PC board designers.... Spindle Speeds...

Ok, I'm new and ignorant, and maybe this already exists but...

It would be great if there existed a LPT/VFD control board.

This board would have 3 relays..

The way this board would work is that it would take step signals and
convert them to 10 +/- volts output.

A direction signal would engage one of two relays depending on the
direction

The third relay is for brake and would activate whenever there is no
step pulses available, or whenever the direction pulse reversed (ie,
fwd/brake/rev)

Does this exist?


Sean