What are these value? D87 build.

[Greenie]

Hi, what are the values on the L1/L2 on the D87 board? Circled in red.

 

[Khron]

22-47uH should be fine, i'd reckon.

 

[Greenie]

Hi and thanks. I see on one build there ar two marked 473, looks like caps, and on another two resistors? What values would the resistors bea an if there are 473 caps, what voltage I wonder?

 

[Khron]

Phantom power is usually 48v, so 63v caps should be plenty.

Are the schematics and/or BOM not available on the build thread?

 

[Ricardus]

47 uH

https://www.mouser.com/ProductDetail/542-78F470-RC

 

[Greenie]

Ok, thanks, I learn something new every day...

 

[Ricardus]

Forgive the impertinence of this question, but you know Dany has a BOM for this, yes?

And any substitutions you need were mentioned in this thread:

https://groupdiy.com/threads/looking-for-component-alternatives.80225/

 

[Greenie]

It's not impertinenet at all, but this perticular mic has a minimalistic layout guide, as far as I can see. Being a typically layout builder, I need a bit more detailed one, like the U67 or the Matador c12?

 

[Khron]

https://groupdiy.com/threads/neumann-vintage-u87-clone-build-thread.48030/
"
Mouser Cart including all options ( 60M and 68M included also 2 different PN for 2K2 resistance)
important note :The BOM already contained alternate part number for the 2.2K (delete whatever is not available at the moment and also there is both the 60M and the 68M listed in there for you to decide both will work fine
just delete from your order the one you wont take, the 68M is less expensive !

Most Recent BOM here :
http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=1AD602D54E
"

Coincidence or not, the last item in the BOM linked there is, surprise-surprise, a pair of Bourns 78F470J-RC, which just happen to be...
https://www.mouser.fi/ProductDetail/542-78F470-RC