100v AND gate

Discussion in 'General Electronics Chat' started by maitranirban, Dec 1, 2012.

  1. maitranirban

    Thread Starter New Member

    Dec 1, 2012
    1
    0
    Hi,

    We are trying to design a circuit in which input varies from 5 to 100V which will be further used in AND gate. Can anybody help providing the commercially available IC / any other solution? Thanking in anticipation.
     
  2. timescope

    Member

    Dec 14, 2011
    298
    44
    A diode - resistor AND gate is one solution. Other solutions would require more details about the required output, if it is possible to attenuate the input signals before the AND gate etc.

    Timescope
     
  3. crutschow

    Expert

    Mar 14, 2008
    13,053
    3,244
    A 20:1 resistive divider could reduce the 5V-100V to 0.25V to 5V, which standard CMOS logic gates operating from a 5V supply will interpret as logic low and logic high.
     
  4. Ron H

    AAC Fanatic!

    Apr 14, 2005
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    I interpreted the OP's statement as meaning that the input has a logic high that varies from 5V to 100V. I wonder which interpretation is correct.
     
  5. #12

    Expert

    Nov 30, 2010
    16,345
    6,830
    True. My first guess was a 39k, 1/2W resistor to a 5.1V zener as if to measure 0, (5V-100V). Clarification, please, and there is no such thing as a commercially available AND gate IC that will survive 100 volts.
     
  6. ScottWang

    Moderator

    Aug 23, 2012
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    The problem is that what is the 5~100V used for, and come from?
    If need the voltages to be a logical control signal, probably it need to use the resistors to dividing the voltages to the logical level as crutschow said, and use schmitt trigger IC as 74LS14, 74HC14, MC14584, etc, to changing the voltages level, and then connecting to AND gate.
     
  7. spinnaker

    AAC Fanatic!

    Oct 29, 2009
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    Frankly I wouldn't worry about it until the OP posts back. Dollars to donuts OP will not be back.
     
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