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opto coupler

Discussion in 'General Electronics Chat' started by z3ngew, Apr 19, 2013.

  1. z3ngew

    Thread Starter New Member

    Apr 18, 2013
    Hello everyone,
    I need to know, when i use the optocoupler (npn) i give a signal to the diode throw a resistor, and the transistor is switched on.
    ok, that's great but the question is can i connect the emitter to vcc and the collector to the output, maybe the base of another transistor.
    Thanks in advance,
  2. t06afre

    AAC Fanatic!

    May 11, 2009
    Just to be sure can you make simple schematic/drawing of what you plan to do :)
  3. Just_starting

    New Member

    Sep 25, 2012
    Simply yes. You can connect ground or VCC to one side of the output and use the other side as a signal so effectively creating an inverting or non-inverting, voltage independent line protector. I use this regularly.
  4. ScottWang


    Aug 23, 2012
    You adding a reverse voltage to the transistor, it could be damaged the transistor.

    For a NPN transistor of the optocoupler:
    Usually we adding the +Vcc to C and connecting a resistor from E to Ground, and the E will be the output.

    You can also connecting a resistor from +Vcc to C, and the E connected to Ground, and the C will be the output.