Well, I found this...

http://www.maplin.co.uk/products/Module.asp?CartID=0207270744491441254&modul
eno=19160&modulecode=

It says it's a regulated 12V supply - could I use this (instead of a 13V
supply w/ 7812 regulator)?

----- Original Message -----
From: "Rick C." <rixy@VVALLEY.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, July 27, 2002 1:14 AM
Subject: Re: [PIC]: 12V supply for programmers


> Correct on the 78xx's. DC wall warts usually only have a diode and one
capacitor
> in them. Unloaded, they will put out 1.4 times the voltage stated on the
warts.
> I use 9vdc wall warts for programming modules such as the Warp13 and the
> Microchip ICD. 12 volt ones will work just fine too (which they are rated
for)
> but the 7805 may get a little hotter since they have no heatsink, but
they'll
> take it. Don't use a 15-18 volt unit because the regulators will get very
hot
> and may shut down. Besides, they'll leave a blister on your finger.
> Rick
>
> Kieren Johnstone wrote:
>
> > Thanks for your replies everyone :)  I think I'll build a thingywotsit
> > socket for use with a "walwart" (must be an American term!..).  My brain
> > tells me that a 7805 regulates to 5V, so a 7812 will regulate 12V.. is
it
> > lying?  Also, what would I actually have to get from the wallmart (above
the
> > 12V)?
> >
> > Ta
> > Kieren and his Fish
> >
> > ----- Original Message -----
> > From: "M. Adam Davis" <adampic@UBASICS.COM>
> > To: <PICLIST@MITVMA.MIT.EDU>
> > Sent: Friday, July 26, 2002 9:53 PM
> > Subject: Re: [PIC]: 12V supply for programmers
> >
> > > You should be able to get current/voltage curves for this device from
a
> > > few different battery manufacturers.
> > >
> > > The 12V value is known as the 'nominal' voltage, and the actual
voltage
> > > before discharge may be as much as a volt or two higher.
> > >
> > > If you can't get a dischare curve, then put the battery under load and
> > > measure it every so often to see how much current you can draw for how
> > > long before it drops below the necessary programming voltage.
> > >
> > > Chances are good that you won't be able to run the whole programmer
from
> > > it, but if you use it with a 4AA supply (4AA for the rest of the
> > > programmer, 12v for the MCLR) then you shouldn't have any problems.
> > >
> > > IIRC, most pics have a recommended programming voltage of 13.5 for
MCLR.
> > >  The ICD (original) documents has a simple PWM controlled voltage
> > > tripler that uses a few transisters, coils, diodes, etc for its
> > > programming voltage.  I would suggest you spend the extra doller for a
> > > handful of parts and derive the programming voltage from your other
> > > power supply (4AA, maybe.)
> > >
> > > -Adam
> > >
> > > Kieren Johnstone wrote:
> > >
> > > >Hi,
> > > >Just wondering, will a small 12V alkaline battery (it's about AA
size) be
> > OK for a 12V source for use in a PIC programmer - PARPIC, for example.
Or
> > should I go for the 8xAA (or 10xAA rechargable - they're only 1.2V!)?
Or a
> > car battery? :(
> > > >
> > > >Thanks,
> > > >Kieren Johnstone
> > > >
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