Transistor Switch Question

Discussion in 'General Electronics Chat' started by tonberryx, Oct 26, 2005.

  1. tonberryx

    Thread Starter New Member

    Oct 26, 2005
    I am currently working on my senior project and am having a bit of trouble. Basically, I have a 10 Volt source that needs to be given to a piece of hardware whenever a 3.6 Volt source is activated. I am pretty sure I need to deal with transistors, but don't have much experience with them. Can anyone point me in the right direction, or draw a simple diagram showing how this might work?
    Help is appreciated.

    (switch lets +10V go through to output) <----- +3V
    +10V (after switch turns on)
  2. Sebi

    Well-Known Member

    Sep 24, 2005
    The values depending from desired current.
  3. thingmaker3

    Retired Moderator

    May 16, 2005
    Relay. Less soldering. :D
  4. viterbi

    New Member

    Oct 13, 2005
    You could also use complementary enhancement-type MOSFETs instead of BJTs. Using MOSFETs would require only two resistors to bias the gates of the MOSFETs to the off state.


    10V_in --> source_of-pFET
    drain_of-pFET --> 10v_out
    drain_nFET ---> gate_of-pFET
    10V_in ---> 100k_resistor ---> gate_of-pFET
    (Vgs-threshold of pFET needs to be less than -1V but more than -7V)

    ground--> source_of-nFET
    3.6V_in ---> gate_of-nFET
    ground ---> 100k_resistor ---> gate_of-nFET
    (Vgs-threshold of nFET needs to be more than 1V but less than 3V)