On another forum I came across mods for a Michell Gyro/Orbe turntable, replacing the stainless steel ball bearing by ceramic, plastic, changing the suspension turrets to use rubber o-rings (like on SME turntables) and mods for the motor etc.
What got me thinking is changing the power supply for the motor, which I believe is a Papst 24v? motor. My power supply is perspex box with 2 transformers but it should be possible to build a quiet DC supply, amplifier and a PIC to play a digitised sinewave. A second sinewave albeit at a higher frequency could be used for 45 rpm so no need to move the belts on to the larger spindle.
I sure something like this has been done, the part I'm lacking is what voltage is required by the motor, (I don't understand why my power supply has 2 transformers). Hopefully someone can point me in the right direction.
What got me thinking is changing the power supply for the motor, which I believe is a Papst 24v? motor. My power supply is perspex box with 2 transformers but it should be possible to build a quiet DC supply, amplifier and a PIC to play a digitised sinewave. A second sinewave albeit at a higher frequency could be used for 45 rpm so no need to move the belts on to the larger spindle.
I sure something like this has been done, the part I'm lacking is what voltage is required by the motor, (I don't understand why my power supply has 2 transformers). Hopefully someone can point me in the right direction.
Can you take any photos? Early Papst motors are 3 phase devices, often driven by a single phase supply and a 'faking' capacitor.
I've not seen a 2 phase Papst motor, but many Premotec, airpax, and phillips motors are 2 phase designs.
There are two designs well known on this site that will produce the requisite frequencies:-
https://www.diyaudio.com/community/...e-generator-for-turntable-motor-drive.298018/
and
https://www.diyaudio.com/community/...generator-for-synchronous-motor-drive.365849/
Give us a bit more info and I'm sure lots of useful info will be forthcoming
In order to avoid any conflict of interests I am the UK and ROW distributor for the SG4 chip and pcb.
Good Luck
I've not seen a 2 phase Papst motor, but many Premotec, airpax, and phillips motors are 2 phase designs.
There are two designs well known on this site that will produce the requisite frequencies:-
https://www.diyaudio.com/community/...e-generator-for-turntable-motor-drive.298018/
and
https://www.diyaudio.com/community/...generator-for-synchronous-motor-drive.365849/
Give us a bit more info and I'm sure lots of useful info will be forthcoming
In order to avoid any conflict of interests I am the UK and ROW distributor for the SG4 chip and pcb.
Good Luck
I have identified the power supply as a Gyro power.
From what I gather, it is a more sophisticated version of the a phase shifted supply like this (dunno if you call that 2 or 3 phase, I'd call it 2 phase)
Yes indeed I found your post, but the challenge is to DIY, the simplest of PICs with DAC would do it, a pi pico is on overkill for what I would like to have.
From what I gather, it is a more sophisticated version of the a phase shifted supply like this (dunno if you call that 2 or 3 phase, I'd call it 2 phase)
Yes indeed I found your post, but the challenge is to DIY, the simplest of PICs with DAC would do it, a pi pico is on overkill for what I would like to have.