Am I the only person who has just received multiple copies of this email ??

----- Original Message -----
From: "Dave King" <KingDWS@HOME.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Friday, November 09, 2001 4:22 PM
Subject: Re: [EE]: PIC overheating a 7805 !


> Sometime you gotta love this list. Sometime people go right out and let
the
> smoke
> out of their bits long before your iron is hot. That and someone blurts
out
> things that
> save time n money.
>
> Just so I'm on topic slightly. We never design anything with a 7805 that
> doesn't
> have a head voltage in the 3-5 range. Preferably 3 if its going to pull
> near rated
> current. I have run one with 18.5 head and it ran red hot even with a huge
> sink on
> it. It was one of the least reliable designs I let out.
>
>
> >Maxim has some nice regulator chips that are pretty inexpensive - on a
> >production board, a power supply using these chips would cost you about
as
> >much as a 7805 and you don't have the heat issues (and if you are running
> >from batteries, the circuit will run a *lot* longer).
> >
> >myke
>
> Now this just made my day. I had a quick look at some of Maxims stuff and
> found
> one of these that eliminates me having to design two separate power
supplies.
> I can heat sink it for worst case and laugh.
>
> You know I think I've learned two things from this list this month. That's
> almost scary ;-]
> As a direct result I didn't have to think nearly as hard and can now
afford
> to kill off
> those extra brain cells with beer this weekend.
>
> Cheers
>
> Dave
>
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>
>

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