LM3915 doubt

Thread Starter

acemax

Joined Feb 16, 2013
1
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
 

tubeguy

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