110V Capsule Polarization Voltage
« on: July 31, 2019, 01:28:46 PM »
I just wanted to report that i have been using this edge terminated capsule from 797 audio for about two years with about 110v (possibly 120v) polarizing voltage with no issues!!!

I did this unintentionally while modding a Behringer B2 to true cardioid and picked up polarizing voltage at wrong point - 110v point! Yesterday i was checking polarizing voltages on couple of my mics, so i checked this one and was floored when i found out.

The frequency response is exactly the same as at 60V, i just tested it brutally with aggressive plosives, and membrane just wont stick!

Ive never used this mic on high SPL so i wouldn't know if it clips the FET.

Another great thing about this capsule is that it doesnt react to humidity coming from breath. I am pretty sure you could drip water onto it, and it would still work.

« Last Edit: July 31, 2019, 01:31:47 PM by kingkorg »


Re: 110V Capsule Polarization Voltage
« Reply #1 on: July 31, 2019, 04:48:00 PM »
I applied 60V to my first edge terminated 'Chinese'  capsule and it collapsed a couple of hours later  --reduced the voltage to 50V  and have had no further problems...Slight drop in sensitivity of course.
It was only a 3 micron membrane according to the spec -- so that may have been a factor?

I wonder whether it's tension - or membrane thickness - that is the dominant factor with the polarisation limits on these capsules?..

I've certainly discovered a wide range of sensitivities  between different capsule types with  my RF bias experiments --  and they don't seem to correspond very accurately with the published specs!  (Much lower voltages involved with an AC bias of course)...

There seems to be an element of 'suck it and see' with these various Chinese capsules, when it comes to comparing  their specs with their real world performance....
www.amx.jp137.com - A DIY RF condenser mic project

Re: 110V Capsule Polarization Voltage
« Reply #2 on: July 31, 2019, 05:22:53 PM »
I guess you were using the kind that Microphone Parts sells. This one is pretty different. I just made a video disassembling it.



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