I built this circuit, with the m7 type capsule everything works correctly, with the k47 type capsules there is a problem (I checked several different capsules from different manufacturers).
with the k47 capsules the signal is very quiet and kind of noisy but (note - this is strange) when I connect backplate to front on PCB and front od capsule to backplate on PCB microphone works fine.
I checked the transformer, all connections, gnd.
It is strange that in the same system the m7 capsule with polarization on the backplate works correctly and the k47 capsule works correctly when the polarization is on the membrane.
does anyone have any ideas?
thank you
with the k47 capsules the signal is very quiet and kind of noisy but (note - this is strange) when I connect backplate to front on PCB and front od capsule to backplate on PCB microphone works fine.
I checked the transformer, all connections, gnd.
It is strange that in the same system the m7 capsule with polarization on the backplate works correctly and the k47 capsule works correctly when the polarization is on the membrane.
does anyone have any ideas?
thank you
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