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membrane switches

Discussion in 'Electronic Design' started by Raveninghorde, Nov 20, 2012.

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  1. I am working on a simple led membrane label.

    I have found the switch is more of a resistor dropping 200mV-300mV at
    14mA so 15 to 20 ohms.

    Googling I find metion of worst case switch resistance of 500 ohms.

    Looks like I need a FET to switch the current.
     
  2. TTman

    TTman Guest

    Why? you will no doubt need a series resistor anyway...
    OTOH, they don't last long with those sort of currents so use a FET...
     
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