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

Help Support GroupDIY:

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
D-U47FET Build Thread

Let's get those Electron flowing.
All of the info: http://www.groupdiy.com/index.php?topic=49675.0

DU-47FET PCB set
58d1402a02a52.jpg


58d1402a02a7c.jpg

Fits also Alctron Gt-2b style.

58d1402a02a88.jpg



Not inclued in the Mouser Bom are:
  • 18pf Styroflex/630V
  • 33pf styroflex/630V


The trimmer in this microphone PCB is no longer necessary , make sure you jump the potentiometer pad contact and use for R6 = 6.8K instead of 3.6K,  the trimmer has been removed from the BOM As well to avoid confusion.


58d1402a02a99.jpg





BOM: http://www.mouser.com/ProjectManager/ProjectDetail.aspx?AccessID=4bdecadc37

D-U47FET Build Folder:  https://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a02aab.zip

Schemo Complete: https://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a02abc.pdf

Schemo PCB A: https://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a02acd.pdf
Schemo PCB B: https://cdn.groupbuilder.com/groupdiy/u/39511/58d1402a02ade.pdf


Microphone Body and accessories Available Here :http://www.groupdiy.com/index.php?topic=50015.0



This is how it Happened  ;D
D.




58d1402a02af0.jpg


58d1402a02afd.jpg


58d1402a02b0e.jpg


58d1402a02b1e.jpg


58d1402a02b2f.jpg


58d1402a02b42.jpg


58d1402a02b53.jpg


58d1402a02b64.jpg


58d1402a02b75.jpg


58d1402a02b86.jpg


58d1402a02b97.jpg


58d1402a02ba7.jpg


58d1402a02bb8.jpg


58d1402a02bc9.jpg


58d1402a02bd9.jpg


58d1402a02bea.jpg


58d1402a02bff.jpg


58d1402a02c10.jpg


58d1402a02c21.jpg


58d1402a02c2d.jpg


58d1402a02c3e.jpg


58d1402a02c50.jpg


58d1402a02c7a.jpg


58d1402a02c8d.jpg


58d1402a02c9e.jpg


58d1402a02cae.jpg


58d1402a02cc0.jpg


58d1402a02cd5.jpg


58d1402a02ce5.jpg


58d1402a02cf9.jpg


58d1402a02d05.jpg


58d1402a02d16.jpg


58d1402a02d27.jpg


58d1402a02d38.jpg


58d1402a02d4a.jpg


58d1402a02d5b.jpg


58d1402a02d6d.jpg


58d1402a02d7e.jpg


58d1402a02d8f.jpg


58d1402a02da1.jpg


58d1402a02db2.jpg


58d1402a02dbf.jpg


58d1402a02dcb.jpg


58d1402a02dde.jpg


Microphone output  :)

58d1402a02def.jpg


58d1402a02dff.jpg


58d1402a02e10.jpg



Validation For GT-2B Style Microphone
Space Left For Transformer , about Length 38mm *  width 50mm approx,  8) :) ;)

58d1402a02e21.jpg


58d1402a02e32.jpg


58d1402a02e43.jpg


58d1402a02a99.jpg


58d1402a02e80.jpg


58d1402a02e98.jpg


58d1402a02ea9.jpg


58d1402a02eba.jpg


58d1402a02ecb.jpg


58d1402a02edc.jpg


58d0281993864.jpg




Let me know,

Cheers,
D.
 

Scrappersa

Well-known member
Joined
Jul 17, 2011
Messages
116
Oh man, I would be totally down for one or even two of these! Ah, this would be so amazing.
 

KasperNyhus

Well-known member
Joined
Jan 18, 2010
Messages
83
Location
Denmark
Yes! That would be sooo cool to have this as a project like your u87!  :p

I have done a little research about micbodys...

u47fet body size is 63mm x160mm but I have not been able to find a body that is spot on yet...

Some sugestions for a original looking clon though:
ADK A-48 71x180
Nady TCM1050 60x180
Omnitronic C-10 60x180
t-bone sct700 58,5x180

Since they are all tube mics the xlr output has to be modded...

This was so much easier with the u87 looking clon...
 

MatthisD

Well-known member
Joined
Feb 22, 2011
Messages
341
Location
Ireland
I've been planning to build this circuit for months but can't I can't easily source the megaohm resistors for the pad/low-cut section so it hasn't been a priority. The T.bone sct700 and similar look-alikes seem most suitable but don't have switches.
I was going to use an se2200a(46.5mm internal diameter), cutting the body(shortening by 31mm) to remove the engraved text and then rub off the red graphic. It has two switches(SPDT) for pad and low-cut which are mounted on a PCB like your U67 so I was going to change one of those to DPDT for the pad.
  Now I'm thinking of building it without the switches and with a fixed -10dB pad. I'm also planning on using a 12:1 DI transformer for the output, the Carnhill could be used to incorporate the single winding 50ohm switch but not exactly essential.
Matt.
 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
Since they are all tube mics the xlr output has to be modded...

This was so much easier with the u87 looking clon...

Cool  Suggestions ,  Thanks Guys,  i am planning on doing on here for sure regarding the switches it will have a internal jumper support for SPDT and a some pads to wire the switch if there is any,  i actually not concerned on having a switching in mic body for this but , i know there is the DPDT switch for the PAD -10db and will also have a jumper support for this as well,  i was thinking trying to fit in the Standard taper body but for sure would like more a U47FET look to it ,
wich mic body is the most common and the easier to get at this point ?  :-\
Dan,
 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
any toughts about this one,  it has no Switch but looks very cool and it is a 3-pin xlr fitted,
Dan,
Note :  Mxl V89 64*185

 

Attachments

  • mxlV89.gif
    mxlV89.gif
    53.1 KB · Views: 238

KasperNyhus

Well-known member
Joined
Jan 18, 2010
Messages
83
Location
Denmark
poctop said:
any toughts about this one,  it has no Switch but looks very cool and it is a 3-pin xlr fitted,
Dan,
wow, that would make a beautiful clon for sure! - now I just have to find a broken one...
 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
Here is a Picture of the Patient  an incomplete U47FET,  it is missing a couple of transistor and also the High Z section,
Briefly alot of Fun ... ;D



 

Attachments

  • FET 47 P.gif
    FET 47 P.gif
    73.6 KB · Views: 369

0dbfs

Well-known member
Joined
Nov 21, 2008
Messages
1,061
Location
Nashville / Atlanta / Memphis / Austin
Wow! You are a mad-man!
I'm still trying to catch up with my u1621's and get the 67's going...
Will need to do two of these tho. You know, kick-drums and horn-sections :)

Two doner-mics for $80:
650167.jpg

http://www.bhphotovideo.com/c/product/650167-REG/MXL_550_551R_550_551_Condenser_Ensemble_Microphone.html

The larger is 47x170mm

The smaller could be fun for franken-mic'ing too.

Cheers,
j

EDIT: Dany, What are the likely PCB dimensions? MXL Cube would also be interesting but it's 55x120.

 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
Thanks J,  The PCB dimension are as small as the U1621 but i could permit to have them wider to attached this promising Mxl550, wich is a good deal for sure ,

i will keep you posted  ,  let those nice suggestion like this one coming  ;D

Dan,

Edit: actually checkin on those 550 mxl kit very very cheap look like a winner for the prototype PCB trial for sure, not sure if it could be any better than that at this moment ,
Dany,
 

KasperNyhus

Well-known member
Joined
Jan 18, 2010
Messages
83
Location
Denmark
poctop said:
Edit: actually checkin on those 550 mxl kit very very cheap look like a winner for the prototype PCB trial for sure, not sure if it could be any better than that at this moment ,
Dany,

Yeah! Definitely a winner for me... A red u47fet - thats gear porn!  :p  ;D
 

tskguy

Well-known member
Joined
Mar 10, 2008
Messages
704
Location
Cary NC
Dany,

You know thats a ribbon right, you may find the internal structure may be a bit difficult in terms of mounting a capsule.

Eric
 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
tskguy said:
Dany,

You know thats a ribbon right, you may find the internal structure may be a bit difficult in terms of mounting a capsule.

Eric

good point i did not tought off that i really would like to see the inside of an mxl 550 type or alctron gt2B for sure any picture s much welcommed,

Anyone would have some picture of the guts of those type of body ? ? :)



Thanks, :D
 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
ISK Tm-66 ?
dimension Still unknown ?
Dan,
 

Attachments

  • tm-66.gif
    tm-66.gif
    29.6 KB · Views: 253

kante1603

Well-known member
Joined
Dec 2, 2009
Messages
1,942
Location
Munich,Germany
...and for us german/european guys

http://www.thomann.de/gb/the_tbone_sct700_roehrenmikrofon.htm

Used it with Max's tube version successfully.

Udo.
 

poctop

Well-known member
White Market Member
Joined
Jul 15, 2009
Messages
2,263
kante1603 said:
...and for us german/european guys

http://www.thomann.de/gb/the_tbone_sct700_roehrenmikrofon.htm

Used it with Max's tube version successfully.

Udo.

Anyone would have a picture or doc about internal dimension or railing of this Nady or T-Bone mic,
Let me know, :)
Dany, 
 

Spencerleehorton

Well-known member
Joined
May 12, 2012
Messages
3,251
Location
Felixstowe, Suffolk, UK
Hi Guys,

Brian Sowter of sowter transfomers has answered all our prayers and made both the U47Fet transformer and the U67 transformer, both will be available within the next few days:

Type 1303 U47FET
Type 1304 U67
Both will be in 34 mm dia x 24 high cans.

prices will follow soon.

regards

Spence.
 

Latest posts

Top