On Tue, 13 Nov 2012, Gene Heskett wrote:
Date: Tue, 13 Nov 2012 19:42:59 -0500
From: Gene Heskett <[email protected]>
Reply-To: "Enhanced Machine Controller (EMC)"
<[email protected]>
To: [email protected]
Subject: Re: [Emc-users] Differential signal from encoders
On Tuesday 13 November 2012 19:17:17 Viesturs L??cis did opine:
2012/11/14 Gene Heskett <[email protected]>:
> That is a good start. In view of the noise, I think I would add a quad
> of 1n914 type diodes, such that the noise can't rise too far above
> the 5volt line, or go too far below ground. Two with the cathode
> bands toward 5v, the anodes to A & B, and two more from a & B with
> their anodes connected to ground. It might save you a mysteriously
> blown chip at some point in the future.
Thanks!
I should note before you get too wild with input protection that the
26LS32As are already protected against +-25V inputs and are quite tough.
Peter Wallace
Mesa Electronics
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