Re: Audio Spectrum analyzer help

Mike Bates wrote: 
I want to build a cheap audo spectrum analyzer, but im not actually going to
be doing true analysis with it or anything like that.

More or less, its going to be used for looks. (like the ones in stereo
systems).

I am building a little Stereo amplifier for a school project, and I want to
build this spectrum.

I have a 12-bargraph VFD display, that is multiplexed array.

All anodes of the bargraph are common to one another, but the grids are
seperate for each bargraph.

I was thinking about using a 4017 to scan the display, wiht a shitload of
active bandpass filters and 4016 ICs to select each bandpass filter in sync
with the scan.

This would take alot of parts, but if there is a simpler way to do this, let
me know.

I seen something on switched capacitors, but I know nothing about them, or
how to multiplex them into the display.

Any thoughts? or ideas?


This should be doable. You're definitely using old technology, but hey, if it works...

You may look at the 405x multiplexers, to save you some packages.

I doubt if it's what you're thinking of, but you can get switched capacitor filters and configure them as bandpass units -- this may be the quickest, most direct way to get 12 bandpass filters.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
.

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