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Author Topic: AT822 insides  (Read 3205 times)

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Offline poorlyconditioned

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AT822 insides
« on: June 06, 2006, 07:43:49 PM »
Anyone wonder what is inside the AT822?

It has two nice (!) electret elements and a simple "emitter follower" circuit that runs off a low voltage (1.5V) AA cell.

I've ripped the head off and I'm just going to keep that.  Power with either Minidisc plug in power, or battery box, or both.  This is still a work in progress.

Anyway, here is a rather poor picture of the elements:

They are approx. 15-20mm across with large vents in the back.  Note the holes only around the outside, like the Nak capsules.  But unlike the Naks, these have a gold plated diaphragm.

  Richard
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Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
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Offline Church-Audio

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Re: AT822 insides
« Reply #1 on: June 06, 2006, 09:03:40 PM »
looks like a primo em63 capsule can you take a shot of the back of the capsule?


Quote from: poorlyconditioned on June 06, 2006, 07:43:49 PM
Anyone wonder what is inside the AT822?

It has two nice (!) electret elements and a simple "emitter follower" circuit that runs off a low voltage (1.5V) AA cell.

I've ripped the head off and I'm just going to keep that.  Power with either Minidisc plug in power, or battery box, or both.  This is still a work in progress.

Anyway, here is a rather poor picture of the elements:

They are approx. 15-20mm across with large vents in the back.  Note the holes only around the outside, like the Nak capsules.  But unlike the Naks, these have a gold plated diaphragm.

  Richard

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EMAIL Sales@church-audio.com

Offline poorlyconditioned

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Re: AT822 insides
« Reply #2 on: June 06, 2006, 09:06:49 PM »
I've never heard of EM63.  Do you mean EM68?  That one looks similar, but not the same.  But I don't think Primo are gold capsules, are they?

By the way, rumour has it that these are the same capsules as in the AT4033, but I don't think they look the same.  (There are drawings of the 4033 insides on the AT website, and they show holes in the middle as well as the edges of the front of the capsule.  Also, the capsule does not have a hump on the back like these do.)

I'll take some more pics later...

  Richard
« Last Edit: June 06, 2006, 09:08:30 PM by poorlyconditioned »
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Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **

Offline poorlyconditioned

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Re: AT822 insides
« Reply #3 on: June 06, 2006, 09:40:23 PM »
More pics.  (Sorry, a bit fuzzy).

Rear of capsules:


Front of capsules:


The elements have no part #'s or anything, but I do see "AT" silkscreened on the back.

  Richard
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Mics: Sennheiser MKE2002 (dummy head), Studio Projects C4, AT825 (unmodded), AT822 franken mic (x2), AT853(hc,c,sc,o), Senn. MKE2, Senn MKE40, Shure MX183/5, CA Cards, homebrew Panasonic and Transsound capsules.
Pre/ADC: Presonus Firepod & Firebox, DMIC20(x2), UA5(poorly-modded, AD8620+AD8512opamps), VX440
Recorders: Edirol R4, R09, IBM X24 laptop, NJB3(x2), HiMD(x2), MD(1).
** This individual has moved to user "illconditioned" **

Offline Nick's Picks

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Re: AT822 insides
« Reply #4 on: June 07, 2006, 07:31:47 AM »
i like the sound of this project!
the hacked up 822 stealth job.  that would mount in a baseball hat real nice.

why cant' professional companies make a coincident stereo mic w/the elements alligned properly?
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