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Thread: Another touch switch question

  1. 27th March 2009 08:18 PM #1
    twist2b
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    Default Another touch switch question

    So I see complicated switches, and easy cheesy switches :P

    Simple Toggle Touch Switch Using Two Inverter Gates | Free Circuit Diagram

    SO I thought this was genius for simplicity.
    Though wondering how well it would work.

    What I am looking for:

    I need an ON/OFF for each time you touch it. Touch let go... on... touch let go... off. I have seen way to many schematics that just turn on WHILE your touching it.

    My project is connected to 120VAC so I am looking for continuous red LED while its off. Then when it turns on the red LED turns off.

    My HOPE was to be able to use a clear plastic with LEd behind it and the plastic IS the material you touch.




    Looking around google shows flip-flops as a popular option....
    So many freakin ways to do it, its so hard to decide the best path to take, so just asking for some advice.

    Thanks.
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  2. 27th March 2009 08:25 PM #2
    Sceadwian
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    Latching push button momentary. Old AT power supplies used them as power switch for mains voltage so if you can find an old AT power supply it'll have one attached. I have a few in my parts bin. You can buy them from a site Digikey.com for spare change.
    Last edited by Sceadwian; 27th March 2009 at 08:26 PM.
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  3. 27th March 2009 08:37 PM #3
    twist2b
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    Quote Originally Posted by Sceadwian View Post
    Latching push button momentary. Old AT power supplies used them as power switch for mains voltage so if you can find an old AT power supply it'll have one attached. I have a few in my parts bin. You can buy them from a site Digikey.com for spare change.
    No, I have built many latching switches... thats not hard....
    I just want to have a TOUCH controlled switch.
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  4. 27th March 2009 09:55 PM #4
    ccurtis
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    The touch circuit looks solid enough, for a touch switch. Did you build it yet? Should take a matter of minutes to build.
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  5. 28th March 2009 12:08 AM #5
    Sceadwian
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    twistb last time I checked a button was a 'touch' I didn't take a look at your touch sensor circuit you need to be a little more specific =) If you want to latch the button output you can feed the input into a flip flop. That touch sensors is going to rely on slightly moist fingers and won't work with gloves or any non conductive touch. Very dry skin might not trigger it.
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  6. 28th March 2009 05:04 AM #6
    audioguru
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    I think that static electricity from a finger will destroy the first inverter that has no protection.

    The circuit will not work if a person has very dry skin or is wearing gloves.
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  7. 28th March 2009 09:55 AM #7
    Sceadwian
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    Is that what the 1n cap to ground is for is static protection?
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    straight answer, har har."
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