Push-pull component

Discussion in 'General Electronics Chat' started by Imdsm, Aug 22, 2011.

  1. Imdsm

    Thread Starter Member

    Feb 11, 2011
    39
    0
    Hi there,

    I am looking for some sort of push-pull component, where I can for example have three wires, 5v, 0v, and then a wire that if I send 5v down, it will push a cylinder fully, 2.5v - it will push a cylinder half way, and 0v it will have it retracted.

    If you can imagine a car engine, this would be like the piston. I want to use it for making a kind of digger arm. I can think of a design using a servo but that wouldn't really be the traditional "hydraulic" way that an arm moves.

    [​IMG]

    Do any of you know of a component like this? I have searched for solenoid components on ebay, maplin, all over the show, but to no luck.

    Also, if I do use a servo, how strong are they?


    Cheers,
    Adam
     
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
    Search "proportional control" and "linear actuator".
     
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  3. Imdsm

    Thread Starter Member

    Feb 11, 2011
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    Perfect, exactly what I was looking for. They are pricey to buy but now I can see how they work, they seem pretty simple! Thanks a lot!
     
  4. Jaguarjoe

    Active Member

    Apr 7, 2010
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    Imdsm likes this.
  5. Imdsm

    Thread Starter Member

    Feb 11, 2011
    39
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  6. KJ6EAD

    Senior Member

    Apr 30, 2011
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  7. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    Well, the motor that Jaguarjoe linked to has a 50-slot photo tachometer on it; maybe you can just count the pulses from the tach to determine the extent once you'd retracted it to establish a zero point by hitting a switch or similar.
     
  8. strantor

    AAC Fanatic!

    Oct 3, 2010
    4,302
    1,988
    If you want it to behave like a pneumatic piston, then use a pneumatic piston with a proportional air valve.

    By the way your pic looks exactly like a guy I used to work with. I actually thought you were him until I saw your location.
     
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