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Touch Sensor vs ESD?

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LAN_403

ScotchTapeLord

Sat Nov 20 2010, 11:43PM

Registered Member #1875 Joined: Sun Dec 21 2008, 06:36PM
Location:
Posts: 635

So lately I've been making plans for a touch sensor. Nothing fancy, just a resistor in series with a capacitor that charges up when someone touches one end of the capacitor.
I figure that if I built up a charge, I could easily destroy the uchip that is monitoring the voltage across the capacitor or the capacitor itself (I'm a bit more concerned about the chip and any other IC that I might have on its board). What kind of protection could I implement to help make my circuit more immune to ESD?

How do laptop and ipod touch pads cope with this harsh element of reality?

Pinky's Brain

Sun Nov 21 2010, 01:47AM

Registered Member #2901 Joined: Thu Jun 03 2010, 01:25PM
Location:
Posts: 837

TVS/avalanche diodes.

radiotech

Sun Nov 21 2010, 07:54PM

Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546

Google NE77 lamp, or find the GE Neon lamp manual on line.

These touch sensor were used for elevator buttons to replace the
heat sensor kind that some genius invented.

Also see touch sensor lamp modules using triacs.

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