LM3915 doubt

Discussion in 'The Projects Forum' started by acemax, Mar 2, 2013.

  1. acemax

    Thread Starter New Member

    Feb 16, 2013
    1
    0
    Hi,

    I am build a VU meter using the LM3915.
    My base circuit is this: http://electronics-lab.com/projects/motor_light/002/index.html

    Now I'm trying to add the circuit "Full-Scale Changes Display from Dot to Bar" on Figure 18 of datasheet.

    When LED 10 light up, all others LEDs should light up too.
    In my circuit it doesn't work.
    I'm using the BC558 PNP transistor and LM4148 fast diode. 9V supply.

    Any idea why it's not working?

    Thanks in advance.

    acemax
     
  2. tubeguy

    Well-Known Member

    Nov 3, 2012
    1,157
    197
    Double check the pinout of the transistor. Post a photo or diagram of the actual wiring if you can
     
Loading...