Re: Signal interference in a long cable

From: Michał Pleban <*lists_at_michau.name*> Date: Wed, 21 Dec 2016 22:15:51 +0100 Message-ID: <585AF107.3030002@michau.name> · lists_at_michau.name

Hello!

Gerrit Heitsch wrote:

> You have short spikes you want to get rid off. How about a capacitor
> between the signal and GND. Yes, that will soften the signal in general
> so you have to experiment if there is a cap that will work without
> softening the rising and falling edges too much. Put the cap at the
> input of the shift register or the 74LS14 if used.
> 
> Try 470pF and see what happens.

The closest I had was 1nF. The signal got visibly better, and I was able
to read the dist directory - big improvement!

What is the significance of 470pF? Is it related to the clock speed?

Regards,
Michau.

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