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

[Korablev]

A very important addition, which was mentioned in this thread on pages 5-8.
Important.
If you are using a JFET LSK189, it has a reverse pinout, unlike the 2n3819.
It is important to pay attention to this point, since the LSK189 will work in an inverted state, but its operating mode will be incorrect.




In the end, I left the JFET LSK189 in this state:



In total, I desoldered the part and bent the central leg several times. But the legs turned out to be of high quality and withstood all the abuse. This does not always happen, and there are cases when the leg breaks off near the case, which is very, very bad. You need to be very careful.

 

[Juan Vargas]

A very important addition, which was mentioned in this thread on pages 5-8.
Important.
If you are using a JFET LSK189, it has a reverse pinout, unlike the 2n3819.
It is important to pay attention to this point, since the LSK189 will work in an inverted state, but its operating mode will be incorrect.

View attachment 144415

View attachment 144416
In the end, I left the JFET LSK189 in this state:

View attachment 144417

In total, I desoldered the part and bent the central leg several times. But the legs turned out to be of high quality and withstood all the abuse. This does not always happen, and there are cases when the leg breaks off near the case, which is very, very bad. You need to be very careful.

oh ok thank for let me know so Q1 in that orientation works correctly? is that the case then I have to installed like that then ok ok anyway the GATE leg will be in a floating mode gotta go back and read 5 - 8

 

[Khron]

Q1 in that orientation works correctly? is that the case then I have to installed like that then

Well, it depends what part number (and pinout) the JFET is, doesn't it? I don't think it's wise to make any "blanket statements"... The datasheet for the respective part number is "holy", and that's the end of it (imho).

 

[Juan Vargas]

Well, it depends what part number (and pinout) the JFET is, doesn't it? I don't think it's wise to make any "blanket statements"... The datasheet for the respective part number is "holy", and that's the end of it (imho).

"blanket statements"... agree totally yes, I will know after I put it together

 

[Juan Vargas]

but BF862 is no longer in production and is a SMD device?

 

[Khron]

ja du hast recht es wird nicht mehr hergestellt ja smd wäre auch kein problem vielleicht finde ich noch andere mit guten rauschwerten ich habe einen j211 fet getestet der war extrem leise im vergleich zum lsk 189 ich frage mich warum die so unterschiedliche pegel angeben steht das auch irgendwo

I thought English was the official language of this forum..? Despite whatever one-way auto-translating your web browser might be doing...

 

[Juan Vargas]

mic test at least translate to English too I think is the first time I see that dialect

 

[eso]

I thought English was the official language of this forum..? Despite whatever one-way auto-translating your web browser might be doing...

ja du hast recht es wird nicht mehr hergestellt ja smd wäre auch kein problem vielleicht finde ich noch andere mit guten rauschwerten ich habe einen j211 fet getestet der war extrem leise im vergleich zum lsk 189 ich frage mich warum die so unterschiedliche pegel angeben steht das auch irgendwo

yes you are right it is no longer manufactured yes smd would also be no problem maybe I can find others with good noise values I tested a j211 fet which was extremely quiet in comparison to the lsk 189 I wonder why they specify such different levels is that also written somewhere


Google is your friend.

eso

 

[Khron]

or send the file to my e-mail

It's usually not a great idea to publicly list your email address in plain text (unless you're a fan of getting tons and tons of spam emails)...

 

[Juan Vargas]

It's usually not a great idea to publicly list your email address in plain text (unless you're a fan of getting tons and tons of spam emails)...

ok I deleted

 

[Juan Vargas]

I just hope those humongous things fit inside that mic body...

yes Khron it did fit I just finish the build

 

[Juan Vargas]

I just finish the build and a few minor problems I got the 1uF main cap with different sizes options was too tall but I manage to close the mic body, and the cylinder has a conical shape and was too close to that cap also I place the Q1 too far away from the insulator on my layout design, since I don't have proper tools or better say just a digital multi meter I set the FET to 15V DC oh the 1G ohm resistor is no problem. please let me know if this is ok is the first time that I'm building a microphone

I use 150pF for C6A tested and I like the way it sound I then add a 10pF cap in parallel with C6A and I didn't like the sound I just cut one of the legs "no m gusto para serles sincero" = "I didn't like it to be honest" the other cap C5A remains the same value 33nF the R* I haven't installed yet, and then updated Layout move Q1 higher and on trim pot I add a second option of trim pot.

In my opinion this was one of the best experience building this design I'm not and expert on music or sound production but this is better than my MXL 770 old mic lovely! later I'm gonna populated the first PCB version for this mic body the blue one YES Khron the wiring is horrible I see you! I know is 22 AWG PTFE should be like 26 to 28 AWG I will keep posting later for the blue TF22 mic body later good day guys

 

[Korablev]

Well, I finally waited for the missing parts, and finally mounted everything correctly on the new board. On the old board, because I had to install large parts, I drilled out some holes, which caused some contact pads to come off. It's very good that the Chinese comrades sent 6 boards at once! I used film Wima C6 220p, C5 330n. Electrolytic capacitors - Panasonic 22uF 63v. (still, the case size turned out to be a little wider than required, but it's not a problem) Vishay resistors. The capsule in my microphone is from an expensive Chinese clone of the u87.

I would also like to note that the C6 220p produces a slightly muddy sound (it has to be corrected with an external equalizer of the mixing console to +2 - +3 dB. And the C6 150p produces a bright color. Therefore, if possible, I want to try something in the middle, about 180p at the C6 position.

In general, of course, I am a supporter of assembling things like this microphone only on high-quality components, so I am slowly starting to hunt for rare Allen-Bradley, Nichicon, Vishay Spragu, Ohmite, and other components.

I really like the character of the sound. Many thanks to the ORS project!!! and separately to Juan Vargas for the provided Gerber files!!! The experiments will continue, as there are still 4 boards left!

 

[Juan Vargas]

his this is how I'm gonna use the ORS 87 circuit in my gaming here are some photos that I took today I'm so happy the video show the purpose of the ORS 87 microphone I'm using Tascam US-1x2HR and OBS to record game play and some plugins to eliminate some background sounds like Nvidia Brodcast y'all have a great day!

 

[Juan Vargas]

nice Korablev amazing! the C6A I keep it as 150pF and I try 10pF in parallel with C6A and I didn't like the sound you mention that with external equalizer? I only have this Tascam US-1x2HR anyway is fine with 150pF on C6A and glad that I help Korablev thank you

 

[Korablev]

отличный Korablev, потрясающий! :хихикать: я оставил C6A на 150 пФ и попробовал 10 пФ параллельно с C6A, но мне не понравился звук, о котором вы упомянули, с внешним эквалайзером? у меня только этот Tascam US-1x2HR, но он нормально работает с 150 пФ на C6A, и я рад, что помог Korablev, спасибо

To amplify the microphone I use a Yamaha 01v96 console. Microphone correction in the photo. I also use a light compressor to slightly prepare the audio signal in advance, before production.

 

[Juan Vargas]

oh yes do more experiments I change the layout one last time and this fix a few minor locations of the parts Q1 I move it up so the gate of Q1 is gonna be closer to the insulator.

I fix all 3 electrolytic caps the were 2.54 mm PD now they are 2.5 mm, the trim pot I change the macro so it will accommodate two types of trim pots, the NTE10/3 tiny transformer I got one that I need to measure the winding former plastic part ears in mm to see the separation of the holes so I need to make them closer so they will hug the winding plastic former better anyway I'll keep posting for the next mic build with the TF22 body later have a great day y'all

 

[Juan Vargas]

To amplify the microphone I use a Yamaha 01v96 console. Microphone correction in the photo. I also use a light compressor to slightly prepare the audio signal in advance, before production. oh my God that is more than what I have now crazy indeed

View attachment 145059View attachment 145060View attachment 145063

 

[Juan Vargas]

this is all I got I'm poor man