Why does a PC need 12V?
On Fri, 30 Aug 2002 10:14:18 -0400, you wrote:
> does it generate +/-12V (like a MAX232 for example)?
> If I need to supply it, and decide not to use serial
> comms, then can I just ignore it? Probably - the only possible issue I can think of may be to do with
continually asserted ring interrupts.
> Or can I just supply
> it with +/-5V (as an RS423 device) and make sure the
> other end handles that level?
Possibly. May be easier to remove the RS232 driver and replace it with
MAX232 etc. +/-8v would probably work fine.
>- COOLING FAN:
> - I can always get or modify the fan for 5V use, or I
> could generate 10-ish volts for that. So no prob
>- AUDIO CARD:
> - I believe line-out sound levels go to 10V, so +/-12V
> is probably needed there. Any way around this?
You may get away with less than 12V, as this is likely to give
headroom for the analogue stuff.
>Anything else I'm missing?
There may be things that use the 12V rail to get a clean 5v supply,
but 8v or so ought to do here. Probably most likely on audio or video
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