[rescue] Perverse Question

Dave McGuire mcguire at neurotica.com
Sat Jun 7 18:46:54 CDT 2003

On Saturday, June 7, 2003, at 07:31 PM, Mike Hebel wrote:
> There is no 3.3V so yes you will need a regulator.
> The DC current output per the sheet is:
> +5V == 9A
> +12V == 2A
> -12V == .1A
> This data is for the Classic/LX power supply -Fuji PEX643-30 model.  
> 300-1101
> My advice would be obviously to take something like an LM7803(?) and 
> put in on one of the +5V lines to get your 3.3V.

   Is there a 3.3V member in the LM7800 family?  I've not seen that.

   I would suggest something like Linear Technology's LT1085 for a 
linear regulator:


   ...but watch out for heat.  A switching regulator would be far 
superior in this application, something like the LTC1148-3.3:


   These chips and their supporting components are usually available in 
small quantities through suppliers like DigiKey.


Dave McGuire             "I've grown hair again, just
St. Petersburg, FL           for the occasion."       -Doc Shipley

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