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Simple DPDT circuit

Discussion in 'Electronics Homework Help' started by infernowheels, Jul 20, 2015.

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  1. infernowheels

    infernowheels

    17
    0
    Jan 3, 2015
    Hey guys, we were asked to create an incomplete schematic diagram(no source and no ground) utilizing DPDT switches that simply connect inputs(Common) to a certain output.

    First problem:
    Position 1 of the switch:
    Input A is connected to Output C while Input B will be connected to Output D.
    Position 2 of the switch:
    Input A will now be connected to Output D while Input B will be connected to Output C.

    Second problem:
    Position 1 of the switch:
    Two LEDs in Series will activate.
    Position 2 of the switch:
    The Two LEDs will still activate but now in Parallel.

    Any help, even a hint would greatly appreciated!
     
  2. Harald Kapp

    Harald Kapp Moderator Moderator

    11,799
    2,749
    Nov 17, 2011
    Problem 1 hint:
    1. 1 relay DPDT will be required (alternatively 2 relays SPDT)
    2. Inputs A and B are connected to the common pin of a switch group (3 pins per group: common,. n.o., n.c.)

    Problem 2 hint:

    Again 1 DPDT relay is required.
    1. LED 1 is connected e.g. anode to V+, cathode to common of first switch group
    2. LED 2 is connected e.g. cathode to V-, anode to e.g. n.c. contact of second switch group
    From there on you should be able to find the solutions by yourself. Show us your schematics to verify them.
     
  3. infernowheels

    infernowheels

    17
    0
    Jan 3, 2015
    Refer to attached file. Not quite confident with my work though :<
     

    Attached Files:

  4. Harald Kapp

    Harald Kapp Moderator Moderator

    11,799
    2,749
    Nov 17, 2011
    You should be, though.
    Perfect - with a grain of salt: The symbol with the three separate dashes used in circuit 2 is (almost) never used for V+, only for ground, earth and such. As V+ is not often ground, avoid using this symbol.
    In every case avoid using this same the same symbol twice for different voltages (here: GND and V+).

    By the way (unrelated to the task you have solved well): LEDs should never be connected to a voltage source without some means of current limiting, e.g. a resistor.Want to know more? Read our ressource.
     
    Martaine2005 and infernowheels like this.
  5. infernowheels

    infernowheels

    17
    0
    Jan 3, 2015
    Many thanks kind sir!
     
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