From: David Wood (jbevren_at_starbase.globalpc.net)
Date: 2003-06-19 10:23:38
On Wed, 18 Jun 2003 wlevak@cyberspace.org wrote:
>
> I have checked the schematics again.
>
> The +5V from the 7805 is used only for the video circuits and the timer.
Agreed. rectified from the 9vac suipply right?
>
> The +5V on the joystick port is connected to the 5V on the external power
> supply. This is fused at 5A, so I don't think I would short it to ground.
you repeat 5A. What sort of power supply do you have? I remember my stock
psu having a modest 2-3 amps.
>
> The 9V AC is fused at 3A in the external power supply.
Not all PSUs have this 3A fuse inside them. My repairable one from
grapevine didnt, and I dont believe the brock psu (my 2-3amp 5v unit I have
in mind) did.
>
> There is an additional 1A fuse on the 9V AC line that feeds the 9V AC on
> the ussr port and the rectifier bridge that supplies power to the 7805.
-David
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