[sdiy] Fw: Reference stabilizes exponential current

[harry bissell]

If you were a REAL American you would blame
Afghanistan....   ;^P

H^) harry


--- Jim Patchell <patchell at silcom.com> wrote:
>     Sort of my mistake.  At the top of the page, in
> large print, it says:
> "Edited by Bill Travis"
> 
>     And below that, in smaller print it says:
> 
>     Tom Napier, North Wales, PA
> 
>     Without my glasses, I could plainly see the Bill
> Travis name, well, actually
> even with my glasses...but, like a true American, I
> will blame this mistake on
> EDN rather on myself for not carefully reading the
> attribution... :-)
> 
>     -Jim
> 
> harry bissell wrote:
> 
> > BILL TRAVIS circuit ???
> >
> > This is a problem. The circuit was by Tom Napier,
> > North Wales, PA.
> >
> > Bill Travis (while a good enough guy) is an
> > EDITOR at EDN, not the designer.
> >
> > I did not see the online version but if you did...
> > and it attributes this design idea to Bill
> Travis...
> >
> > PLEASE contact EDN immediatly and request they
> publish
> > a correction (because its wrong) and an APOLOGY...
> >
> > because this is not the first time they've done
> this.
> > I have contected them in the past. They should
> KNOW by
> > now...
> >
> > H^(  harry   (un-Happy)
> >
> > --- Jim Patchell <patchell at silcom.com> wrote:
> > >     What he did is not all that different from
> > > experments that I have done, as
> > > well as JH did.  The output of IC3 is
> proportional
> > > to temperature, and can be
> > > used to control the gain of the expo driver. 
> The
> > > methodes that JH and myself
> > > use don't require an extra transistor in expo
> array
> > > so that they could be used
> > > with just matched pairs.  However, I have to
> say, if
> > > you are going to be using a
> > > DAC to set the pitch of your VCO, the Bill
> Travis
> > > circuit does have a certain
> > > apeal.
> > >
> > > Craig Critchley wrote:
> > >
> > > > The author of this article must be a nut for
> > > different ways to build an
> > > > exponential converter.  I thought the name
> looked
> > > familiar from a recent
> > > > Circuit Cellar article, from the September
> issue,
> > > and sure enough the name's
> > > > the same.
> > > >
> > > > In the Circuit Cellar article, he uses two
> > > additional transistors in a
> > > > ca3046 to heat the chip to a constant
> temperature.
> > >  In that article it was
> > > > driving a 74hct4046 vco.  He claimed 4 decades
> of
> > > accuracy for it.
> > > >
> > > > It doesn't look like this article is online
> yet,
> > > but the Circuit Cellar
> > > > archive only goes up to Aug. so maybe it will
> be
> > > available later.
> > > >
> > > >                             ...Craig
> > > >
> > > > ----- Original Message -----
> > > > From: "Michael Lloyd" <mlloyd1 at enteract.com>
> > > > To: <synth-diy at dropmix.xs4all.nl>
> > > > Sent: Wednesday, October 31, 2001 6:20 PM
> > > > Subject: [sdiy] Fw: Reference stabilizes
> > > exponential current
> > > >
> > > > ----- Original Message -----
> > > > From: Michael Lloyd
> > > > To: mlloyd
> > > > Sent: Wednesday, October 31, 2001 2:59 PM
> > > > Subject: Reference stabilizes exponential
> current
> > > >
> > > >
> > >
> >
>
http://www.e-insite.net/ednmag/index.asp?layout=article&stt=000&articleid=CA
> > > > 178103&pubdate=10/25/2001
> > >
> > >
> > >
> >
> > __________________________________________________
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> 
> 
> 


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