Re: Turn on Apple to preserve it?

[Linards Ticmanis <ticmanis@gmx.de>]

Mike Willegal wrote:
> So what are the restrictions on the early Apple supplies.  I've been 
> thinking about the implemenation of a USB-Disk II interface.  One of the 
> issues is a power supply for a Disk II  (+5/-5/+12/-12).  One of easiest 
> solutions would be an Apple II supply, but I'm not sure if there is 
> enough current draw from an idle Disk II.  Any thoughts out there?

-5 is not needed at all as far as I can tell from the schematic, and -12 
only to bias the differentiator in the mc3470 amplifier, so current draw 
should be tiny.

Aren't there small components that can make -12 from +12?

--
Linards Ticmanis