Neumann U47FET Clone: D-U47 FET Microphone Project PCB Build thread

[burn4ever]

Well, it´s me again 
Are there any documentations how to calibrate the Trimmer Resistors and how to connect (solder) the capsule?

 

[poctop]

Well, it´s me again 
Are there any documentations how to calibrate the Trimmer Resistors and how to connect (solder) the capsule?

the Pot was only for testing purposes so if you installed it anywhay , you don't have to adjust anything ,
you can also decide to not installed it and follow this procedure.
as far as the capsule goes , check on the first page  tutorial , the front diaphgrame connect ( floating to the 1G resistor )
and the backpate of the capsule goes to a jumper-pad labeled BCK only one of the pad goes to gnd.

Best,
Dan,

 

[acdc-angus]

Sorry, but the BOM seem don't be correct. That's normal?
I found caps/resistors who shouldn't be here, because there aren't on the schematic?

I don't found those caps and others in the BOM...

 

[poctop]

Sorry, but the BOM seem don't be correct. That's normal?
I found caps/resistors who shouldn't be here, because there aren't on the schematic?

I don't found those caps and others in the BOM...

Those capacitors are in the BoM but they are not electrolytics as in this pictures as they were not available at this time ,
they are actually Tantalum Capacitors,  note that tantalum capacitors are polarized.

here is an excert from the current BOM,
https://ca.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=4bdecadc37

also if you hit the refresh key while viewing  the BOM form mouser , you will be able to see all the notes in the customer part number column it tells alternative part number as well as part that are optional if you some others are available,



Mouser #:  80-T356E475K035AT 
Mfr. #:  T356E475K035AT 
Manufacturer:  Kemet 
Desc.:  Tantalum Capacitors - Solid Leaded 4.70uF 35.0V10% 
RoHS:  RoHS Compliant 
Availability
1  Ships Now
$1.78  $1.78

Mouser #:  80-T356A334K050AT 
Mfr. #:  T356A334K050AT 
Manufacturer:  Kemet 
Desc.:  Tantalum Capacitors - Solid Leaded 50volts 0.33uF 10% 
RoHS:  RoHS Compliant 
Availability
1  Ships Now
$1.29  $1.29

Mouser #:  80-T356B105K050AT 
Mfr. #:  T356B105K050AT 
Manufacturer:  Kemet 
Desc.:  Tantalum Capacitors - Solid Leaded 1.00uF 50volt 10% 
RoHS:  RoHS Compliant 
Availability
2  Ships Now
$1.46  $

Best,
Dan,

 

[acdc-angus]

Ok, thanks Dan !

In the BOM, There are a 1000pf - 400v (505-MKP21000/400/5). It's a replacement caps instead of 2200pf at C1?

 

[poctop]

Ok, thanks Dan !

In the BOM, There are a 1000pf - 400v (505-MKP21000/400/5). It's a replacement caps instead of 2200pf at C1?

yes it is an option , original value is 2200pf,  note says option gate coupling cap,
I think I will remove this to avoid confusion in a later time ,  Thanks
Best,
Dan,

 

[acdc-angus]

Ok, thanks Dan !

In the BOM, There are a 1000pf - 400v (505-MKP21000/400/5). It's a replacement caps instead of 2200pf at C1?

yes it is an option , original value is 2200pf,  note says option gate coupling cap,
I think I will remove this to avoid confusion in a later time ,  Thanks
Best,
Dan,

Thanks again, and a last question.

I don't want to buy styroflex, 'cause I don't found in Europe (I'm French) and buy them in USA, it's too much.

So, if I remplace them by Mica 18pf - 500v and Mica 33pf - 500v? Like that :

18pF :
http://www.mouser.fr/ProductDetail/Cornell-Dubilier/CD15CD180JO3F/?qs=sGAEpiMZZMtLiKaZgV7flaroxyCpcgny9mqIOjWCBkQ%3d

33pF :
http://www.mouser.fr/Search/ProductDetail.aspx?R=CD15ED330GO3Fvirtualkey59850000virtualkey598-CD15ED330GO3F

Thanks

 

[poctop]

Ok, thanks Dan !

In the BOM, There are a 1000pf - 400v (505-MKP21000/400/5). It's a replacement caps instead of 2200pf at C1?

yes it is an option , original value is 2200pf,  note says option gate coupling cap,
I think I will remove this to avoid confusion in a later time ,  Thanks
Best,
Dan,

Thanks again, and a last question.

I don't want to buy styroflex, 'cause I don't found in Europe (I'm French) and buy them in USA, it's too much.

So, if I remplace them by Mica 18pf - 500v and Mica 33pf - 500v? Like that :

18pF :
http://www.mouser.fr/ProductDetail/Cornell-Dubilier/CD15CD180JO3F/?qs=sGAEpiMZZMtLiKaZgV7flaroxyCpcgny9mqIOjWCBkQ%3d

33pF :
http://www.mouser.fr/Search/ProductDetail.aspx?R=CD15ED330GO3Fvirtualkey59850000virtualkey598-CD15ED330GO3F

Thanks

there is no problem on doing that too, that is the beauty of DIY sometimes you have to take what you have in hand to make it work,
Best,
dan,

 

[mappyo]

Just want to chime in here to say I've been really enjoying using this mic. I had a great time building it and am thrilled that it works and sounds good. I decided to use the Thriersch red line capsule and a Cinemag CM-13101 transformer.

I've found this combination to have a full low end with a bit of high mid presence. It has kind of a mellow top end in a nice way. It's definitely very usable on many instruments. It sounds full and rich. The mic's rejection comes in quite handy when micing a bass drum or bass amp too.

Here's a link to a soundcloud playlist with some samples:
https://soundcloud.com/mappyo/sets/dfet47-samples

Hope this is of interest. I'm looking forward to making more mics.

 

[kante1603]

Thanks for sharing!
On "Far far away",is it the D-U47 on the vocal?If so,what was the chain?


Best,


Udo.

 

[mappyo]

Hey Udo,
It was the D-47FET on the vocal. The chain was a classic api VP28 into a leviathan opto compressor, taking off at most 3 dB's. Then into lynx converters straight to protools. There wasn't any EQ. For "Far Far Away" I did put a limiter on the 2-bus, but it is hardly doing any gain reduction at all, maybe a decibel here and there. There isn't any limiting on the bass and bass drum tracks though.

Best

Thanks for sharing!
On "Far far away",is it the D-U47 on the vocal?If so,what was the chain?


Best,


Udo.

 

[kante1603]

Sounds really great,congrats!VP28.....that gives some additional "magic" to the vocal,I have 8 of them.
Great Mic & PreAmp-Combo I must say!I use them nearly daily with U87s.....
Very nice indeed,


best,


Udo.

 

[mappyo]

Thanks!

Sounds really great,congrats!VP28.....that gives some additional "magic" to the vocal,I have 8 of them.
Great Mic & PreAmp-Combo I must say!I use them nearly daily with U87s.....
Very nice indeed,


best,


Udo.

 

[gevermil]

This build with a Beesneez K7 is very nice .
It was impressive in a shoot out with a few expensive mics .
I used a cinemag transformer and a old equinox U47 body .

 

[acdc-angus]

Hi everyone !

Sorry, but I search and search for this part... And I don't found it on Mouser... An idea?

 

[poctop]

Hi everyone !

Sorry, but I search and search for this part... And I don't found it on Mouser... An idea?

send a PM to Mappyo i might be able to help on this find as this one is its build ,
Best,
Dan,
or you could practice on mousering it ,  i bet you can find it ,
once you get use to mouser you can find about anything ( they have)
if you need a clue check here ,
http://ca.mouser.com/Connectors/Terminal-Blocks/Fixed-Terminal-Blocks/_/N-7rqd7/?

 

[acdc-angus]

Freeeeeeeeeeeeedoooom ! Thanks ahah ;D

Finally ! http://www.mouser.fr/ProductDetail/Phoenix-Contact/1725672/?qs=sGAEpiMZZMvZTcaMAxB2AF3qQv3QF5c1cqzdDV%2fmZgo%3d (they show 10P in pic, but it's a 4P) great ! 

It's the good pitch? 2,54mm?

 

[poctop]

Freeeeeeeeeeeeedoooom ! Thanks ahah ;D

Finally ! http://www.mouser.fr/ProductDetail/Phoenix-Contact/1725672/?qs=sGAEpiMZZMvZTcaMAxB2AF3qQv3QF5c1cqzdDV%2fmZgo%3d (they show 10P in pic, but it's a 4P) great ! 

It's the good pitch? 2,54mm?

Do not remember by heart but user a ruler and check the pcb up,
i dont have acces to one right now,
dont worry about the pictures refer to the details and spec always,
D

 

[mappyo]

That's the exact part I used--2.54 pitch too.

Freeeeeeeeeeeeedoooom ! Thanks ahah ;D

Finally ! http://www.mouser.fr/ProductDetail/Phoenix-Contact/1725672/?qs=sGAEpiMZZMvZTcaMAxB2AF3qQv3QF5c1cqzdDV%2fmZgo%3d (they show 10P in pic, but it's a 4P) great ! 

It's the good pitch? 2,54mm?

 

[mgronroos]

Two happy FETs waiting for a stereo recording.. 

Cheers!
//Michael