The PIC16F877 needs 2-5.5V.  I've never heard of a low-dropout regulator,
and my intro books just talk about voltage regulators like the 7805..  Is
there a simple (like, 3/4 pin) "drop-in" replacement that works like a 7805
(i.e. not too hard to use)?
When I say "LED rated 5V", I mean I went into my Maplin shop, asked for 8
5mm LEDs, the guy asked "what voltage" I said "well, 5" (they don't blow up
from 5v battery supply with no resistor).

Thanks,
Kieren

----- Original Message -----
From: "Karl Seibert" <karlseibert@SISCOM.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, July 18, 2002 9:30 PM
Subject: Re: [PIC]: Flashing LED Episode II (small attachment)


> Kieren,
>
> 6 V isn't enough to supply a 7805.  I forget how high of voltage
> it needs.  If you want to regulate 6 V down to 5 V, you need
> a low-dropout regulator.
>
> I don't know what you mean by an "LED rated 5 V".  Does that mean
> it has a built in current limiting resistor?  If it doesn't, you'll
> need some type of resistor.
>
> I don't have a PIC datasheet with me, so others will have to comment
> on other parts of the circuit.
>
> Karl
>
> Quoting Kieren Johnstone <misterfugit@HOTMAIL.COM>:
>
> > Hi,
> >
> > Got the code simulating right in MPLAB, anyone fancy checking the
> > circuit I've got planned? :)  Would be very helpful to me, thanks.
> >
> > -Kieren
> >
> >
> > P.S. Mini question - will in-circuit programming work without a 12V
> > power supply? I.e. with just the circuit shown, and the clock/data/mclr
> > pins hooked up in addition? Ta.
> >
>
> --
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>

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