is back together and hooked up at the moment, I’ll post more pictures of the heat sink in the morning.
Thank you
The motor that is fitted at the moment is a Rugulace SMR 300-100 12V.
There does not seem to be a lot of options for high quality replacement 12v AC motors.
Unfortunately the motor is back together and hooked up at the moment, I’ll post more pictures of the heat sink in the morning.
Thank you
Attachments
Hello Everyone,
I took the motor apart today and have some pictures of the circuit board, any help would be greatly appreciated. Thank you
I took the motor apart today and have some pictures of the circuit board, any help would be greatly appreciated. Thank you
Attachments
This is a motor control system. It is highly unlikely that a new motor changes things. To get better control, however defined, you need to change the control system. Not for the faint of heart, and a schematic and some understanding of feedback control systems is mandatory.
Jan
Jan
The motor is a synchronous one, and on the controller board is a crystal, so all this tells it's a very stable drive system, nothing to worry unless something is malfunction, it could be the drive belt itself having become inconsistent due to aging, when did you last change it if ever, or how old is your TT?