Re: [CAD_CAM_EDM_DRO] Has anyone used this HEDS unit (optical encoder for DRO)

> There is a HEDS unit that I'm thinking of using for DRO and
> feedback. I like this unit over the one at:

Many of us have used encoders with HEDS (QEDS, etc) read heads, both
linear and rotary. They work fairly well and interface with most
quadrature input devices (servo to go card, kulaga/mauch dro card,
etc).

They do not offer differential line drive, but that can be added with
an external driver chip (and much of the noise immunity benefit can be
had just by using a differential receiver).

Apparently you do need to add a bypass cap across the power supply
right at the device.

Chris

-------------------------------------------------
Christopher C. Stratton
Engineer, Instrument Maker, and Horn Player
ccs@... 617 628 1062
http://web.mit.edu/~stratton/www/brassbuild.html