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Unknown AKG capsule (diy mic help)
Unknown AKG capsule (diy mic help)
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Old 3rd January 2018, 03:42 PM   #1
hajko is offline hajko  Serbia
diyAudio Member
Join Date: Mar 2014
Default Unknown AKG capsule (diy mic help)

Hi, guys.

I found this capsule on line, but there's no info at all. It's akg ck40. It's 15mm x 6mm in diameter.

I already built a mic based on schoeps circuit (Zapnspark version) and i used J305 fet...it works ok, except a huge high frequencies boost. I will post images of disassembled capsule.
I tried to lower high frequencies by soldering 6.2nf or so...in parallel with drain resistor. It helped, but it needs more taming.

My question is...do i need to build a circuit with polarization voltage for the capsule...Would that help...and is this electret or condenser type?

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Old 5th January 2018, 06:47 PM   #2
dotneck335 is offline dotneck335  United States
diyAudio Member
Join Date: Dec 2012
According to AKG data sheet, "CK" prefix indicates "Microphone capsule with condenser transducer"
therefore it must be polarized.
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