Re: [CAD_CAM_EDM_DRO] noisy encoder signals.

Tom Eldredge wrote:

> Jon Elson,
>
> Question for you:
>
> At NAMES, you mentioned an IC that can be used to reduce the noise that may be picked up by encoder signal wires. Some sort of differential amplifier. Could you refresh my memory with the part number of the transmitter/receiver IC or series?

Oh, the differential drivers and receivers, sometimes known as RS-422 and RS-485
interface circuits. Every old MFM disk drive has a 26LS31 and a 26LS32 or equivalent
in it for this purpose. There are also the 75172 through 75176 and 75ALS172 through
75ALS176, and the 75ALS193, which is what I use as a differential receiver on my
encoder counter boards, as well as on other stuff. (That is most commonly an
SN74ALS193 (N or D suffix, depending on package).

Jon