Simple, quiet mic with an electret capsule.

[pmfalcman]

For the lack of this capsule that @kingkorg reccomends
https://www.aliexpress.com/item/1005006064243335.html

I bought this one (prompted by @pasarski recommendation)
https://www.aliexpress.com/item/1005006970192646.html

I paired it with OPIC circuit by @rogs .
At first I planned to buid it the way real men do - rogs' way - on stripboard. But it lost, pricewise, to Mic Sharf's pcb. 5 USD for 10 boards is hard to beat. Sorry, @rogs
Beautifully simple circuit, the build was a breeze.

The effect is spectacular - this thing is quiet. Like really quiet. The most scientific trial I could quickly run: quiet night and DR-70D turned all way up, +63dB, all I could hear was distant hum of traffic.
And leaves falling from trees...
On par with AOM 5024. Not that sensitive of course.

Sure, not as ambitious a build as a tube mic but this is what I wanted - a quiet, cardioid electret mic.
We'll see how cardioid it really is.


BTW the pcb fits the BM-800 body. I'm not a fan but well... If it works it's good

 

[GVK]

Due to budget constraints I've been considering this build for a while.
I'll probably go with some spare stripboard I've got in my stash.
How did you mount the 25mm capsule?
Cheers

 

[pmfalcman]

Due to budget constraints I've been considering this build for a while.

It's worth it even if you're filthy rich

I'll probably go with some spare stripboard I've got in my stash.

Really do consider ordering the boards from PCBWay (link on the OPIC site). They're very well made and populating them is a breeze.
5 USD for 10 boards? C'mon! What would this be? 3 quid?
Just pay attention - the default quantity is 5 pcs (same price!)And the default shipment method is pricey (UPS, DHL or smth)
I chose mail. Took two weeks to arrive. But for 3,50 - not 25 USD.

How did you mount the 25mm capsule?
Cheers

I just cut the existing capsule holder (some shitty polistyrene), left a "half-moon" and used two-sided thick rubber tape.

Will add rubber spacers between the holder and the frame to (hopefully) diminish the handling noise.

 

[pmfalcman]

 

[k brown]

Do that capsule a favor and put a BM700 head grill on it; the slanted shape is more neutral than the cylindrical.

The M 49 / U 67/87 didn't have that shape for no reason.