Please read the description first. Video about the extremely good properties of an electret microphone capsule, type number EMY-63M/P. Say: a condensor microphone.
Its frequency range goes from 20 Hertz to 20 KC, and flat (!). And it is very cheap.
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The capacitor value (not showed in the drawing) to take out the audio signal can be between 470 N (=0,47 uF) and 220 N (0,22 uF). My best idea is: don't use electrolytics. They can/will deteriorate on the longer time (5-10 Years). Non polar caps. in the order of 0.47 UF (470 N) up to 1 uF (non-polar) will do the job for at least 10-20 Years (or more...).
I ordered it (a few of them, these electret microphone capsules) via the Reichelt website, Germany. And I am going to use it in a new (more simple) circuit of a “hearing aid for elderly”. It will be supplied by 2 (two) Carbon Zinc or Alkaline batteries. With that super good Electret microphone capsule.
Everything about this Electret microphone capsule is explained in the video, so that is all for this moment.
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