[sdiy] OK, so...there's this guy...

[Ian Fritz]

It sounds like your friend is looking for a touch switch.  If that is the 
case, he certainly would *not* want synchronous detection, which would be 
used for an analog readout.  He should look at the CMOS Handbook, which has 
a number of circuits for this application.  I used one in my wind 
controller, and it may be found here:

http://home.earthlink.net/~ijfritz/st_cir5.htm

Good luck to your friend.

   Ian




At 11:46 AM 9/26/2003, Peter Grenader wrote:
>And let's say, for argument sake, that this guy is working of creating a
>logical true (high) when his finger is placed on a piece of conductive
>material, be it a small strip of metal or a coin, or anything with similar
>conductive qualities.
>
>And let's just say that he's got it to the point where a signal will in fact
>rise from ground to about 2 tenths of a volt, albeit one that's looks to be
>nothing more than amplified noise in that it's a somewhat messed up sine
>wave with a period of about 15 ms.
>
>And let's say, for argument sake, that this guy has tried a few tricks in an
>attempt to convert that to a linear DC level of .2 volts without success.
>
>What would you suggest I, I mean... *this guy*, try next?
>
>Any suggestions?
>
>thanks in advance,
>
>Peter