How to activate Relay?

Discussion in 'The Projects Forum' started by miniElectronics, Aug 8, 2009.

  1. miniElectronics

    Thread Starter Member

    Aug 4, 2009
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  2. KMoffett

    AAC Fanatic!

    Dec 19, 2007
    2,574
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    What is the part number on your relay? Is it a 5V?...12V?...24?
    Do you want the relay to be activated with a high out of the NAND gate or a low?

    Ken
     
  3. jj_alukkas

    Well-Known Member

    Jan 8, 2009
    751
    5
    Use an NPN transistor like BC337, BC548, SL100 and connect as follows.

    Emitter to GND
    Base to NAND output through 1-10k resistor depending upon supply voltage.
    Collector to relay terminal
    2nd terminal of relay to +12
    Also dont forget a reversely connected protection diode across the relay.

    What is your supply voltage? For 12v, use a 12volt 200 ohm relay. No of poles depends on your application.

    The above connections are for a high out which is what you need I guess. For a low out, Use a PNP and reverse connections.
     
  4. miniElectronics

    Thread Starter Member

    Aug 4, 2009
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    www.elfa.se
    Part number: 37-162-06

    Relay will be activated on high out of NAND gate.
     
  5. miniElectronics

    Thread Starter Member

    Aug 4, 2009
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    Supply voltage is 6V.
     
  6. jj_alukkas

    Well-Known Member

    Jan 8, 2009
    751
    5
    This should help you when driving relays.. For 6V, use 1k or 3.3k resistor instead of 10k..

    [​IMG]
     
    Last edited: Aug 8, 2009
  7. miniElectronics

    Thread Starter Member

    Aug 4, 2009
    20
    0
    Thank you all. I think you all have given enough information so it will work.

    :)
     
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