Just an idea

But how about using a reactive power supply and measuring the voltage on the
primary side with say a 12F675. You can scale the voltage with "resistive
dividers" using neutral as the ref.

You can then transfer the data to the secondary using an opto.

Thys

-----Original Message-----
From: pic microcontroller discussion list
[mailto:PICLIST@mitvma.mit.edu]On Behalf Of Micro Eng
Sent: 18 June 2003 14:09
To: PICLIST@mitvma.mit.edu
Subject: Re: [EE]: Monitoring mains voltage?


Take a look at analog devices.  They have a family of parts dedicated to
monitoring both voltage and current (and resulting power) of AC mains.  It
is designed for meter bases.

Also, Cypress has an app note and kit (?) using the PSoC controller for much
the same thing.  I'm not positive on this, just saw it on the web page.
Maybe Andy can shed some light, or someone else on the list.

Bottom line is...isolation is important.

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