Re: [CAD_CAM_EDM_DRO] Re: Servo Dynamics 1525 servo drive noise

k8zre wrote:

>Jon...
>
>I might havein my files, a complete schematic of 1525 board, if so
>would you like a copy??...Richard.
>
>

Thanks for sending that Servo Dynamics info. I have the book for a later
version of the amp that uses MOSFETs. There are some 'black boxes'
on the drawings you sent, also, but it gives a lot of details. I see
they use a
primitive and crazy scheme to drive the power transistors in the original
BJT version of the amp, and that explains why the frequency has to be
so low. Just a terrible design!

Jon