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VU Meter help Answered

I'm trying to build a VU meter and am having trouble finding a schematic that actually works.  I having tried using the LM3915 and LM3916 both seem to act the same way.  I've tried 5v 9v and 12v sources along with every schematic I can find with no luck.  Either all the lights flicker a very fast.

These are the schematics I have tried:


Nothing seems to work.  I have added two 1uf caps across the source and a variety of resistor combinations but always end up with nothing or flickering lights.  What have I done wrong? 

1 Replies

steveastrouk (author)2011-08-24

Add a halfwave "perfecf rectifier" to the circuit.
Go to the master source http://www.national.com/ds/LM/LM3915.pdf and you will see a suitable application circuit.


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