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would simply heating it be an option? Use a torch or boil it in water. best of luck, Stan

Why not use a flip flop set up to toggle? This will divide the incoming frequency by two. best of luck, Stan

Hi Smythe, I don't know about the .bin format, but I know that you can download an eval version of Cool Edit Pro (edits sound files) from www.harmonycentral.com in particular: http://www.harmony-central.com/Software/Windows/audio_editing.html if you're using windows. Never used it myself...

Hi, Here's an idea. Use a low pass filter (see Maxim for a good assortment of filter types and pole numbers) to make your 1800 Hz cutoff frequency. Then use further amplification and a comparator to re-create your square wave pulses after the filter. Good luck, Stan

Mooimooi, Awesome, good luck and I hope it all works out! Stan

What you're looking for is a spectrometer. Look at a company called "Ocean Optics" for an idea of some small versions. It is basically a diffraction grating and a long array of photodiodes, arranged such that each spectrum line falls on a different photodiode. Do some multiplexing...