Add Bluetooth Activated Switch (transistor) to Circuit

Discussion in 'The Projects Forum' started by rcullens, Feb 16, 2016.

  1. rcullens

    Thread Starter Member

    Apr 26, 2008
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    1
    Hi all I was wondering if it would be possible to us one of those bluetooth key locaters like tzumi tag it or magic finder to activate a transiistor to be used as a switch to turn this circuit on and off? If so what type of transistor would i need? The BT devices both have audio outputs as well as leds that flash that i could tie into to turn on the transistor therefore closing tthe circuit below correct?



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  2. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    Last edited: Feb 16, 2016
  3. rcullens

    Thread Starter Member

    Apr 26, 2008
    15
    1
    But how would I incorporate it in the circuit?
     
  4. Dodgydave

    AAC Fanatic!

    Jun 22, 2012
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    The same way, you feed a positive voltage to the gate, and the drain pulls down to the source, its the same principle.

    If you have an audio output you will need to rectify it to a dc voltage.
     
  5. rcullens

    Thread Starter Member

    Apr 26, 2008
    15
    1
    I think the place to tap would be the flashing led that only flashes when you trigger it to from the phone, i want the on off effect to toggle if you get what i mean?
     
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