Op-Amps - Comparitor Wiring

Discussion in 'General Electronics Chat' started by IGill, Jan 6, 2013.

  1. IGill

    Thread Starter New Member

    Jan 5, 2013
    This is probably a very basic question which may make many of you laugh.

    When using an 8 pin dual comparitor such as a LM393, do you need to connect pin 4 and 8, ie Vcc+ and Vcc-?

    Most of the circuit diagrams that I look at only show connections to the, Output, Inverting input and Non-inverting input. Is this because I am an idiot and it is obvious that you connect Vcc+ and - and it is taken as read, or does it depend on the application?

    I am looking to include a comparitor in a op amp differentiator circuit.

    Any assistance would be appreciated.
  2. WBahn


    Mar 31, 2012
    Yes. These are the power supply connections. It's like asking if the television has to be plugged in to work.

    Yes, it is "obvious", but that doesn't make you an idiot, just not experienced enough for this to obvious to you. Power and ground connections are frequently not shown on schematics in order to reduce the clutter. Those connections are shown elsewhere on the schematic, often times with the local bypass capacitors shown at that point, as well.
    IGill likes this.