Re: sound card DAC

["Dean Franks" <dean-at-worlddigital.com>]

You would need to check the sound card.  Many have an A/C coupled output
section with a series cap to block anything below 5-10hz.  Sounds cards
would be an interesting way to generate PWM signals though... (especially
with 4 channel sounds cards available cheap)

Dean

----- Original Message -----
From: "bfp" <bfp-at-earthlink.net>
To: "Multiple recipients of list" <emc-at-nist.gov>
Sent: Sunday, March 12, 2000 3:59 AM
Subject: Re: sound card DAC


>
> Dave wrote;
>
> >While we are on this low cost track,  is it possible to read and write
> >DC voltages to a sound card ?
>
> Yes it is -BUT- only 8 bit values when writing directly to the sound cards
> D/A converter,to get 16 bits requires using DMA transfers.
> this could be a viable solution if you are willing to write the software,
> 2 of the older soundcards (not PnP) can be jumpered to co-exist in the
same
> box
> and are available dirt cheap at most any computer surpluss store
> of course you would still need servo amps,motors,digital
I/O,encoders,etc...
> so by the time youre ready to start pluging in cables the money saved by
> hacking a sound card will be more than eaten up by the added time and
effort
> used in geting it to work with the rest of the system, at least thats how
> I felt when I was looking into it
>
> Brian
>
> ref:
> http://www.neutralzone.org/home/faqsys/docs/sbdsp.txt
>
>
>