Help with integrating 2 relay triggers

Discussion in 'General Electronics Chat' started by FGLABACH, Jun 11, 2011.


    Thread Starter New Member

    Jun 7, 2011
    This is a pretty simple question so I am embarrased to ask. I have two triggers that when "off" are at zero volts and when "on" are at 5 volts. They share a common ground. I need to convert it to an ouput that when both are "on" it is 5 volts and when only one is "on" it is 0 volts. It does'nt really matter whether the "on" voltage is 5 volts or higher. I just need to have the voltage when only one is "on" to be near 0 volts. I need this ouput to drive a relay circuit that already has a tansistor driver so I do not need much current. I need this circuit very simple because I don't have much room in the chassis.
  2. #12


    Nov 30, 2010
    It's called an "and" gate. There are several ways to implement it, from single transistors, to opamp circuits, to chips with an array of and gates.

    google "and gate" and see various ways to do it.

    ps, if you want the output inverted, it's called a "nand" gate.
    Last edited: Jun 11, 2011