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How touchpads work?
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September 17th, 2008 22:20 #1 |
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robert_ak |
My Circuit Analysis prof mentionned this in class and I thought it'd be interesting to share: touchpads can be made using capacitors and basically when you put your finger on it, you change the capacitance at that point and the computer is notified. He also mentionned that there were op. amps. under that to amplify the signal and make sure not much current is at the interface (because that would be dangerous). more info: http://en.wikipedia.org/wiki/Touchpad ______________________ hai |
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September 18th, 2008 09:29 #2 |
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damaged |
interesting.. how many of those capacitors would you need in today's laptops?
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September 18th, 2008 20:50 #3 |
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robert_ak |
Quoting damaged:i have no idea ______________________ hai |
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September 18th, 2008 22:03 #4 |
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3hirty6ix |
I think it's over 9000. He also said that when I took the course. ______________________ o hi dere |
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September 19th, 2008 14:25 #5 |
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robert_ak |
Quoting 3hirty6ix:sup ______________________ hai |
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September 19th, 2008 21:44 #6 |
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DoomHammer |
Well, anyone with intelligence could have told u that. Op Amps and Capacitors are in every piece of modern technology.
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September 19th, 2008 23:57 #7 |
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damaged |
Quoting DoomHammer:actually, most chips use integrated circuits. having actual resistors or capacitors on circuits would make circuit boards huge. ______________________ |
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September 20th, 2008 21:50 #8 |
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DoomHammer |
baseline is the same though. Integrated circuits have the same systems but at really small scales for instance, they are currently working on a capacitor the size of an atom
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September 30th, 2008 00:21 #9 |
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tomzx user |
Quoting DoomHammer: Do you know what you're talking about? Do you think an atom can "charge" himself? Other than gaining other electrons in it's outer layer, making it unstable, there's no such thing. Back to trackpads, they aren't made of CAPACITORS, simply understand that wires makes capacitances simply because they aren't perfect thus they are small resistance and small capacitance at the same time (capacitance being in the Laplace domain. Now, you know that they are simply wires connected to ampli-ops which makes sure the signal is strong enough to be analyzed. ______________________ Techno-Science |
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September 30th, 2008 09:17 #10 |
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robert_ak |
Quoting tomzx:I'm pretty sure they have capacitors down there. How do you lay out wires in such a way that the computer can detect when you press on a wire?? 
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