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

[Juan Vargas]

Yes they are. 10 for .99 is worth the 2 week wait!

thank you

 

[Juan Vargas]

Korablev the board on the way Puerto Rico this is for this type of mic body just to remind it
according to Temu website is model TF22 I'm not sure is that is correct

Departed from Facility,Louisville, KY, US

 

[Juan Vargas]

hi guys the board are here in Puerto Rico weehoo! I was checking the alignment for the screw I think they are okay next the parts

 

[untamedfrontier]

Once my arienne k87 arrives I'll post a sound sample comparison between it (in 87 style body), a baifeili 87 (87 style body), and a flat k47 (in u47 style body) all using the ors87 circuit. So far I've really enjoyed both the flat 47 and BFL87, but greatly prefer the flat 47

 

[Khron]

and a flat k47 (in u47 style body) all using the ors87 circuit.

But why would you want to apply the U87 frequency correction curve, to a K47 capsule (and a flat one, at that)?

 

[jp8]

@untamedfrontier, wiIl you optimize low-end cut-off capacitor C12 and high-end roll-off capacitor C13 for each capsule individually? The flat K47 may not even need C13. If you don't optimize the frequency response, you're not doing the capsules justice, IMHO.

 

[micolas]

I am convinced that @untamedfrontier will optimize the degree of de-emphasis or cancel deemphasis, in the ORS87 circuit, depending on the specifics of each capsule used. Even if the headbasket is not identical for all microphones, I'm still curiously waiting for the shootout.

 

[untamedfrontier]

@untamedfrontier, wiIl you optimize low-end cut-off capacitor C12 and high-end roll-off capacitor C13 for each capsule individually? The flat K47 may not even need C13. If you don't optimize the frequency response, you're not doing the capsules justice, IMHO.

For the flat 47, there have been some alterations to part values to get closer to a 847, but eventually I will probably swap out the circuit for something else.

It was mostly built this way out of convenience, since I had leftover ors87 boards, but I like the way it sounds so it may remain as is until I change my mind.

I have 2 other 87s built with similar cap values and I don't hear any difference between them even though one uses a more modern BOM and a j113. I'll likely just pop the Ari k87 into one of those.

 

[Juan Vargas]

Hi guys I just want to document here this mic shell body that I got from Alibaba I was so lucky to get this so cheap it cost me like 9 bucks plus shipping at the moment they don't have discount on shipping yet, anyway for diy circuits is really nice metal feels sturdy enough the head basket is good I didn't know that it will comes with the XLR connector at the bottom and also the 34 mm capsule saddle mount and screws too this are M2.5 type screws? oh the decorative ring is metal not plastic I'm gonna leave a video here and I apologize for my terrible English that is my second language I'm reshaping the layout outline of the PCB ones again to fit into this mic body have a good day guys

link of the mic body "yes I know sometimes it doesn't work"
https://www.alibaba.com/product-det...spm=a2756.trade-list-buyer.0.0.47c676e9pYcIiP

 

[Khron]

I'm reshaping the layout outline of the PCB ones again to fit into this mic body

Why two pairs of insulated pins, though? And those square pads randomly(?) along the ground(?) track...

 

[Juan Vargas]

Why two pairs of insulated pins, though? And those square pads randomly(?) along the ground(?) track...

yes you right I just realize that it only needs one insulator type is just in case the other part# is not in stock in Mouser just in case, the extra one is not really need it and the squares I will remove them I forgot to do it

 

[Khron]

it only needs one insulator type is just in case the other part# is not in stock in Mouser just in case

I understood why the two sizes; i was "only" asking why two of each size would be needed...

 

[Juan Vargas]

I understood why the two sizes; i was "only" asking why two of each size

Khoron I have a bad habit from class AB audio amplifier PCB designs I always look for more options this is not the case in a mic circuit I just realize that now

 

[HalfNote5]

Pics of my build (I will fix pins for Dupoint connectors in second build as they are obstructing but convenient to use at the output):



View attachment 133052

Already fun to measure and compare. I am waiting for Arienne K87 and Vamisound's capsule (the one that is supposed to be Takstar CTS-2).
I can post picture of Vamisound's later. For those I add the de-emphasis ofc.

WAY late to the party on this one, and possibly slightly off topic, but what's the part number on that round little Zener diode? It's unusual, and I kinda wanna get some. = )

 

[Khron]

that round little Zener diode?

Which one?

 

[HalfNote5]

Which one?

Apologies! This one:
Sorry - I should have been more specific.

 

[Khron]

What's wrong with the more "usual" cylindrical glass 0.5W zeners?

 

[HalfNote5]

What's wrong with the more "usual" cylindrical glass 0.5W zeners?

Nothing. I have dozens of them, and they work great. This is just an unusual-looking little component and I was curious about it, that's all. Still am, actually. ^_^
It might be, functionally, nothing special, but it looks odd and I rather liked it.


EDIT: To partially answer my own question, and for anyone curious, it seems to be a package type SOD-57 and they look like they're usually made for higher-wattage applications. Vishay produces some. That looks like it MIGHT be a BZT03 of some sort. Probably similar to a BZT03C24, though it doesn't look like that's the exact part number stamped on it.

https://www.newark.com/vishay/bzt03c24-tap/zener-diode-24v-sod-57-rohs-compliant/dp/56AJ9691​

 

[jp8]

Probably Philips or Vishay BZT03 series, 1.3 Watt or so. Philips type is no longer active. Highly over-specified, as Khron already noted.

 

[HalfNote5]

Probably Philips or Vishay BZT03 series, 1.3 Watt or so. Philips type is no longer active. Highly over-specified, as Khron already noted.

Thanks! And yep, to the over-spec. Found that out when I located some in that form factor. Might be handy for other things but you don't need a 600 Watt zener in a mic. XD

Still, it's a charming-looking little component. Very pleasant to look at and I was curious. Thanks, kindly! ^_^