Does it not use the non-linearity for multiplication. I am busy with a
Electricity meter design at the moment, but I don't think this will be
accurate enough for a product that must be certified.

George

----- Original Message -----
From: "Russell McMahon" <apptech@PARADISE.NET.NZ>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, October 24, 2003 3:03 PM
Subject: Re: [PIC]: Pic based wattmeter (I forgot the attachment !)


> > The only concern I see for these is the non-linearity of the LED versus
> the
> > supplied voltage. Not sure how the circuit gets around this.
>
> Plus lack of matching plus aging.
>
>
>         RM
>
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