Transistor as a switch

Discussion in 'The Projects Forum' started by kiwi101, Apr 9, 2014.

  1. kiwi101

    Thread Starter Member

    Feb 18, 2014
    38
    0
    Hey guys about a month ago you helped me come up with a schematic for 16 LED's which light up with the help of a dipswitch but the schematic doesn't seem to be working.
    Forward current max.: 30mA·
    Forward voltage max.: 2.5V·
    Reverse voltage max.: 5V
    limiting resistor= [V(s) - [Vd + Vd + Vd + Vd]]/I = [12-8.8]/.02 = 160 Ohms
    wattage value is .064
     
  2. kiwi101

    Thread Starter Member

    Feb 18, 2014
    38
    0
    My Professor want us to use transistors its more for the learning experience
     
  3. ericgibbs

    AAC Fanatic!

    Jan 29, 2010
    2,504
    380
    hi,
    I would suggest that first you look at powering only one LED with a transistor and using a dip switch to control the transistor base.

    Post a circuit showing how you think this could be done.:)
     
    Last edited: Apr 9, 2014
  4. wayneh

    Expert

    Sep 9, 2010
    12,154
    3,061
    And consider NOT connecting all the switch outputs - and transistor bases - together. Separating them will allow individual control over each string of LEDs. Think about what is on the other side of that switch. What is the input?
     
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