I know for a fact that there is a circuit in our lab that uses a 7805 and it
has been connected to a 5 V supply oon the output side of the reg for at
least a couple of years with no adverse affects.  Wouldn't recommend it
though out of principle.

Mike

> -----Original Message-----
> From: Alan B. Pearce [SMTP:A.B.Pearce@RL.AC.UK]
> Sent: Thursday, November 02, 2000 9:08 AM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [PIC]: PicPocket
>
> >BTW, anyone got a good feel for how a v.reg reacts when you
> >power it up from the wrong direction - or otherwise drive its
> >ouput node higher than its input node?
>
> 7800 and 7900 series ones I had occasion to do this to put their legs in
> the air
> in disgust and died.
>
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