Path: utzoo!mnetor!uunet!husc6!bbn!rochester!PT.CS.CMU.EDU!andrew.cmu.edu!es1e+
From: es1e+@andrew.cmu.edu (Eric Lee Singer)
Newsgroups: sci.electronics
Subject: WANTED: Touch-Sensing Switches
Message-ID: <AVvb21y00XoFsvQ0y-@andrew.cmu.edu>
Date: 15 Jan 88 19:48:17 GMT
Organization: Carnegie Mellon University
Lines: 17


	In addition to the pressure sensors mentioned in a previous post, I need 
touch sensitive switches.  They should be:
	- about the size of a nickle
	- able to sense a finger touching the switch
	- not flaky, i.e. a clean on/off signal when you touch/untouch the switch

	I am considering making the contact part of the switch myself (perhaps 
cutting disks out of copper-clad PC board material and etching a pattern on 
them).  In that case, I need a (simple?) circuit for sensing a touch, 
debouncing, and amplifying to TTL level.  Does anyone have a circuit, or know 
of a good reference book for this info?  Or, does anyone know of an 
electronics supplier for switches like this?

	Thanks in advance,
	Eric Singer
	es1e@andrew.cmu.edu