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

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



Fits also Alctron Gt-2b style.




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.






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.




























































































Microphone output 








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

























Let me know,

Cheers,
D.

Oh man, I would be totally down for one or even two of these! Ah, this would be so amazing.

Yes! That would be sooo cool to have this as a project like your u87! 

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...

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.

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

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

Click to expand...

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,

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

poctop said:

any toughts about this one,  it has no Switch but looks very cool and it is a 3-pin xlr fitted,
Dan,

Click to expand...

wow, that would make a beautiful clon for sure! - now I just have to find a broken one...

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

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:

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.

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,

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,

Click to expand...

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

Thanks JB,

Just seen the mxl R144 Kit also ,

http://www.ebay.com/itm/New-in-Box-MXL-R144-Recording-Studio-Ribbon-Microphone-/370645616522?pt=US_Pro_Audio_Microphones&hash=item564c33478a

the kit does not include the Franken mic but there is a nicer shockmount with it it would seems,
it is a little less eye catching  ;D let say,
But well it depends on the intention at this point,  ;D

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

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

Click to expand...

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,

ISK Tm-66 ?
dimension Still unknown ?
Dan,

...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.

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.

Click to expand...

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

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.

Wow very cool.

Cant wait to see more! ;D

Yeah very very cool!