Ah, now I understand!
You MUST raise the outputs of the regulators IF you are feeding voltage
AFTER THEM. In other words, the author is not providing the +/-25VDC or so
that the regulators normally get on their inputs, rather he is providing
somewhat lower voltages (+/-12VDC) than the regulators produce (+15,
-15VDC) and this WILL destroy the regulators if they are left in circuit.
Thus, IF you are providing the +12,-12VDC etc. substitute voltages, then
you MUST disconnect the outputs of the regulators.
John :-#)#
At 08:40 PM 4/19/2001, you wrote:
>Ok I Have a question now On the page
>http://www.geocities.com/SiliconValley/Horizon/2253/vectors.html
>It states
> >>The first thing you MUST do is to desolder/clip the outputs (pin 3) of
> the 7815
>(VR3) and >>7915 (VR1) regulators away from the PCB. If you do not, they
>will get
>HOT and be >>destroyed!
> This is just because the page author was feeding the board 12 volts
> rather then
>10, Right? or Am I missing something? Why would anyone really need to do
>all that
>hacking to put a display up on a scope?
>
>-=Mark=-
>
>
>Rod Spade wrote:
>
> > Bret Pehrson wrote:
> > >
> > > Specifically with Atari -- Star Wars and Major Havoc, is it safe to
> run the
> > > PCB with the monitor completely disconnected or can it cause problems?
> > >
> > > I'd like to work on the games using a scope for the output, and
> disconnect
> > > the monitor (at least the power) until I get the boards working
> correctly.
> > >
> > > The reason I ask:
> > >
> > > http://www.geocities.com/SiliconValley/Horizon/2253/vectors.html
> > >
> > > indicates that the regs output needs to be clipped.
> >
> > I think he just did that so he could use an alternate power supply for
> > the board - but I'm certainly not an expert.
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>
>
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Received on Fri Apr 20 00:50:38 2001
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