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RE: dc-dc converters +12V -12V for ISA sound card

There are +ve to -ve voltage convertors such as the ICL7660 which could
switch your +12v to -12v (might be worth checking Vmax, though).  They're
low current devices, not more than a few mA, and aren't regulated so the
output voltage will vary under changes in load.  However, if you're looking
for a couple of mA or less, they're small and cheap.

Regards,

Philip

> -----Original Message-----
> From:	 [SMTP:]
> Sent:	Wednesday, November 07, 2001 8:16 AM
> To:	
> Subject:	dc-dc converters +12V -12V for ISA sound card
> 
> Hi everyone,
>  
> As I mentioned before I would like to use an ISA sound card on the PC/104
> bus of an embedded motherboard. I was reminded (I apologise I foget by
> whom) that although PC/104 is electrically identical to ISA signal-wise,
> it does not supply +12V (or presumably -12V) required for ISA sound cards.
>  
> The current draw is relativly low, so a 5V to 12V tiny DC-DC converter
> solves the +12V problem, is there such a thing as a 5V to -12V or -5V to
> -12V DC-DC converter to handle the -12V? Does it go under a different name
> because I can't see any here. Or can I use a 5V to 12V one backwards on
> the -5V to produce -12V?
>  
> Regards,
>  
> Nick

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