Quentin,

I have done exactly that - PWM which is then filtered using an RC circuit,
after which it is pushed through an LM324 in a non-inverting configuration
(powered off a single power supply).  The available PWM frequency is high
enough to get a very smooth analogue signal out with a reasonable time
constant, although reasonable is of course relative.

Cheers
 Roland
-----Original Message-----
From: Quentin <qsc@icon.co.za>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: 08 June 1999 15:15
Subject: [OT] need 10V D/A from PIC


>Hi
>I need to have a 10V analogue output. The digital is provided by a PIC.
>
>I was thinking of using either R2R or PWM with RC filter (AN655) and the
>amplify that signal to 10V.
>My concern is stability. Anybody got any ideas?
>Or,
>Can you suggest an IC that will do 10V D/A?
>
>Thanks
>Quentin
>