where should i connect the 3v battery connection in relay

Discussion in 'General Electronics Chat' started by anju_a_sagar, Dec 26, 2007.

  1. anju_a_sagar

    Thread Starter New Member

    Dec 26, 2007
    Hi Everyone,
    I am using the following relay
    http://www.maplin.co.uk/Media/PDFs/N17AW & N18AW.pdf
    I m giving the 5V dc supply to the relay pins 1 and 16.
    i read that if it is DPDT (Double pole double throw) it can be used as forward, off and reverse direction..I have searched from the internet how to connect

    but i m not getting it properly...can u suggest some solution or Can anyone suggest where the battery connections (3V battery on which motor operates)will go so that the motor should operate on relay in reverse/forward direction.(Please help by mentioning the pin numbers)
    Many thanks
  2. thingmaker3

    Retired Moderator

    May 16, 2005
    There has been a misunderstanding. A single relay cannot do that. Relays do not have a "center off" position as many DPDT switches do. You would require one relay for "on/off" an a second relay for "foreward/reverse."
  3. SgtWookie


    Jul 17, 2007
    As thingmaker3 mentioned, your relay does not have a "center off" position. It CAN be made to reverse the direction of your motor, but you would need something else to control the speed or disconnect the power before switching direction.

    Pin diagram:
    Code ( (Unknown Language)):
    2.  1       4   6   8
    3. X1     COM1 NC1 NO1
    5. X2     COM2 NC2 NO2
    6. 16      13  11   9
    As you mentioned already, the coil connections are on pins 1 and 16. De-energized, pins 4 and 6 are connected, and pins 11 and 13 are connected.

    Wiring your DC motor: connect one wire (+ or red) to pin 4 (COM1), and the other (- or black) to pin 13 (COM2).

    Connecting power: connect your positive supply lead to pin 6, and your negative supply lead to pin 11. Then connect jumper wires from pin 6 to pin 9, and a separate wire from pin 8 to pin 11.

    When no power is applied to the coil, your motor will run in a forward direction. When power is applied to the coil, the motor will run in reverse.

    Reversing the direction of the motor while it is running at full speed will not be good for it.

    To turn the motor on and off, you will at least need a separate switch. To control the motor's speed, you could use a PWM circuit.

    A workable PWM circuit is here:
  4. anju_a_sagar

    Thread Starter New Member

    Dec 26, 2007
    thank-you very much indeed.
    many thanks