cheap A/D Converter (was Re: Occilliscope)

[Roger Heflin]

On Wed, 29 Jul 1998, Jason Weir wrote:

> Roger Heflin wrote:
> 
> > If you want to do some electronics and a computer, you can get a cheap
> >
> > A/D convertor (ADC820 I believe), and wire it into the paralell port.
> > You can do it without any extra circuitry except an external power
> > supply to power the A/D.  The convertor is good for 600khz (good
> > enough for auto use) and with a PC paralell port (on a 486 or so) you
> > can get at least 20 khz or so out of it with quick basic.  If you
> > use something more serious (C or Assembler) you can get closer to
> > 100khz out if it.
> 
> Not sure if this is what your talking about but its a simple A/D
> converter using the parallel port, check it out, probably cost about $10
> at radio shack...I was interested in using it to log O2, TPS, VSS and
> some other things but never got around to trying it yet, let me know
> how, if anything turns out,  Jason
> 
> http://www.repairfaq.org/filipg/LINK/F_AD4PC.html
> 
> 

Same idea, different convertor and different wiring than I did on the one
I had.  I have only breadboarded, I have not finished wirewrapping the
more durable circuit.

			Roger