On 6/10/05, Bob Ammerman <rammerman@verizon.net> wrote:
> Try Googling for:
> 
> schematic analog multiplier


Old and cheap fashion solution for a multiplier is log A, logB, sum
between A and B and antilog the sum.
With a cheap AD PIC will be scaling-input A on AD, scaling-input B on
AD, multiplying output on the PWM, filtering.

vasile

> 
> I didn't look closely at the results, but they looked promising.
> 
> Bob Ammerman
> RAm Systems
> 
> 
> ----- Original Message ----- 
> From: "Todd Bailey" <tm_bailey@hotmail.com>
> To: <piclist@mit.edu>
> Sent: Thursday, June 09, 2005 6:08 PM
> Subject: Re: [EE] Analog "Proportional" Amplifier Design Question
> 
> 
> > Mike,
> >
> >  The equation you suggested is absolutely right -- that's exactly the 
> > function I want, although the circuit doesn't have to be single supply.
> >
> >  Further, to clear things up w/r/t an earlier suggested solution:
> > Vout isn't necessarily going into an ADC -- it might very well stay 
> > analog, so the output has to be linear.  Seems like it'd be totally doable
> 
> > with a few op amps -- is that true?
> >
> > Thanks again,
> >
> > Todd
> >
> > -------------------------------------------------
> >
> > Mike Hord wrote:
> >
> >
> > To clarify:
> >
> > Given Va, Vb, and Vc, with output Vout and single-rail supply Vdd:
> > Vout = [(Vb-Vc)/(Va-Vc)]*Vdd
> > where Va > Vb > Vc, right?
> >
> > Mike H.
> >
> > --
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> >
> >
> > -- 
> > http://www.piclist.com PIC/SX FAQ & list archive
> > View/change your membership options at
> > http://mailman.mit.edu/mailman/listinfo/piclist
> > 
> 
> -- 
> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
>

-- 
http://www.piclist.com PIC/SX FAQ & list archive
View/change your membership options at
http://mailman.mit.edu/mailman/listinfo/piclist