Path: utzoo!utgpu!utstat!jarvis.csri.toronto.edu!mailrus!sharkey!atanasoff!jwright
From: jwright@atanasoff.cs.iastate.edu (Jim Wright)
Newsgroups: comp.sys.amiga
Subject: Re: pd digitizer ...
Summary: ADC0804 + LM386N + misc = noise ?
Message-ID: <968@atanasoff.cs.iastate.edu>
Date: 8 Apr 89 02:01:41 GMT
References: <3415@nunki.usc.edu>
Reply-To: jwright@atanasoff.cs.iastate.edu (Jim Wright)
Organization: Iowa State U. Computer Science Department, Ames, IA
Lines: 18

In article <3415@nunki.usc.edu> wdao@castor.usc.edu (Walter Dao) writes:
| SO , the digitizer was a B I G disapointment. 
| Yes, it does work, but the sampled sound sounds like an old 1920 scratched 
| disk that survived the blitz on london during WW2.

I've built a couple of these, making changes and trying to figure out
how to get it to work well.  I had a wave generator hooked up providing
a clean stable sine wave, and a scope to poke around inside the bugger.
I turns out that the noise is generated only when the Amiga is monitoring
the device.  My guess is that the ACK-type signals sent into the 0804
ADC are the source of the noise.  Unfortunately, the equipment here
is all Fred Flintstone Signature Series stuff (i.e. old).  Add that to
the fact that I'm a software kinda guy, and I'm lost.  Anybody have
better results?

-- 
Jim Wright
jwright@atanasoff.cs.iastate.edu