> -----Original Message-----
> From: Mike Singer [SMTP:msinger@POLUOSTROV.NET]
> Sent: Tuesday, May 13, 2003 10:47 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]: Peltier cooler question
>
> Olin Lathrop wrote:
> ...
> > PWM can still be used to create the analog level, but it
> > should be filtered so that the ripple at the Peltier device
> > is small compared to the maximum voltage.  A better scheme
> > is to filter the PIC PWM output to make the reference signal
> > for a switching mode current source.
>
>    Also PIC with few resistors will make the reference
> signal. Eight levels are more then enough in my opinion.
>
>    Mike.
>
That depends totaly on the OP's application.  Our products use TEC's that
must be controlled to very small temperature deviations, certainly less than
0.1C.

Mike


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