ok.. so I joined them together each ones on his gnd. now I have two points
that should be connected as one gng? finally al points will go to the PSU
ground?


SGNGs'  PGNDs'
* * * * * * * *
| | | | | | | |
+-+-+-+--+--+-+-+-+
           |
GND------+PSU ground

this is the way it should be?


Regards

Tal Bejerano
AMC - ISRAEL




-----Original Message-----
From: pic microcontroller discussion list


[mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Paul Hutchinson
Sent: Friday, May 24, 2002 4:54 PM
To: PICLIST@MITVMA.MIT.EDU
Subject: Re: [EE]: PGND SGND


Usually they are:
SGND = Signal ground
PGND = Power ground

It means the author wants you to keep the grounds isolated and join them
together at a single point only. This is quite often in sensitive analog
circuitry.

A Google search on "star ground" seems to give some good links.

Paul

> -----Original Message-----
> [mailto:PICLIST@MITVMA.MIT.EDU]On Behalf Of Tal Bejerano - AMC
> Sent: Friday, May 24, 2002 10:52 AM
> Subject: [EE]: PGND SGND
>
> What is the difference between SGND & PGND ?
> I found schematic that use +-15v and there is a points that
> marked with SGND
> & PGND, aren't the same?

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