[sdiy] 4051 spikes

[Jay Schwichtenberg]

As Richie said get a good ground on there. You really can't get good
measurements with scopes without a ground.

A couple of other things.

Put a load on the output. Do not exceed the current draw of the 4051. When
you have a load the glitches might not be strong enough to show up.

Most mux type circuits have some form of low pass filters to get rid of
glitches on transitions. So that may clean up the signal some.

It's a long shot but put some bypass caps on all the chips power supplies.
With CMOS (low current) and low frequency stuff it should not be a problem
but you never know.

Jay S.


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Richie Burnett
Sent: Saturday, April 25, 2015 3:03 PM
To: florian anwander; SDIY List
Subject: Re: [sdiy] 4051 spikes

...could also possibly be something caused by ground-bounce.  I don't see 
your scope-probe grounding crocodile clips clipped onto the ground rail of 
your breadboard :-p