Then, of course.....should you wish to take your newly-designed circuit beyond being just a breadboard prototype circuit and you would like to have it become a "real thing" that you can put inside some manner of a microphone housing.....you will also need to learn how to properly design and layout a PCB as well. And.....closely following the learning of that specific skill, you will also need to already have and/or learn at least a modicum of mechanical design expertise so you will be able to build your microphone and put it all together. YAY!!!
BUT, WAIT!!! -- THERE'S MORE!!! ---- Even if you only stay at the breadboarding design-level of your new endeavor, you will also need to learn and/or pickup on how to specify, source and purchase all of your electronic components for your new designs. As an example, like you I am here in the U.S., but for a little project that I am currently working on, some of the capacitor values and types that I need for a circuit were only readily available from a distributor that is located in Greece!!! They will be here around mid-March.
So.....just prepare yourself for a "long road ahead" of continual learning while enjoying the satisfaction of your circuits as you power them up!!! Are we having fun yet???
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Okay. Have to ask (and am aware that component availability issues are ongoing) what special type/ values of capacitors are you best sourcing from Greece ?