U87 ALIEXPRESS

[ilikeit]

Hello everyone
I recently purchased this microphone from AliExpress style B34
https://fr.aliexpress.com/item/1005...st_main.5.6d735e5bN2cE6h&gatewayAdapt=glo2fra


It has a low pressure but the sound is not that catastrophic...
Especially for 45€...
Here are photos of the interior and the capsule.






Do you think we can improve it for little money?
Capacitors, etc etc

I also have a very loud resonant noise, I was told to perhaps do an assembly "in the air" of the 1G resistors

But I don't really know what that means ;-)


Thanks to you

 

[pucho812]

at that money, you would be hard pressed to not gut all of it and build a real mic into it.

 

[Ó Draighnáin]

Assembly is air means that the sensitive nodes are soldered/joined off the pcb floating in the air.

 

[Barry Hufker]

The link in the OP doesn't lead to the microphone shown.

 

[MicMaven]

Assembly is air means that the sensitive nodes are soldered/joined off the pcb floating in the air.

Do we tell him about "dead bug" and "point-to-point" and "free form" soldering now, or later in the course? I believe "Manhattan" style is not taught until Soldering 102.

James

 

[k brown]

I don't see anything assembled in air in that mic.

 

[pasarski]

Do we tell him about "dead bug" and "point-to-point" and "free form" soldering now, or later in the course? I believe "Manhattan" style is not taught until Soldering 102.

James

I also learned something new, that l you. I think I'm ready for the Soldering 102. I think my next build will be wild!

To the op: I bought a similar mic, though it had an electret capsule inside. That's funny, because the circuit is meant for externally polarized capsules. It even has a DC-DC converter board (the one with fewer components).

The loud resonant noise could come from the stiff looking capsule wires or the rigid capsule holder. Building the high z part in the air would probably make the mic even more microphonic and "resonant" if not executed with caution. Or is it "whining"? Maybe it's oscillating

You're not going to make it any better swapping capacitors. It's ok circuit imo (in a broad sense of ok). Just leave it as it is and maybe try different capsules. Or build a completely different circuit for fun or for an educational project. Maybe re-use the DC-DC board if you choose that route.