Charles Turkmen

Re: U47 FET pcb.
« Reply #20 on: May 17, 2012, 02:18:22 PM »
Beat me to it :) I'd already started something similar, but for the 87ish style bodies that are being used for the U1621. Neumann actually made a microphone that was a fet47 circuit in a u87 style body, but I can't find the model number anywhere to bring up a picture.

Here's some:


Charles Turkmen

Re: U47 FET pcb.
« Reply #21 on: May 17, 2012, 02:20:31 PM »
more

Charles Turkmen

Re: U47 FET pcb.
« Reply #22 on: May 17, 2012, 02:21:53 PM »
and final  :)

Re: U47 FET pcb.
« Reply #23 on: May 27, 2012, 11:27:51 PM »
any more info on these igor? are you planning on doing a run of boards?
Adam
only got here by owning a soldering iron and bad life decisions.

gevermil

Re: U47 FET pcb.
« Reply #24 on: July 02, 2012, 02:03:34 PM »
News ?
 ;)
« Last Edit: July 02, 2012, 04:48:32 PM by gevermil »

KasperNyhus

Re: U47 FET pcb.
« Reply #25 on: July 11, 2012, 05:00:17 PM »

Igor

Re: U47 FET pcb.
« Reply #26 on: September 20, 2012, 12:47:48 PM »
OK... First batch of PCB's had 2 minor mistakes,
as I was informed by guy who already built his U-47 (Milan? Please confirm!).

Soooo... Any inteterst?
« Last Edit: September 20, 2012, 12:53:23 PM by Igor »
http://www.ij-audio.com
(new site hopefully will be up in July)

SubhumanRecords

Re: U47 FET pcb.
« Reply #27 on: September 20, 2012, 02:33:18 PM »
I'm in for 1 set..
Cheers!!'

HellfireStudios

Re: U47 FET pcb.
« Reply #28 on: September 23, 2012, 08:48:16 AM »
What kind of price are you going to set for these PCB's? Are they being done in collaboration with poctop's DIY fet47 project? What are the final PCB dimensions?

BTW, if you intend to use the fet47-style mic for bass amps and kick drums, the lower polarization voltage/sensitivity is actually a good thing.

-James-
"Tommorrow is just yesterday in reverse. Just like friends are enemies in reverse." -Gary Busey

Re: U47 FET pcb.
« Reply #29 on: September 23, 2012, 11:34:41 AM »
What kind of price are you going to set for these PCB's? Are they being done in collaboration with poctop's DIY fet47 project? What are the final PCB dimensions?

BTW, if you intend to use the fet47-style mic for bass amps and kick drums, the lower polarization voltage/sensitivity is actually a good thing.

-James-

I am not in collaboration with Igor but I wish I had  :( , actually i took over the project because it has been left on the Bench for several months ,  but if Igor want to go ahead also, that is not a problem at all , people will have choice for this project wich is a good news. ,  just need to remind that the PCB High impedance section isolation strategy  is a critical aspect of my design and i am hoping to make the demonstration a bit later this week, and will also supply a complete BOM and phototutorial on how it will be assembled ,
Sincerly  , :)
Dan,




la-2a

Re: U47 FET pcb.
« Reply #30 on: September 23, 2012, 02:23:59 PM »
Hi, yes Igor ...... except of these 2 little bugs .... (I am sure you already fixed it ) i can  confirm the Microphones
I build with the Boards sound great ;).

Al the best M.

HellfireStudios

Re: U47 FET pcb.
« Reply #31 on: September 23, 2012, 06:38:01 PM »
Thanks, Dan.
"Tommorrow is just yesterday in reverse. Just like friends are enemies in reverse." -Gary Busey

Igor

Re: U47 FET pcb.
« Reply #32 on: September 24, 2012, 05:35:41 PM »
Well, dudes. In case we comparing the posts dates here:

http://www.groupdiy.com/index.php?topic=49758.0
 Topic: D-U47 FET Microphone Project PCB ( Coming Next week )  (Read 2141 times)
« on: 2012-09-04, 08:34:31 »

and here:
http://www.groupdiy.com/index.php?topic=48056.0
 Topic: U47 FET pcb.  (Read 3460 times)
« on: 2012-03-15, 03:22:56 »

It is fine with me to give people more options.

@poctop : if you have a reason I shouldn't offer my PCB's, just drop me a mail.
If you need price fixing, no prob as well. If I can offer same price as yours incl. shipping, let's stick to it - I appreciate your work too.

U47 was built at this nicey black PCB at least 2 times, AFAIK.
The PCB was designed for my friend - he actually started the idea with this PCB,
I just draw it and brought files to factory and asked for best quality they can offer for high impedance circuit.
I wanted to make a mic for me, but unfortunately plans have changed
(passed some time at hospital with heart probs, recovery, blabla, than got a bunch of work). Well, in 2013.

I asked some photos from Milan, hope, he will post them here.

Funny, but:

Quote
just need to remind that the PCB High impedance section isolation strategy  is a critical aspect of my design

Yes, it is MUST and BASIC thing... Otherwise the mic will work incorrect.

The PCB on photos made from very high quality material. Tracks spaced well.
Wash it with IPA, take down residue with pressed air, till it shines, dats all.

Want to mind piezo-ceramics in case of whatever. Microamperes and kilovolts. Same sh&&t, same strategies, well, already been there)

Well, the picture of PCB (comp side and bottom side, all built at one PCB):

(just click at attached picture).
http://www.ij-audio.com
(new site hopefully will be up in July)

Dylan W

Re: U47 FET pcb. Already here.
« Reply #33 on: September 24, 2012, 07:03:46 PM »
Thanks to both Igor and Dany for putting together a PCB--options are a good thing for the DIYer. Igor, do you have an idea on size, re which bodies your pcb will fit?

Re: U47 FET pcb. Already here.
« Reply #34 on: September 24, 2012, 10:50:34 PM »
GOSH WHY DO I HAVE TO BE BROKE!!! i want 2 from both of yall!! and mparts ahs that brass 67 capsule. DIY will be the death of me..
Adam
only got here by owning a soldering iron and bad life decisions.

Igor

Re: U47 FET pcb. Already here.
« Reply #35 on: October 11, 2012, 04:05:29 PM »
I put this project on hold due some unexpected issues, probably addressed to FET, untill I assemble one mic and test it for some days in the studio.
In case of whatever: which FET can be direct replacement to Neumann 8280800022.4?
http://www.ij-audio.com
(new site hopefully will be up in July)

HellfireStudios

Re: U47 FET pcb. Already here.
« Reply #36 on: October 11, 2012, 05:06:53 PM »
The other U-47 FET thread may have a BOM that could answer your question. If not, Poctop tends to be very foward and helpful with details. Just ask him.

-James-
"Tommorrow is just yesterday in reverse. Just like friends are enemies in reverse." -Gary Busey

Igor

Re: U47 FET pcb. Already here.
« Reply #37 on: October 11, 2012, 05:08:58 PM »
Did he already built and tested the mic?
http://www.ij-audio.com
(new site hopefully will be up in July)

HellfireStudios

Re: U47 FET pcb. Already here.
« Reply #38 on: October 11, 2012, 05:26:41 PM »
Page 3 Reply #49

He is using the 2N3849 with a slight change to allow for biasing the FET.

-James-
"Tommorrow is just yesterday in reverse. Just like friends are enemies in reverse." -Gary Busey

Moby

Re: U47 FET pcb. Already here.
« Reply #39 on: October 13, 2012, 12:56:17 PM »
I put this project on hold due some unexpected issues, probably addressed to FET, untill I assemble one mic and test it for some days in the studio.
In case of whatever: which FET can be direct replacement to Neumann 8280800022.4?
what abut sk107? I'm sure it have to be low noise selected but it's maybe worth of trying.