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Electronics Touch Control Panel Design : New Schematic 05-02-2005 - NEED FEEDBACK

Discussion in 'Modding' started by technomancer, 17 Apr 2005.

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  1. mottl3y

    mottl3y What's a Dremel?

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    looks like i was wrong then :D cheers folks.
     
    mottl3y, 28 Apr 2005
    #41
  2. theshadow27

    theshadow27 What's a Dremel?

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    actualy, it depends what the aluminum is anodized with... if there is no clearcoat, some anodized aluminum will conduct.
     
    theshadow27, 28 Apr 2005
    #42
  3. technomancer

    technomancer What's a Dremel?

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    Radical thread detour :D

    Anyways, I took my last final this morning, so I should have the revised schematic for the led circuit using transistors online tonight at some point. :rock:
     
    technomancer, 28 Apr 2005
    #43
  4. technomancer

    technomancer What's a Dremel?

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    (Hopefully) Final QT140 LED Activation Circuit

    Ok, here's the revised schematic using transistors. The part names are links to the data sheet for that part (where I have one). Please look this over and comment guys, I want this thing to work :D

    The LED powered from standby will be the indicator for the power switch (the only one that should illuminate if the machine is off, if you think about it).

    [​IMG]

    Parts list:
    Diagram# : Description : Man. Part # : Digikey Part #
    Duh : Quantum Research QT140-D : QT140-D : 427-1059-ND
    XT1 : ECS 10MHz Resonator : ZTA-10.00MT : X915-ND
    Cs1-Cs4 : EPCOS 22nF Capacitor : B37981M5223K054 : 495-1067-1-ND
    Cs5 : EPCOS 0.1uF Capacitor : B32922A2104M : 495-1617-ND
    R1-R5 : Panasonic 10K Ohm Carbon Film Resistor : ERD-S2TJ103V : P10KBACT-ND
    R6-R9 : Panasonic 91 Ohm Carbon Film Resistor : ERD-S2TJ910V : P91BACT-ND
    Tr1-Tr4 : Fairchild PNP Transistor : PN3640 : PN3640-ND
     
    Last edited: 13 Jun 2005
    technomancer, 29 Apr 2005
    #44
  5. theshadow27

    theshadow27 What's a Dremel?

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    one prob, when the computer turns on, 5vsb goes to 0v. just a heads up. ill look it over agein in school where i have time
     
    theshadow27, 29 Apr 2005
    #45
  6. technomancer

    technomancer What's a Dremel?

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    Not according to the ATX power supply specification:

    p.25
    "+5 VSB is a standby supply output that is active whenever the AC power is present. It provides a power source for circuits that must remain operational when the five main DC output rails are in a disabled state. Example uses include soft power control, Wake on LAN, wake-on-modem, intrusion detection, or suspend state activities." :thumb:

    Wish I had a multimeter to check it on a spare power supply I have here... ah well, I can test it with an led when my resistors come in.
     
    technomancer, 29 Apr 2005
    #46
  7. technomancer

    technomancer What's a Dremel?

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    Control Buttons Schematic

    Ok, this is the schematic I've worked out for the control buttons. Thanks to cpemma for his flip flop schematic, which I've adapted and incorporated into this circuit. Bear in mind I'm an electronics n00b, so if I screwed something up please tell me :D

    [​IMG]

    Links in the parts list lead to pdf datasheets for the part.

    Parts list:
    Diagram# : Description : Man. Part # : Digikey Part #
    duh : Quantum Research QT140-D : QT140-D : 427-1059-ND
    XT1 : ECS 10MHz Resonator : ZTA-10.00MT : X915-ND
    Cs1-Cs4 : EPCOS 10nF Capacitor : B37982N5103M054 : 495-1078-1-ND
    Cs5-Cs8 : EPCOS 0.1uF Capacitor : B32922A2104M : 495-1617-ND
    R1 : Yageo 10K Ohm 1/4W Carbon Film Resistor : CFR-25JB-10K : 10KQBK-ND
    R2 : Yageo 1M Ohm 1/4W Carbon Film Resistor : CFR-25JB-1M0 : 1.0MQBK-ND
    R3 R5 : Yageo 1K Ohm 1/4W Carbon Film Resistor : CFR-25JB-1K0 : 1.0KQBK-ND
    R4 : Panasonic 100K Ohm 1/4W Carbon Film Resistor : ERD-S2TJ104V : P100KBACT-ND
    Tr1 : Fairchild PNP Transistor : PN3640 : PN3640-ND
    FF1 : Fairchild IC Dual Flip Flop : CD4013BCN : CD4013BCN-ND
    Mos1 : ST Micro N-channel MOSFET : IRF530 : 497-2780-5-ND
     
    Last edited: 13 Jun 2005
    technomancer, 3 May 2005
    #47
  8. One~Zero

    One~Zero What's a Dremel?

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    Technomancer...looking really great :rock:
    Can't wait to see how yours looks all put together.
    One question: Are the caps on the crystal .1uf as well....or?
     
    One~Zero, 3 May 2005
    #48
  9. technomancer

    technomancer What's a Dremel?

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    See, told you I was a n00b, I completely left them out :wallbash:

    According to the resonator data sheet for a 5v circuit they should be 30pF caps.
     
    technomancer, 3 May 2005
    #49
  10. theshadow27

    theshadow27 What's a Dremel?

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    im just sayin that i was in my comp with a DMM and i when the computer was off there was +5v there, and when it was on it was 0 ohms with ground...

    maybe my PSU is wacko. ive only tried it on 1 pc
     
    theshadow27, 3 May 2005
    #50
  11. technomancer

    technomancer What's a Dremel?

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    I'll check it on the shuttle psu I'll be using when I get it... if that's the case I'm screwed, as figuring out some freaky switching power stuff is just beyond where I want to go with this. I'm already REALLY pressing my electronics/soldering skills as it is :D
     
    technomancer, 3 May 2005
    #51
  12. Jhonbus

    Jhonbus What's a Dremel?

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    If the +5vsb line does go to 0v when power is on, couldn't you just er, use 2 diodes and connect it to both?

    I cant wait to see how this turns out, I want to use something similar for a mod I have in mind...
     
    Jhonbus, 3 May 2005
    #52
  13. One~Zero

    One~Zero What's a Dremel?

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    0 ohms or 0 volts?
     
    One~Zero, 3 May 2005
    #53
  14. Jhonbus

    Jhonbus What's a Dremel?

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    ^either would do.
     
    Jhonbus, 3 May 2005
    #54
  15. technomancer

    technomancer What's a Dremel?

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    Damn you for spoiling my melodrama :lol:
     
    technomancer, 3 May 2005
    #55
  16. theshadow27

    theshadow27 What's a Dremel?

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    :worried:

    way to be smart lol
    i was going to say something stupid like a 12v relay and a realy big capacitor...
    :duh:
     
    theshadow27, 3 May 2005
    #56
  17. technomancer

    technomancer What's a Dremel?

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    Just a quick update, I'll be testing my power supply to make sure it's actually ATX spec compliant this weekend. If it is I'll be ordering the parts for this thing, if not I'll be revising the schematics again to use both +5VSB and +5V from a molex, then ordering the parts :naughty:

    After the parts get here from Digikey the real fun begins :dremel:
     
    technomancer, 6 May 2005
    #57
  18. bwgames

    bwgames Minimodder

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    Just a by the way, what I can see from reading the datasheet is that your 10mhz crystal means a 99ms response time - you might want to get some 5/20mhz crystals in case you later find you need to adjust the response time...
     
    bwgames, 8 May 2005
    #58
  19. bigal

    bigal Fetch n Execute

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    on another note, i have been using some QT110's here with a great design of sensor, like lots of circles on inside the other ... hard to describe, but 6cm diameter and you still get no proximity, virtually any thinckness of material but no proximity... so dont hold you breath if you plan to have it detect your hand 2 inches away or anything... :idea:
     
    bigal, 9 May 2005
    #59
  20. Ghlargh

    Ghlargh What's a Dremel?

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    I don't know how relevant this is anymore, but i have been using 5VSB for some projects, and it stays on the whole time on all supplys i've been using.


    And on the previous discussion: aluminum conducts electricity while aluminum oxide does not, and aluminum oxidizes fast in air. You can join copper and aluminum wire, this is done with special crimp connectors, in fact, all connections to aluminum wire or between aluminum wires has to be done by welding or different types of crimping since the oxide buildup prevents conventional connection methods. The aluminum wire i have seen has been terminated by tin plated copper crimp shoes, and aluminum wire is used in high current systems mainly because it can handle more current per weight unit than copper.

    Did you test what happens if you put some thin plastic film (office tape for exaple) on the sensor? does it detect through that or do you need direct contact with the finger?
     
    Ghlargh, 10 May 2005
    #60
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