TBH, it was something never finished. I intended to, as I've
a box of these very flat light HDD motors and want to know
exactly how to drive them. There are three pairs of n- and p-
channels FETs, a pair at each corner of the triangle to give
an "H" driver for each coil. I did get it to move by supplying
a three-channel rotating pulse but that was as far as I got. Paul
is right about a floppy motor board but I always left those as
complete units, sorry. As those have an on/off connection
then is the rotation speed set within the driver circuitry ?
Perhaps there's a timing component that could be made a
variable ? Haven't one in front of me right now, but could grab
one a bit later.

Jinx

> In the event that there is no common ground what do you
> think the waveforms are that it needs to be supplied with?
>