Searching for the right component!

Discussion in 'The Projects Forum' started by brendyboy, Sep 25, 2007.

  1. brendyboy

    Thread Starter Member

    Dec 21, 2005
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    Good day to you all

    My knowledge of the range of electronics components is a little hazey!

    Im looking for a component which acts as a physical switch, or lever (something with a small moving mechanical component) so that when current passes through, it flicks one way, and when current stops passing through, it flicks another way (preferably in the opposite direction). Are relay swtiches what Im after?? If so what type?

    Would appreciate any help!

    Cheers

    Brendan
     
  2. beenthere

    Retired Moderator

    Apr 20, 2004
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    A relay is about all that comes to mind.
     
  3. niftydog

    Active Member

    Jun 13, 2007
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    ...and the type would depend on the application. You'd need to post more detail for anyone to help you further.
     
  4. thingmaker3

    Retired Moderator

    May 16, 2005
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  5. cumesoftware

    Senior Member

    Apr 27, 2007
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  6. brendyboy

    Thread Starter Member

    Dec 21, 2005
    27
    0
    Thanks for the advice guys - I'll have a read through that chapter thingmaker3 as I could do with learning more about relays.

    A friend of mine mentioned a solenoid as I described what I was trying to achieve. does this work in a similar way as a relay? After all im just after an electromechanical component which can be used as a remote switch.
     
  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Yeah, solenoid is what I first thought of.

    A relay has a solenoid inside it that moves electrical contacts.

    Basically, a solenoid is an electrical coil, with a moveable armature able to slide within the coil, that is made of a ferrous material (iron, steel, etc) It may or may not be spring-loaded to force a "known" state.

    An ordinary old-fashioned "ding-dong" type of doorbell is a common use for a spring-loaded solenoid.

    Relays are used in automotive applications quite a bit, among other places. I mention autos, because nearly everyone has access to one, or an auto parts store.
     
  8. brendyboy

    Thread Starter Member

    Dec 21, 2005
    27
    0
    fantastic! I'll start looking for one I can use

    thanks for the advice guys
     
  9. brendyboy

    Thread Starter Member

    Dec 21, 2005
    27
    0
    ..... Just one last thing

    I want to connect this solenoid to a circuit with an 18v battery. Will it be likely for me to find a solenoid no longer than 5cm which will handle this voltage??
     
  10. beenthere

    Retired Moderator

    Apr 20, 2004
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    282
    The most imortant consideration is the load you are going to switch. If it's low volts and small current, then a relay that small is possible. If it's 120 VAC @ 20 amps, you're going to need a physically larger relay.

    Perhaps you could share your application, so we can make better guesses?
     
  11. brendyboy

    Thread Starter Member

    Dec 21, 2005
    27
    0
    my circuit will consist of a 18vdc battery with a hedge trimmer motor. the idea is to have an atomatic switch (the solenoid) to act as a release pin for a small mechanism.

    I hope this clears things up. I'm also not sure of the power of the motor. I assume it's measured in wattage??

    thanks guys

    bren
     
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