Jon . . . . 
What sort of signal are you concerned with ?  Is it a D.C. or A.C.  signal  ?
What is the signal voltage level ?  What is the signal frequency , if A.C. ?

If you are looking to simply pass a D.C. current , then a mosfet will have the lowest
*on* resistance , and drop very little of the signal.  However , once you have the 
other spec.'s  available it may be that  a * line-buffer* would serve your purpose.

Believe it or not the old  * MC1488 and MC 1489 * pair still serve some app.'s

Regards . . . . 
                        Steve 



-----Original Message-----
From: Jon Petty <Phxsys3@AOL.COM>
To: PICLIST@MITVMA.MIT.EDU <PICLIST@MITVMA.MIT.EDU>
Date: Thursday, September 30, 1999 9:16 PM
Subject: solid state switches for signal wires


>Hi everyone
>
>I need my PIC to intercept some sensor signals (when needed) and also have
>the ability to pass them through. I have used small relays for this before. I
>don't have the room on the board to put relays. We are talking small signal
>current less then 2mA.
>
>What kind of solid state switches are there that don't have a voltage drop. I
>don't want to affect the signal.
>
>I have never used bus drivers would something like that work? Could you
>recommend Part numbers?
>
>Any other ideas?
>
>
>Jon
>