What ICs should I use for an audio spectrum analyser?

I want to make a spectrum analyser and i'm not sure what op-amp I should use for a filter circuit. I'm pretty sure about using an LM3916 for an LED bar to respond to the volume increase, but I would like to have an idea for what IC to use for a filter circuit. Any help? Thanks! 

AndyGadget1 year ago
THIS is the chip I was thinking of - Feed your audio straight into it and it gives you a level out representative of each of 7 frequency bands.  The only difficulty is that the O/P is multiplexed so you'd probably have to go the microcontroller route for display rather than LM3916.
Pretty well any common-or-garden Opamp, like a 741 will work, although I seem to remember that National Semiconductor did a one-chip solution for spectrum analysers.
WoW ! ! ! Sad news for me :(. .......  didn't know Ti swallowed N.S.
Poor Bob must be turning over in his grave.

How do you, handle the passing of iconic companies, in your own lifetime ?

I still have a set of their books.
Who is next..
Burr-Brown - TI
National- TI
Phillips - NXP
Siemens - Infineon

The list goes on. Its not the COMPANIES I miss but the people. We lost Bob and Jim within two weeks of each other, and of course, I lost my father about 3 weeks after that.

Has to be said, TI are VERY respectful of the legacies of the companies they aquire

Get More Out of Instructables

Already have an Account?


PDF Downloads
As a Pro member, you will gain access to download any Instructable in the PDF format. You also have the ability to customize your PDF download.

Upgrade to Pro today!