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Hello David, John,

Thank you for your thoughts.

Yes the module is very small - remarkably so. I suspect that it does use the metal as a heatsink as there is heat conductive compound between it and the metal base of the projector.

It would be great to create a modern substitute, but I suspect I'd be out of my depth here. I did look at some ICs and what they might offer, but then I got stuck on whether or not I needed to convert frequency to volts or just use volts direct as the feedback.

I also didn't know whether to go down a pulse with modulation output or not etc.

I wonder what goes wrong with the motors? Mine appears to be ok, at least for the moment, but it's an interesting observation all the same.

Thank you for asking about possible spares.

Regards,

Andy