1 Reply Latest reply on Aug 22, 2020 1:04 AM by jw0752

    How to drive a 5V relay with 3.3V ?

    Navadeep Ganesh U
    Navadeep Ganesh U Aug 21, 2020 11:37 PM

      Lot of modules and devices today run on 3.3V and they do not have 5V peripheral at all!

      How to drive a 5V generic relay with these?

      (are level shifters, boost converters an option?)

        • Re: How to drive a 5V relay with 3.3V ?
          jw0752
          jw0752 Top Member Aug 22, 2020 1:04 AM (in response to Navadeep Ganesh U)

          Hi Navadeep,

           

          Every spare USB battery has a circuit in it that converts the 3.7 volt battery voltage to 5V for USB power. These circuits are called DC to DC boost converters. You should be able to find a variety of them available on ebay. You will not need a very powerful one if all you want to energize is a relay. It will be a good idea to put a diode across the output so the spike from the relay coil doesn't damage the converter.

           

          John

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