U47FET in BM800 microphone body

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mihi_fuchs

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Sep 21, 2019
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Austria / Europe
I started DIY three years ago right before all the lock down action started and as it provided quite some nice distraction I had quite some projects going. In the dropbox link below you can find my attempt on transferring a U47FET based layout to the BM-800 donor body.
The donor body is particularly cheap and does the job well in my opinion.

In the link below you can find the BOM, a detailed building guide and some sound samples recording kick and snare with the mic. The sound samples are unprocessed. Both instruments were recorded by the U47FET-based clone in the BM800 body.

Here is the link:

IMG_9969.jpegIMG_9966.jpegIMG_0092.jpeg
I had to split the curcuit part into two because of the limited space. I used a MAIKU U47 capsule, a 3u audio GZT-47 transformer (ratio 6.5 : 1) and a 3D printed capsule holder. Most parts were obtained from mouser, the styroflex capacitors were purchased from reichelt.at and budgetronics (for details see the BOM in the dropbox folder).

Last but not least the project has been highly influenced and some solutions were simply copied from members of this forum (e.g. matador, khron, poctop, chunger, and others) - thanks for all of their posts, ideas and solutions that they have shared over the times.

As there has been already a discussion about the BM-800 donor body maybe the sound samples prove helpful to some forum members.

Thanks again for all the nice hours I spent browsing through this forum,
all the best
mike
 
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mihi_fuchs

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Joined
Sep 21, 2019
Messages
26
Location
Austria / Europe
Looks nice! Are you planning on selling the cb's as well?
Thanks. I still have left a few spare ones and the same is true for the U87 (I am currently writing up the building guide too). I can put the spare ones on the black market post if you like.

I'm based in AUT so delivery costs to Belgium should be ok ...
 

wlinart

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Jan 19, 2012
Messages
169
Location
Belgium
Thanks. I still have left a few spare ones and the same is true for the U87 (I am currently writing up the building guide too). I can put the spare ones on the black market post if you like.

I'm based in AUT so delivery costs to Belgium should be ok ...
I'm definitely interested, i've got a spare bm800, transformer and capsule at the moment
 

mihi_fuchs

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Joined
Sep 21, 2019
Messages
26
Location
Austria / Europe
I'm definitely interested, i've got a spare bm800, transformer and capsule at the moment
I posted the PCBs on the black market. Here's the link to the thread: PCBs for U47FET in BM800 donor bodies

Feel free to contact me at any times via the platform for selling - that's the easiest way.

Thanks again for your encouragement and your interest. If you have PCBs of other projects around I would be also interested in exchange maybe ;-) ...

Cheers
Michael
 

mihi_fuchs

Active member
Joined
Sep 21, 2019
Messages
26
Location
Austria / Europe
As one of the new members pointed out, I forgot to describe the PAD and Low Cut function. These can be simply jumpered on the board. Additionally one can use the pins for jumpering to wire the PCB to a real sitch. More details can be found in the new Building Guide in the dropbox folder (Version 1_1).

Apologies as I forgot to include it right away.

Cheers Michael
 

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