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AKG genuine CK12 Brass capsule: building DIY mic with a single Jfet-transistor

I have got discovered vintage AKG CK12 Brass capsule at home.

I would like to build a mic with this capsule and use a standard one-transistor Jfet circuit of ECM electret mics (common source either
source follower)...

Has anyone ever tried to wire such a large capsule with a single Jfet transistor ? Do you think this might work as a decent condenser mic ?

Thank you for the comments!

How to choose a DIY microphone from (MicParts)

I've been ask a few times lately about what model would be the best to order from MicParts. So in this video I test 3 mics, the T47, T12 and S87

At 2 min, I made a mistake and mention the U87 but it's in fact the U47 ;)

Let me know what you think !

DIY ms76

Hello I have bought a kit from pcb grinder the ms76 kit.
Have to say was a damn blast building it, will be my first big build over my diyre stuff which is excellently described of the build process.

so my question..

Can anyone point me to material or information on determining the:
Power transformer needed I think is seen 15v output
What size iec conntectors I just see multiple sizes,

Has anyone built this kit?

I just need some help.

if anyone is knowledgeable I would greatly appreciate it

LDC Mic Shootout - ISA, T47, T12, C1 Mod, KSM32, KSM44

Hi guys,

Here is a new mic shoutout that includes 3 products from
I had many questions about the mods and the DIY Kits.
Hope you can hear the subtle differences.

I'm still getting used to audio and video productions so your comments are needed and welcome.

Btw, I'm not a signer you might have guessed ;)

Cost to build DIY acoustical door?

I'm trying to estimate two cost points for an acoustical door:

- The entire assembly including mounting hardware, seals etc.

- The door panel itself, excluding hardware, handle, etc.

I have a way to go before arriving at an estimate for the entire door, but come up with this baseline cost based on Rod Gervais's book:

1-3/4" solid wood door: $80
1/8" (8psf) sheet lead: $430
3/4" plywoood: $50

So $560 plus taxes and fasteners etc, let's round it up to $700.

Does this seem like it's in the right ballpark?


CAPI VP-28 DIY preamp review - clips included

I first learned about CAPI gear on the forums. I was looking to dip my toes into the world of API sounds, not fully knowing what that meant. I had heard all the descriptors like punchy, forward mids, aggressive, tight, etc., but wanted to try it out for myself. So many great albums were done on API's, right? I lacked that flavor in my stable, so I clicked the order button on Jeff's website and ordered the VP28 mic preamplifier. It's a two-stage preamp with a lot on board and packed in a 500 series module.



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