Test AS3340 and TL072

Do you have an oscilloscope? If not, the quickest way is to use the once working circuit you already have, and start by replacing the TL072. If things still don’t work, odds are you damaged the AS3340.

(also, see here for some ways to protect your modules – e.g. diodes from rails to ground are easy to add, and provides good protection, at least if you have a reasonably good power supply that can handle a brief short.)

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