it would be good to have a 10k series resistor at the input. the noise might go up a bit, and if thats not acceptable, i can find another opamp that would be better.Ģ. you might want to try swapping your 082 in there and see how it sounds. it also consumes a fair bit of juice, so not the best for battery operation. this will degrade your input signal, requiring more gain, negating some of that low noise at the input. the NE5532 is a decent low noise opamp, but it has low input impedance. But there's at least one on the accordion body to allow for percussive hitting, tapping etc.įirst off, a few more questions: how does it sound to you currently? noise level ok? tone ok?ġ. Mostly placed the piezos on the reed blocks themselves as I found this insulated them somewhat from the clatter of the valve levers (can be quite overwhelming ). Here's a pic of the internal piezo setup (with some other fun too). But I'd like to capture percussive hits too (hence using piezos) so the actual capture range maybe 45 to 8000hz? Open to advice on such matters. Then for frequency, the fundamentals of the accordion I'm using range from 65 to 2000hz. Placement of the ICs is in the schematics. Not sure if that defeats the object to have good opamps either side of a bog standard. Then to split the signal so I have two simultaneous outputs I've got a TL084 in the middle acting as a buffered multiple. Hey, so I'm using NE5532s for the first and last sections of the audio path (where I figured the signal needed gain). What opamps are you using? what frequency response do you want?
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