LD microphonechanging capsule changes gain ? possible ??

[andre tchmil]

I have some BPM china large diagram mics here with some unknown brad of capsules.
I replaced the capsules with some other LD capsules and noticed a drop in output gain while testing.
The new capsules are slichtly smaller in diameter.
I have a gain drop of approx 4 dB.
Could the different capsule be the reason ?

 

[Gus]

It depends on the circuit used if the microphone uses a charge amp it makes sense.

Best thing would be to post a few pictures of the capsules and circuit boards.

 

[andre tchmil]

I wish I could post som pics.......

Of all the DIY LD microphones I saw, no one mentioned the fact of using different components for all the different types of capsules out there.
So I guess swapping the capsules won't damage the circuit that much.?

 

[Svart]

not sure but I would say no. if it's a mass produced capsule and a mass produced mic, those types are so cookie-cutter design that it's usually the same circuit with a few things moved around. likely that the capsule is AC coupled through a cap and has a polarizing/biasing resistor somewhere around 500M-2g ohm.. I wouldn't worry. probably just a slight mismatch of values and/or the biasing V needs changing...? maybe the diaphragm itself is loose? Just ideas to think about.

other than that, pics would be nice, or a schematic of what you have so we can really take a look at it.

:thumb:

 

[Jazzy_Pidjay]

I have test the peluso's cek367, cek12 and the TLM103 capsule
in my G7, without any other modification

and the TLM103 capsule provides approximatively 6dB more gain !!

so i think the capsule can be the reason.

 

[tony dB]

TLM103 capsule provides approximatively 6dB more gain !!

Finally some use for TLM103's, as boosters!

:green:

Tony

 

[Jazzy_Pidjay]

:grin:

finally the capsule of the TLM103 sounds good in the G7
more natural than the CEK-12 and more phat than the CEK-367.

the CEK-12 have more character, but is more aggressiv.
the CEK-367 have a more clear sound, but thinner.