It's sort of a bonus, because as far as I can tell 13V adapters are "rare" -
only 12V then 15V are commonly used.  But still, does the "regulated 12V
adapter" mean I don't need a regulating circuit?  I just "connect the
terminals"?

----- Original Message -----
Wrom: DADRZFSQHYUCDDJBLVLMHAALPTCXLYRWT
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Saturday, July 27, 2002 8:13 AM
Subject: Re: [PIC]: 12V supply for programmers


> > (instead of a 13V supply w/ 7812 regulator)?
>
> If you look up the data for the 7812 you'll see, amongst other
> things that the recommended lowest input voltage to maintain
> regulation is 14.7V. Also, the best figure for through-current
> is when there is a 7V differential, ie when the input voltage is
> 19V. You won't do any harm by inputting at less than 14.7V
> but you'll find that in some circumstances you'll miss out on
> the benefits of using a regulator. It's worth getting a data
> sheet from one of the big producers, eg Motorola, Fairchild,
> National etc, as there are some application notes that will
> help you, for example jacking up and bypassing. Just Google
> for it
>
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>
>

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