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Design help to control 2 relays

Discussion in 'General Electronics Discussion' started by Glow, Jul 27, 2015.

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  1. Glow


    Jul 27, 2015
    Having 5vdc thru a momentary push button switch . How can I control the low side (Gnd .3A each) of two independent relays that acuatate in sequence as the button is pushed over and over ? Thanks glow
  2. Colin Mitchell

    Colin Mitchell

    Aug 31, 2014
    Use a 4017
  3. Alec_t


    Jul 7, 2015
    A CD4017 could be part of the solution. It can't provide enough current to drive the relays directly, but could be used to switch two N-type logic-level MOSFETS which, in turn, would drive the relays. Depending what the relays (current-hogging things!) are to be used for, you might even be able to dispense with them and use the MOSFETS to switch the load(s) instead.
  4. pgib8


    Jul 26, 2015
    I recommend NTD4963NT4G, but I'm not sure what you mean with "in sequence", a time delay?

    CDRIVE Hauling 10' pipe on a Trek Shift3

    May 8, 2012
    I would think that "In sequence" means one after the other.
    Like 1, 2, 3, 4 & back to 1, 2, 3, 4 etc. In his case OFF, 1, 2, OFF, 1, 2.
    As stated the 4017 is applicable.

    On the other hand, if one relay is always on while the other is off this can be done with a 555, which has enough juice to drive the relays directly. Though it's doubtful that Glow doesn't want a both relays OFF state. Which of course makes 3 required states.

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