sound level indicator project design

[VIYA]

how to design a sound level indicator using LM3915?

 

[KJ6EAD]

LM3916 is more appropriate for audio since it's resistor ladder has semilogarithmic steps like a Vu meter. You can Google "LM3916 vu meter schematics". Here's a good link: https://www.transkommunikation.ch/dateien/schaltungen/diverse_schaltungen/miscellaneous_circuits/Using%20the%20LM3914-6%20LED%20Bargraph%20Drivers.pdf. A search on this board will yield many references as well.