Cheap mic mods, part 1 - zener filter

[@ИльяГаврилов-м9ь]

The PCB has a transistor Q2 that is not in schematic diagram. First I thought is's a JFET, but it is marked 2L like other PNPs meaning it's either FMMT4403 or more likely MMBT5401. What is its role?

[@Not-Only-Reaper-Tutorials]

Disconnect all the capsule wires to test f really the capacitors are the ones generating the "body noise" ... sometimes random static charges can polarize the capsule enough to work under big stresses like the bmps ... so just to be sure remove both ... just a suggestion 'cause it occurred to me and I wanted to share it with you.

[@RJTC]

It's a two wire electret capsule with the only signal connection removed, in the video - the black lead is ground, which cannot inject any audio. I've modded several of these mics & the multilayer ceramics are always microphonic. This is one of the first I did, keeping the original PCB but replacing the multilayer ceramics with plastic film caps (and fitting a Shure capsule) - it was a drastic improvement, totally different to the original. kzbin.info/www/bejne/pGGqc5uim6ipb6c