Design 12V switch using transistor

Discussion in 'General Electronics Chat' started by athulascc, Feb 9, 2015.

  1. athulascc

    Thread Starter Member

    Aug 15, 2014
    86
    1
    hi
    I need to design score broad
    I need to switch 12V 7 segment display using micro controller
    My supply voltage also 12V
    Display takes 350mA when its all segments are lit.
    so I need to confirm my design will work or Any suggestion circuit
    attachment is my design
     
    • sb.PDF
      File size:
      101.2 KB
      Views:
      61
  2. Alec_t

    AAC Fanatic!

    Sep 17, 2013
    5,791
    1,103
    That switching arrangement looks ok.
     
  3. ScottWang

    Moderator

    Aug 23, 2012
    4,853
    767
    The common pin no need to connect to +V, because the pin was designed for the parts as relay or motor or some inductive parts.

    If the c output of Q2 need 350 mA then the base must be providing 35mA, I'm afraid your circuit can't offer the heavy current.
    I like to use the driver as below, it's quite normal.

    5VinTo12Vout_ScottWang.gif
     
Loading...