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about numeric keyboard questions?

Discussion in 'Electronic Basics' started by nick, Feb 21, 2004.

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  1. nick

    nick Guest

    i use many diodes to make a numeric keybord , total are 12 keys,the
    keys connect to other ICs when i connect DC9v to this circuit , and
    press the key
    i divcover become less 9v but the ic need 9v to operate , Are the keys
    make potential difference in the circut how to solve this problem, to
    provide a stable voltage to the circuit when i press the keys?

    thanks
     
  2. the Wiz

    the Wiz Guest

    There is a voltage drop across each diode that is in the circuit when a key is
    pressed, typically from 0.2 to 0.6 volts depending on the type of diode.


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