Ok, so I understand the motor speed is set based off the 60 hertz. How do I build a speed controller like you and Geary mention? I follow you on the torque reduction idea. Can I rob the design from an existing TT (TD124 or
)? I'm confident in my ability to build the mechanical items, but I'm pretty lost on the motor controller stuff. I need a pretty clear path to follow.
Pfenning
I would not considering designing and building your own controller. It is a sophisticated device that requires considerable electronics and microprocessor expertise. There was a DIY design, short lived, Mark Kelly Synchrotron AC-1 Drive Controller. Mark sold a basic board. It worked well, but, IIRC, was difficult to build and maintain. They occasionally pop up used, but I would be wary as to why!
Until BH does a controller kit, I would focus on building the TT, (no small task!), with plans to pair it with a commercially available AC controller. A used VPI PLC can be had for about $300, the much more sophisticated SDS , used for $800-900. You can source a new unit for about $380 from Phoenix Engineering , the Falcon PSU Turntable Speed Controller. There are probably a few others of which I am not aware.
I think Doc realizes that there is a DIY market for the controller, but it may well morph into the same manufacturing issues that the DAC faced. Not a small undertaking!
Cheers,
Geary