by "J.Koning" <mynamespacedbydots@[EMAIL PROTECTED]
>
Apr 23, 2008 at 11:35 PM
"Eeyore" <rabbitsfriendsandrelations@[EMAIL PROTECTED]
> wrote in message
news:480F9C42.B9CF7B62@[EMAIL PROTECTED]
>
>
> Iain Churches wrote:
>
> > "J.Koning" <mynamespacedbydots@[EMAIL PROTECTED]
> wrote
> > > "Iain Churches" <IainNG@[EMAIL PROTECTED]
> wrote
> > >
> > >> > I suspect the simplest way to go is just to ramp the heater
> > >> > voltage rather than limit the current actually.
> > >> > It'll be simpler to make and have a lower overhead.
> > >>
> > >> How should this be done?
> > >>
> > >> Iain
> > >
> > > [...]
> > >
> > > See: "slow turn on regulator", page 15.
> > > http://www.national.com/ds/LM/LM117.pdf#page=1
> > > For better availability use the LM317 equivalent.
> > >
> > > [...]
> > > to unsnip see my yesterday post.
> >
> > Thanks Jan. I had not realised that Graham was
> > referring to the same ideas for which you had
> > already posted the links:-)
>
> It strikes me as the simplest and most practical solution. R2 would want
> to be 1.1k using the schematic shown.
>
> Graham
>
With fresh batteries in my brain prosthesis
for R2=1k1 (& R1=240) I find Vo to be about 7V.
Another set of fresh batteries shows R2 would
want to be 970 ohm using the schematic shown.
Regards,
Jan
