OPEN SOURCE DIY Mic Project - ORS 87 - Stripped Down u87

[eso]

Thanks! Neutrik NTE 10/3 in both 87 bodies, UTM 0547F in the 47 body. Neutriks are in the 10:1 configuration

I usually use Cinemag transformers since they're a local company to me. CM-13113 for this build

https://cinemag.biz/mic_output/PDF/CM-13113.pdf

eso

 

[grvandergraaf]

I made a quick video featuring a few different builds of the ORS87 compared. Please enjoy (or don't, entirely up to you):

I had yet to do an all at once comparison and found this to be quite interesting. Video features BaiFeiLi 34mm capsule, Arienne K87, and Flat47, with Warm Audio WA-87 R2 as an additional flavor to compare against.

I listened to that. The only mic that stood out was the Warm Audio. The other three basically sounded the same to my ears. The Warm Audio has much less bottom end. But to my purely subjective perception it sounds way better. Quite to my surprise because I always thought that company was selling an image more than quality.

 

[jp8]

I made a quick video featuring a few different builds of the ORS87 compared. Please enjoy (or don't, entirely up to you):

I had yet to do an all at once comparison and found this to be quite interesting. Video features BaiFeiLi 34mm capsule, Arienne K87, and Flat47, with Warm Audio WA-87 R2 as an additional flavor to compare against.

Really nice comparison! BaiFeiLi and Arienne's K87 sounded the same to me and quite natural and full. Flat47 was a bit dark. Curious how would it sound in another, non-U47 style body. WA was terrible. Sounds almost like a cheap transistor radio. Or like a flatscreen TV without a soundbar or decent HiFi set connected. Crap.

 

[Juan Vargas]

hi guys this is how some of the part look on the PCB the insulator 534-11154 Mouser fits really well and the 1G ohms fits well and the tiny transformer is okay

 

[Korablev]

Hello! My parts arrived today, and of course I couldn't resist assembling the microphone. Everything worked the first time, I was surprised. Some parts for some reason turned out to be very large, and I had to be cunning to place them in the case so that the lid would close. But I'm still happy that everything worked out, the sound is unusual after the MicParts S87, but at the same time it is flexible, fits well into the mix (I do radio production). Once again, many thanks to the community and the forum for this wonderful opportunity to assemble a replica of the legendary 87!!! Perhaps later I will prepare mixes with a comparison of microphones. In my park there is Goodfly U47, MicParts S87, AKG c3000, and now ORS 87.

 

[Khron]

Some parts for some reason turned out to be very larg

Well, you're unlikely to need 160V or 250V capacitors in a phantom-powered mic, but what do I know?

 

[Juan Vargas]

Hello! My parts arrived today, and of course I couldn't resist assembling the microphone. Everything worked the first time, I was surprised. Some parts for some reason turned out to be very large, and I had to be cunning to place them in the case so that the lid would close. But I'm still happy that everything worked out, the sound is unusual after the MicParts S87, but at the same time it is flexible, fits well into the mix (I do radio production). Once again, many thanks to the community and the forum for this wonderful opportunity to assemble a replica of the legendary 87!!! Perhaps later I will prepare mixes with a comparison of microphones. In my park there is Goodfly U47, MicParts S87, AKG c3000, and now ORS 87.

that is amazing Korablew the electrolytic caps are are 2.54 mm PD pitch distance and 63V DC would be fine I think I see the transformer fist really well I had to order again parts because the trim pot has the wrong foot print should be this one is my mistake, so how is the sound? and I update the PCB but I'm not gonna order till I build this one good day Korablew happy to see your post man

 

[Korablev]

Well, you're unlikely to need 160V or 250V capacitors in a phantom-powered mic, but what do I know?

Well, I ordered parts according to this table. I have very little experience in choosing. But it's okay, if I want to assemble a second microphone, I'll know what to pay attention to. )))

 

[Khron]

Well, I ordered parts according to this table.

Ouch, who put that together? Nevermind why...

 

[Juan Vargas]

Well, you're unlikely to need 160V or 250V capacitors in a phantom-powered mic, but what do I know?

this is why take longer to me to order t

Well, I ordered parts according to this table. I have very little experience in choosing. But it's okay, if I want to assemble a second microphone, I'll know what to pay attention to. )))

oh ok I see when ordering parts go here and check data of the larger parts in Mouser or Digikey but anyway is a good thing you put it together look so nice even with those grandes big caps awesome man

 

[Juan Vargas]

Ouch, who put that together? Nevermind why...

Well, I ordered parts according to this table. I have very little experience in choosing. But it's okay, if I want to assemble a second microphone, I'll know what to pay attention to. )))

Korablev on Q1 what part number is that one? I see that you rotated in a different way

 

[Korablev]

Korablev on Q1 what part number is that one? I see that you rotated in a different way

1​

LSK189​

JFET​

Ultra Low Noise, Low Drift, Single N-Channel JFET​

722-LSK189TO923LBK​

LSK189-TO-92-3L-BK​

It's really my mistake... But why does it work? ))))

 

[Juan Vargas]

1​

LSK189​

JFET​

Ultra Low Noise, Low Drift, Single N-Channel JFET​

722-LSK189TO923LBK​

LSK189-TO-92-3L-BK​

It's really my mistake... But why does it work? ))))

oh man this is weird I'm not sure what to tell ya on the next board make sure the orientation the FET face is correct, you was not drinking hot fire Vodka dear friend I see you

 

[Korablev]

I fixed this annoying oversight, the microphone works well again! Apparently JFet can function in different positions, and this is very good! ))) P.S. Although no. Now the microphone produces an ultra-low signal.

 

[Juan Vargas]

I fixed this annoying oversight, the microphone works well again! Apparently JFet can function in different positions, and this is very good! )))

nice man hey thank you for sharing the build and pictures this make me so happy to see it working

 

[Khron]

Apparently JFet can function in different positions, and this is very good! ))) P.S. Although no. Now the microphone produces an ultra-low signal.

Have you re-done the biasing?

 

[Korablev]

nice man hey thank you for sharing the build and pictures this make me so happy to see it working

Yes, JFet works both ways, and the ultra-low signal was due to the fact that it was necessary to set the correct offset with the trimmer.

 

[Juan Vargas]

Yes, JFet works both ways, and the ultra-low signal was due to the fact that it was necessary to set the correct offset with the trimmer.

Korablev can I ask for permission to use your build photos on my YouTube channel CoquiAudio? I just want to show those nice photos

 

[Korablev]

Korablev can I ask for permission to use your build photos on my YouTube channel CoquiAudio? I just want to show those nice photos

Well of course yes! I'm always very happy to help with something!!!

 

[Juan Vargas]

thank you so much Korablev this means a lot to "muchas gracias" = thank you so much, and have a great good day dear friend and have fun