> -----Original Message-----
> From: Dale Botkin [SMTP:dale@BOTKIN.ORG]
> Sent: Wednesday, October 30, 2002 4:00 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      [EE]: Power supply rework
> I don't see a compellign reason not to use a more modern voltage
> regulator, am I missing
> something?
>
> Dale
>
The only comment I would make is that your scheme throws away any current
limiting that the LM317 has.  What are the current requirements?  If the
LM317T is capable of supplying enough current (1.5 Amp ISTR?) then you could
put two in series with the first wired as a tracking pre-regulator.  I'm
almost certain the circuit is in the Nat-Semi datasheet.  Since LM317T's are
so cheap I'd always go for a scheme that has current limiting in if I could.

Regards

Mike

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