I was thinking about replacing the motor in my TD166 MkII with a brushless DC motor. The main aim is electronic speed adjustment to replace the mechanical belt-shifter.
Has anyone tried this? I did find the Origin Live and would like to built my own "cheaper" version of that.
Was thinking of using PWM speed control, possibly with hall sensor. Or an Arduino-based controller.
Can use soft-start or keep the original clutch-pulley
Is this a good idea? I would appreciate any advice on the best motor/pulley to use and reliable speed controllers.
Alternatively; let me know if it is a stupid idea and that I should just leave it alone 🙂
Has anyone tried this? I did find the Origin Live and would like to built my own "cheaper" version of that.
Was thinking of using PWM speed control, possibly with hall sensor. Or an Arduino-based controller.
Can use soft-start or keep the original clutch-pulley
Is this a good idea? I would appreciate any advice on the best motor/pulley to use and reliable speed controllers.
Alternatively; let me know if it is a stupid idea and that I should just leave it alone 🙂
You may be able to put a black spot on the motor shaft that could be picked up with a photo transistor setup.
A 12v dc fan motor uses a hall effect sensor, the frequency can be extracted and then used to regulate speed to required.
A 12v dc fan motor uses a hall effect sensor, the frequency can be extracted and then used to regulate speed to required.
The BLDC drive uses electronic commutation, that can be a source of noise, be careful about that.
I think there are threads about this conversion (on other tables) here on diyaudio, just go through those posts for a better idea of the work involved.
And you need not go full digital, a multi turn pot on the feedback loop, with a digital display, is quite enough to control the speed, though tiny controllers are very cheap these days.
You might as well go whole hog and upgrade the bearing to a ceramic ball, or otherwise make it smoother to reduce rumble from the mechanism.
I think there are threads about this conversion (on other tables) here on diyaudio, just go through those posts for a better idea of the work involved.
And you need not go full digital, a multi turn pot on the feedback loop, with a digital display, is quite enough to control the speed, though tiny controllers are very cheap these days.
You might as well go whole hog and upgrade the bearing to a ceramic ball, or otherwise make it smoother to reduce rumble from the mechanism.
No problems with rumble since I built the new damped plinth.
I found some of the threads you were talking about. It doesn''t seem like a very popular or easy mod. Maybe I should take the hint.
I thought it would be handy to switch between 33 and 45 at the flick of a switch rather than shifting the belt. I've had this TT from new (>35 years), I should probably leave it alone. I was hoping someone had successfully modded the TD166 (motor), that would be encouraging.
I found some of the threads you were talking about. It doesn''t seem like a very popular or easy mod. Maybe I should take the hint.
I thought it would be handy to switch between 33 and 45 at the flick of a switch rather than shifting the belt. I've had this TT from new (>35 years), I should probably leave it alone. I was hoping someone had successfully modded the TD166 (motor), that would be encouraging.
Another motor worthy of consideration is this:-
https://www.ebay.co.uk/itm/235536635718 ... 5735062836
It is a 3 phase motor, with decent sleeve bearings, and when driven properly runs almost completely silently, and with little or no vibration.
Either Pyramid's SG4 https://www.diyaudio.com/community/...rator-for-turntable-motor-drive.298018/latest
or Richb's Superspin https://www.diyaudio.com/community/...tor-for-synchronous-motor-drive.365849/latest
would provide an excellent source of 3 phase signals.
For those not into stuffing pcbs there's also this:- https://www.ebay.co.uk/itm/363357898050 , not as flexible, but still
a worthwhile alternative. For all of these you need to add 3 small power amplifiers; I've used these with some success:-
https://www.ebay.co.uk/itm/186363266824 ... 4413503947
As a completely 'off the wall' alternative have a look at these:- https://www.ebay.co.uk/itm/394878303787
no amps needed, just a 12v wallwart and a replacement potentiometer (i used a 10 turn cermet trimmer).
https://www.ebay.co.uk/itm/235536635718 ... 5735062836
It is a 3 phase motor, with decent sleeve bearings, and when driven properly runs almost completely silently, and with little or no vibration.
Either Pyramid's SG4 https://www.diyaudio.com/community/...rator-for-turntable-motor-drive.298018/latest
or Richb's Superspin https://www.diyaudio.com/community/...tor-for-synchronous-motor-drive.365849/latest
would provide an excellent source of 3 phase signals.
For those not into stuffing pcbs there's also this:- https://www.ebay.co.uk/itm/363357898050 , not as flexible, but still
a worthwhile alternative. For all of these you need to add 3 small power amplifiers; I've used these with some success:-
https://www.ebay.co.uk/itm/186363266824 ... 4413503947
As a completely 'off the wall' alternative have a look at these:- https://www.ebay.co.uk/itm/394878303787
no amps needed, just a 12v wallwart and a replacement potentiometer (i used a 10 turn cermet trimmer).
i use an Arduino-type board + plug in bldc driver board + SimpleFOC software library to generate 3-phase sine waves (or SpaceVector waves) to drive my BLDC motor. It is silent, and achieves extremely low speed variation.
$50 in motor control hardware + $100 for a nice strong low coggimg bldc motor (like a 4pole or 8pole BLDC from Anaheim Automation) is pretty awesome.
i have used both Arduino and STMicro Nucleo boards.
$50 in motor control hardware + $100 for a nice strong low coggimg bldc motor (like a 4pole or 8pole BLDC from Anaheim Automation) is pretty awesome.
i have used both Arduino and STMicro Nucleo boards.
I might experiment with that motor and the ""off the wall" controller. What value of trimmer pot did you use? I was thinking of using two pots - one set for 33 and one for 45 - and switching between them. I think that will work.
I also found this motor...
Nidec 24H
Looks like it might be a good option (if it fits).
Plenty of good suggestions. The one thing I am stuck on is finding a suitable pulley. There are plenty of toothed pulleys but obviously not suitable (unless I stick it in a lathe and machine the teeth off).
This motor...
Nidec 27H060D180
Has a 3.15mm shaft (eek)
This one...
Nidec 24h
Has a 6mm shaft but it has a flat - I guess it could work if it has allen screws in the pulley
Any thoughts on a pulley to suit one of those. There's flexibility on diameter as the motor is speed-adjustable. Not too big though, I guess.
I'm trying not to spend too much in the "experimenting" phase just because the components might not be suitable.
This motor...
Nidec 27H060D180
Has a 3.15mm shaft (eek)
This one...
Nidec 24h
Has a 6mm shaft but it has a flat - I guess it could work if it has allen screws in the pulley
Any thoughts on a pulley to suit one of those. There's flexibility on diameter as the motor is speed-adjustable. Not too big though, I guess.
I'm trying not to spend too much in the "experimenting" phase just because the components might not be suitable.
This is very tempting but I don't know if it is better to stick with one of the simple PWM controllers. Is there any advantage to using a programmable controller? I'm guessing you can set up things like soft-start and braking. Does it give you real-time speed locking?
I'm having trouble sourcing decent motors here in Australia (like the ones you suggested). Do you have an opinion on the ones I linked above?
BTW: Did you do your mod on a Thorens deck?
those are terrible. they dont output clean sine waves. i tried one, and it made the motor very loud.
I used 10k 10 turn trimpots
Using two pots and switching between them for 33 and 45 rpm works fine; what I'm not so sure about is the consistency of the speeds.
I'll have to fit it to a TT and try it out. The other aspect of this controller is how much electrical noise it generates, and how easy it is to screen it.
Using two pots and switching between them for 33 and 45 rpm works fine; what I'm not so sure about is the consistency of the speeds.
I'll have to fit it to a TT and try it out. The other aspect of this controller is how much electrical noise it generates, and how easy it is to screen it.
