Transistors

Discussion in 'General Electronics Chat' started by Sidd, Apr 20, 2014.

  1. Sidd

    Thread Starter New Member

    Apr 20, 2014
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    0
    Hi there everybody. I was wondering if I could get some help. I'm looking to add a transistor to my project to switch a 12 volt circumstances on and off using a low voltage trigger. Could somebody help me pick the right size transistor or direct where to find out more about wiring the circuit correctly.

    Thanks
    Hobbyist
    Sidd
     
  2. ErnieM

    AAC Fanatic!

    Apr 24, 2011
    7,394
    1,606
    Hi Sidd. What's all this "circumstances" you are switching on and off?

    About how many volts is the low voltage trigger?

    And welcome to the forums!
     
  3. Sidd

    Thread Starter New Member

    Apr 20, 2014
    3
    0
    Thanks for the reply, ErnieM
    I'm looking to switch a pneumatic selonoid (12v), using an arduino(5v). I've tried some transistors (2n 4401). But I've fried a couple of them. I've seen a few videos on YouTube,but after following them step by step still no dice. I'm looking to learn a bit more about them to get the proper size, to build a circuit correctly.
    Sidd
     
  4. crutschow

    Expert

    Mar 14, 2008
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    3,244
    What current does the solenoid require to operate?
     
  5. AnalogKid

    Distinguished Member

    Aug 1, 2013
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    And, do you have a suppression diode across the relay coil?

    ak
     
  6. Sidd

    Thread Starter New Member

    Apr 20, 2014
    3
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    Hi there, the power source I've been using to power the selonoid manually has an output of 24v dc .5a
     
  7. crutschow

    Expert

    Mar 14, 2008
    13,050
    3,244
    But that doesn't tell me what the solenoid requires. What's the solenoid coil resistance?
     
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