solenoid

Discussion in 'The Projects Forum' started by Wild Amberi, Aug 3, 2015.

  1. Wild Amberi

    Thread Starter New Member

    Jul 18, 2015
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    hi my project is like this .I want to to implement it in a circuit.I am a noob


    Untitled.png
     
  2. ISB123

    Well-Known Member

    May 21, 2014
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    I'm confused:confused:.
    Please be more elaborate.
     
  3. Wild Amberi

    Thread Starter New Member

    Jul 18, 2015
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    I have a solenoid which must be triggered by the voltage of the led.12v is the source and the voltage to activate the solenoid
     
  4. ISB123

    Well-Known Member

    May 21, 2014
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    What are the specs of solenoid?
     
  5. Wild Amberi

    Thread Starter New Member

    Jul 18, 2015
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    input=12v
    current 1A
     
  6. #12

    Expert

    Nov 30, 2010
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    No problem. Just use a magic switch.
     
  7. ISB123

    Well-Known Member

    May 21, 2014
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    Last edited: Aug 3, 2015
  8. Wild Amberi

    Thread Starter New Member

    Jul 18, 2015
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    sorry friend for the lack of details.The 3v is a led positive voltage for another device.when the device reaches a certain temperature a led is on which I want to use as a trigger for the powering of the solenoid valve .The 12 v source is already ground so as the output to the solenoid is also grounded
     
  9. ISB123

    Well-Known Member

    May 21, 2014
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    Diodes drop voltage so you don't really have 3V at the LED you got like 1V. Since typical red LED has Vf of 2V.
    3V-2V=1V
    Or you took the multimeter and confirmed that you got 3V after the LED?
     
  10. #12

    Expert

    Nov 30, 2010
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    Consider this.
    Anywhere near correct?
     
  11. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    #12, are you trying to blow up the gate of the NFET?
     
  12. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    I think the OP needs a high-side switch if one leg of the solenoid is grounded and he want LED lit = solenoid energised?
     
  13. #12

    Expert

    Nov 30, 2010
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    Wrong symbol? I thought I put a p-fet in there. :confused:

    Arrgh! AFU. The solenoid is on the wrong side of the mosfet.:eek:
     
  14. #12

    Expert

    Nov 30, 2010
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    Better now?
     
    ebeowulf17 likes this.
  15. MikeML

    AAC Fanatic!

    Oct 2, 2009
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    Yes, but Wild has to validate that he can, in fact, tie the negative end of the 12V supply to the LED cathode.
     
  16. Reloadron

    Active Member

    Jan 15, 2015
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    Get a DC SCR to act as a switch which uses a low (3 volt) control voltage and can drive a 1 amp inductive load at 12 volts to handle your solenoid. That is the simplest turn key one component solution I can think of. DC SCR should get some Google hits for you. The SCR goes in parallel with your LED assuming you have a On/Off 3 volt signal to work with. That or remove the LED and replace with the SCR and place another LED across the relay coil.

    Ron
     
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