LM3915 Based Spectrum Analyzer

While preliminary, I have schematics mostly drawn up for a LM3915 based spectrum analyzer using Fliege bandpass filters to give me bands at 60Hz, 150Hz, 400Hz, 1kHz, 2.5kHz, 6kHz, and 15kHz. At this point, digikey seems to have run out of LM3915′s, so in about a week when they recieve some in stock I’ll put my order through (I can’t stand their extra $8 handling fee ontop of a second shipping charge for 7 backordered ICs).






I’ll also have schematics finished soon, however last night I threw together a quick opamp + LM3915 circuit just as proof of concept, nothing all too important, but its a start. The song is “Oh What A Night” by Frankie Valli & The 4 Seasons played off of a youtube clip, fed into the circuit.



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