Relay Switch Question

Discussion in 'Homework Help' started by dotnetforce, Feb 24, 2009.

  1. dotnetforce

    Thread Starter New Member

    Feb 24, 2009
    3
    0
    Hello All,
    I have a quick question.
    This is the requirement.
    I need to control a low voltage circuit (5 Volts), with a 120 Volt input.
    If the 120V circuit is closed, then it needs to close the 5V circuit too.
    Do I do it with the relay ?
    I have attached the picture along with to make my question clear.
    The incoming 120V, should control the 5V circuit.
    Any suggestions or ideas guys ?
    Awaiting your valued responses.
    thanks
    Shawn
     
  2. jut

    Senior Member

    Aug 25, 2007
    224
    2
    Do you mean you need to control a 120V circuit with a low voltage circuit?
     
  3. dotnetforce

    Thread Starter New Member

    Feb 24, 2009
    3
    0
    Hello Jut,
    It is the reverse.
    I need to control 5V circuit with 120V.
    If 120V is ON, then it should put on the 5V circuit.
     
  4. LesterPhil

    Member

    Feb 25, 2009
    10
    0
    aaaa..... why should you use a relay..... it makes no sense... how about using a step down transformer with a simple circuit bridge,capacitor,and 7805 regulator.....

    if you will going to plug your 120vac the bulb will light-up....

    okok....
     
  5. dotnetforce

    Thread Starter New Member

    Feb 24, 2009
    3
    0
    Hello LesterPhil,
    Thanks for the reply.
    I am not an electronics guy :(. I learnt electronics in school and that was it.
    I am working on a project at work and I have this need and need to come up with a circuit.
    I would really appreciate a ton if you can give me the circuit diagram for the above described solution.
    Also, the solution should make sure, the 120V circuit does not burn the 5V circuit ( Do we use a fuse or something like that ?).

    It needs to be a very robust circuit.
    Appreciate the help man.
     
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