[sdiy] Building the ASM-1 Noise Source

[Magnus Danielson]

From: "Roy J. Tellason" <rtellason at blazenet.net>
Subject: Re: [sdiy] Building the ASM-1 Noise Source
Date: Mon, 20 Dec 2004 18:14:33 -0500
Message-ID: <200412201814.33450.rtellason at blazenet.net>

> On Monday 20 December 2004 05:28 pm, mmanard at columbus.rr.com wrote:
> > I breadboarded the ASM-1 Noise Source:
> > http://home.swipnet.se/cfmd/synths/friends/stopp/asm1ns.pdf
> >
> > I built the White and pink noise portions so far.
> >
> > It's the first time I've actually breadboarded a circuit (as opposed to
> > using a premade PCB). The noise works (kinda) but there's 60cycle hum
> > that's pretty loud. I'm running on a MOTM powersupply. I assume a
> > groundloop but nothing I do changes it.
> 
> Don't assume,  it'll get you in trouble.  (Don't ask me how I know this :-)

Don't tell me, you *also* heard it from a friend? ;O)

"You assume to much!" is a sign everyone should have hanging over their desk,
their lab-bench and whatever. The really hard part about engineering and in
particular lengthy debugsessions is to methodically eliminate assumptions by
replaceing them with knowledge. Some of it can come from colleagues, books,
datasheets, app-notes where as others can only come in the form of new
observations and detailed recording of observations. What did one observe under
which conditions? What did *really* happend when one changed the conditions?

Cheers,
Magnus - who really should remind himself after a recent misshap (sunday lab session)