Hi Giuseppe,
That's an interesting situation. As a first step, I've checked the startup behaviour of the supaspin only, for the Nano and RP2040 versions, both with and without 0.5s soft-start:
Nano:
RP2040:
These look identical, so I don't think it's down to the processor/firmware choice.
The obvious thing to do, if you have an oscilloscope, is to look at the amplifier output to the motor and see if there are any differences betweem the two setups you have. I'll try and get some waveforms for the supaspin + spinamp combination that you use in one of your setups, to see if there are any startup issues there.
That's an interesting situation. As a first step, I've checked the startup behaviour of the supaspin only, for the Nano and RP2040 versions, both with and without 0.5s soft-start:
Nano:
RP2040:
These look identical, so I don't think it's down to the processor/firmware choice.
The obvious thing to do, if you have an oscilloscope, is to look at the amplifier output to the motor and see if there are any differences betweem the two setups you have. I'll try and get some waveforms for the supaspin + spinamp combination that you use in one of your setups, to see if there are any startup issues there.
Hi,
solved the problem of random rotation at start for the supaspin_rb2040/supamp, the return wire of phase B was interrupted inside the insulating sheath!
Coming soon to friends who are fond of Thorens: a couple of tips and tricks derived from my experience to use this phase generator in quadrature with the legendary and widespread Thorens turntables series TD166, TD160, TD145, TD147 with 16Vac synchronous motor, it is absolutely possible to match and perhaps surpass the performance of an original TD125 MKII.
Cheers, Giuseppe.
solved the problem of random rotation at start for the supaspin_rb2040/supamp, the return wire of phase B was interrupted inside the insulating sheath!
Coming soon to friends who are fond of Thorens: a couple of tips and tricks derived from my experience to use this phase generator in quadrature with the legendary and widespread Thorens turntables series TD166, TD160, TD145, TD147 with 16Vac synchronous motor, it is absolutely possible to match and perhaps surpass the performance of an original TD125 MKII.
Cheers, Giuseppe.
Advanced dual sine wave power supply for thorens td166 160 147 etc, using Richb Supaspin generator and Supamp amp.
The 16 volt Thorens motor, a 16 pole, does not tolerate frequencies higher than 50Hz well, perhaps it loses too much torque, so you have to use the same technique as the td125, you have to exclude the mechanical speed change and only use the larger diameter pulley, 18.5mm, feeding with frequency 37.68 Hz you get 33.3 rpm, feeding at 50 Hz you get 45rpm. I set the initial voltage to 16Vrms, then after 10" I drop to 12Vrms (75%), the old Thorens motor will run silently and without vibrations.
The wow & flutter, measured with an app, imprecise in absolute value, also improves by 30%, stability obviously too.
We therefore hope in new developments from Richb, perhaps for a 1.2" display, two-button speed change, LED for 33.3 and LED for 45, to replace the Thorens mechanical control with an electric switch with three fixed positions.
Greetings everyone, Giuseppe.
The 16 volt Thorens motor, a 16 pole, does not tolerate frequencies higher than 50Hz well, perhaps it loses too much torque, so you have to use the same technique as the td125, you have to exclude the mechanical speed change and only use the larger diameter pulley, 18.5mm, feeding with frequency 37.68 Hz you get 33.3 rpm, feeding at 50 Hz you get 45rpm. I set the initial voltage to 16Vrms, then after 10" I drop to 12Vrms (75%), the old Thorens motor will run silently and without vibrations.
The wow & flutter, measured with an app, imprecise in absolute value, also improves by 30%, stability obviously too.
We therefore hope in new developments from Richb, perhaps for a 1.2" display, two-button speed change, LED for 33.3 and LED for 45, to replace the Thorens mechanical control with an electric switch with three fixed positions.
Greetings everyone, Giuseppe.
Dear Richmond,
I am very interested and would like to buy the complete turntable drive. Or just the PCB and wiring drawings, BOM list.
I am building 2 turntables completely with my own machining.
One DD drive is a Papst AC motor and the other is a 24 V BLCD motor with internal drive.
Controllers are a problem. I need help with this.
Best Regards
Andrew
Hungary
I am very interested and would like to buy the complete turntable drive. Or just the PCB and wiring drawings, BOM list.
I am building 2 turntables completely with my own machining.
One DD drive is a Papst AC motor and the other is a 24 V BLCD motor with internal drive.
Controllers are a problem. I need help with this.
Best Regards
Andrew
Hungary
Attachments
Andrew, that looks like an interesting project. The first post of this thread has the PCB Gerber files which you can use to get the PCB made at your chosen PCB fab (I've used JLCPCB successfully for this). The build guide has the BOM and some further useful information.
I'm definitely not an expert on the motors you have, but searching in this thread and also others for sinewave generation should give you some good examples of builds with various motors and the parts used to complete the system.
If you need any further information feel free to contact me or post here.
I'm definitely not an expert on the motors you have, but searching in this thread and also others for sinewave generation should give you some good examples of builds with various motors and the parts used to complete the system.
If you need any further information feel free to contact me or post here.
Dear Richmond,
The first post of this topic is perfect for BLCD engine.
I would like to buy a PCB or a kit. There is a PSU.
What I really want to finish is the replica of the record player in the picture. The DD AC in this picture was installed. I am attaching the controller drawing from that time. I would like to provide this with a modern frequency variable digital display controller. The motor rotates silently, sintering the replaced ball bearings.
I would like to buy a PCB or a kit. There is a AC 120 V PSU. Example LM3886 PSU
Thank you for trying to help from a distance like this
Andrew
The first post of this topic is perfect for BLCD engine.
I would like to buy a PCB or a kit. There is a PSU.
What I really want to finish is the replica of the record player in the picture. The DD AC in this picture was installed. I am attaching the controller drawing from that time. I would like to provide this with a modern frequency variable digital display controller. The motor rotates silently, sintering the replaced ball bearings.
I would like to buy a PCB or a kit. There is a AC 120 V PSU. Example LM3886 PSU
Thank you for trying to help from a distance like this
Andrew
Attachments
Dear Rich,
Unfortunately, the originally planned drive does not work. Pictured is 334-450 Rpm. By connecting the 7440 IC, I was able to reduce the speed to 66.
Torque is gone. The engine is the original studio turntable engine!
It's not the engine that's the problem, it's the control.
I would like to request your feedback on how I can buy your development?
Andrew
Unfortunately, the originally planned drive does not work. Pictured is 334-450 Rpm. By connecting the 7440 IC, I was able to reduce the speed to 66.
Torque is gone. The engine is the original studio turntable engine!
It's not the engine that's the problem, it's the control.
I would like to request your feedback on how I can buy your development?
Andrew
Attachments
Zincho
It works
What is not on the drawing is a Z=250 toothed tachograph.
This must be connected to the "on" side.
There will be a new PCB for it soon.
What is important is the C7 52nf capacitor 0.5% max 1%.
With a 1.1 kg plate, it reaches the speed in less than a quarter. Its torque is huge.
It works
What is not on the drawing is a Z=250 toothed tachograph.
This must be connected to the "on" side.
There will be a new PCB for it soon.
What is important is the C7 52nf capacitor 0.5% max 1%.
With a 1.1 kg plate, it reaches the speed in less than a quarter. Its torque is huge.
