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[Sticky] USB-C Microphone (official topic)

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tekken
(@tekken)
Posts: 4
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My mic is shit, It can pick up a little sound If i shout into it, but mostly static. ☹️

I have no idea how to diagnose the problem really. 

 
Posted : 04/07/2022 3:10 pm
plebber
(@plebber)
Posts: 1
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@ridian 

 Wondering if u got this problem fixed. I'm having the same issues as you and have no idea what the problem is apart from the possibility of having bad capacitors.

 
Posted : 13/07/2022 2:29 pm
DIY Perks
(@diyperks)
Posts: 62
Estimable Member Admin
Topic starter
 
Posted by: @tekken

My mic is shit, It can pick up a little sound If i shout into it, but mostly static. ☹️

I have no idea how to diagnose the problem really. 

Could you share a picture of the front and back of your PCB?

 

 
Posted : 14/07/2022 9:40 am
tekken
(@tekken)
Posts: 4
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@diyperks 

Hi Matt, I have two questions:
Did you do any post processing noise removal in your video?
If you would remove all your brass meshing would your mic be totally unusable due to noise interference or how bad would it get?

front
back

This is my testing setup that has some obvious interference flaws currently, but they seem minor to me. Im doubting it would all get resolved with tighter connections. The DIP8 THAT chips were sold out so I only managed to get the SO8 chip, which happend to be incredibly tiny, making it a pain to solder.

 

 
Posted : 14/07/2022 11:10 am
Gummibar17
(@gummibar17)
Posts: 1
New Member
 

Hi Matthew,

I will soon need a microphone and would like to re-enable yours. On the old forum was a subcategory for an improved version. Unfortunately, I can't find them anymore. Are you making a new video soon or are you showing a new Intervace with Mute and headphone input the next time?

 

Then I would wait.

 

Yours sincerely guomi

 

 
Posted : 14/07/2022 10:13 pm
Leob
 Leob
(@leob)
Posts: 1
New Member
 

I haven't started anything yet, but I was wondering if there was a way I could skip the pre amp part, and make it an xlr mic instead, I already have an interface but is takes xlr. I look forward to building this but I am also wondering if this mic would be suitable for recording loude wind instruments such as the saxophone, I know that is more of a preference thing, but the world of instrument recording is big and convoluted and I just want something that would be better than an sm58. 

 
Posted : 14/07/2022 10:32 pm
goose
(@goose)
Posts: 1
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Someone already asked for it, but the link seems to have gone bad. Are there any other options for the rotary switch? Only part that I still can't find.

 
Posted : 15/07/2022 5:44 am
Rayamando
(@rayamando)
Posts: 1
New Member
 

Hello everyone 😀
I'd really like to know if there is a reason as to why not to use a Potentiometer instead of the rotary Switch?
Other then that i will have to wait for my Parts to arrive as most of them seem to be rather seldom if you try to source one to one Parts.. but i managed to find a few

This post was modified 2 months ago by Rayamando
 
Posted : 19/07/2022 8:10 pm
millerian
(@millerian)
Posts: 1
New Member
 

Hey everyone, I was wondering if I could get some clarification on a part of the video that I don't quite understand.

When assembling the pre-amp, Matt glues the audio interface to the stripboard, leaving a red, black, and white wire, like so:

1

But what gets plugged into the stripboard is the red wire and a copper mash:

2

Are these copper wires a combination of the black and white wires? I'm very new to electronics, so any help is appreciated!

 
Posted : 20/07/2022 10:07 pm
UnspokenTube0
(@unspokentube0)
Posts: 1
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@millerian

WhatsApp Image 2022 07 21 at 11.31.02 PM

i think that the Mic Out (red wire) it connects to the red and white, im building mine next week, ill let you know if that works 

 
Posted : 23/07/2022 4:20 am
Parker
(@parker)
Posts: 3
New Member
 

Ok the mic works great, but... the audio is too quiet. All parts are the same as the video minus the transistor(I'm using the j111 as its easier to come by and cheaper), my USB audio interface (rc30-0205) yes the razer THX one, and I'm using a few 2w resistors in place of 1/4w. 

Issues I've found.

  1. Rotary switch doesn't appear to change volume (gain).
  2. the mic still works when I rotate the THAT 180 in its socket, I find this odd as I have checked its data sheet and I feel like this shouldn't work. I am however an amature at this.
  3. blowing into the mic hard will give me about 15 seconds of clear crisp audio as it slowly fades back to near inaudible. While having the drain and source of the mic hooked up to a multi meter I can see that the voltage goes from 22v after blowing (great loud audio) and fades to 4.5v (quiet). I'm at a loss of why this is.
  4. I've been switching out some of the resistors (shown in images) with lower ones and I get slightly higher base volume. this does however make them very hot when plugged in for a while (15 min) hence the 2w resistors for testing.

 

I do my testing as shown outside its case with only the mic and its wire insulated in the brass mesh and printed mic capsule housing(black cylinder). I get very minimal interference.

 

I'm at a loss of how to make the volume increase from here please help.

 

IMG 2484
IMG 2483
IMG 2482
IMG 2481
IMG 2480
 
Posted : 23/07/2022 9:57 pm
chinhnguyen
(@chinhnguyen)
Posts: 1
New Member
 

hi, anyone with more detailed schematic please help me. I want to draw the circuit more clean but I dont know the information of these components. i saw a circuit on fake diy perks bilibili channel, they change a few things, no volume knob.

i want to do the same as the original but the schematic confused me

mic

 

 
Posted : 02/08/2022 11:46 pm
MinHD
(@minhd)
Posts: 4
New Member
 

Hello people, I made the whole circuit but I tried to connect an audio socket to the pre-amp Ground and Out, which I can then connect to the usb audio interface. Here is an image even showing which pins of the socket I used (referenced the datasheet).

Example image audio socket

I did this so I don't have to snip off the cables from the usb audio interface, leaving it intact just in case.

What I want to know is if this would normally work, assuming everything else works. I've tested this setup and don't hear anything so I want to make sure if the part from the audio socket could be the cause. I suspect I don't have to do anything with the red and white plug from the usb audio interface, do I? The video didn't show exactly how to connect the cables on this part of the build.

This post was modified 2 months ago 2 times by MinHD
 
Posted : 05/08/2022 12:55 pm
Parker
(@parker)
Posts: 3
New Member
 

@minhd I am using a similar configuration with a 4 pole audio jack and mine works (not great sill but i am getting audio) and what you have going on here should be fine. The red and white plugs are audio left and right and will not be used. if your not getting a signal coming through you may have the wrong pins hooked up. I would also go through with a multimeter and check to make sure all your solder connections are good.

 
Posted : 06/08/2022 12:13 am
tekken
(@tekken)
Posts: 4
New Member
 
Posted by: @minhd

Hello people, I made the whole circuit but I tried to connect an audio socket to the pre-amp Ground and Out, which I can then connect to the usb audio interface. Here is an image even showing which pins of the socket I used (referenced the datasheet).

Example image audio socket

I did this so I don't have to snip off the cables from the usb audio interface, leaving it intact just in case.

What I want to know is if this would normally work, assuming everything else works. I've tested this setup and don't hear anything so I want to make sure if the part from the audio socket could be the cause. I suspect I don't have to do anything with the red and white plug from the usb audio interface, do I? The video didn't show exactly how to connect the cables on this part of the build.

Wondering that myself.
You have 3 options(on the 3,5 jack): left only, right only and both. Try all three?

I tried left and right, maybe both worked not sure but I have only a faint pickup of voice with massive interference. So got to solve the interference first before i dabble on.

I got the same EzCap thing.

This post was modified 2 months ago by tekken
 
Posted : 06/08/2022 1:48 pm
mmorton235@gmail.com
(@mmorton235gmail-com)
Posts: 1
New Member
 

@jsdavis I was wondering if you had any success with the boards you made and if you wouldn't mind explaining them a little bit

 
Posted : 08/08/2022 4:21 am
DrStoooopid
(@drstoooopid)
Posts: 2
New Member
 
Posted by: @diyperks

 

 

This project covers everything from sourcing a good-sounding microphone capsule to building a frame for it and even including a USB interface so it can be used on any modern device whether that be a laptop or a smartphone.
 
 

One thing I'm missing. I'm not seeing either in the video or the bill of materials, what size mesh is best for this project. I bought a fine mesh which I *thought* looked right, it's way too fine, and then bought a courser mesh, and it just doesn't look right.

 
Posted : 08/08/2022 10:30 pm
RevvRav
(@revvrav)
Posts: 1
New Member
 

I don't have a motor i can dismantle to get the enamelled wire, what guage would you say it is as i can buy it from ebay for a few quid..

Enamelled wire

 
Posted : 09/08/2022 11:27 am
DrStoooopid
(@drstoooopid)
Posts: 2
New Member
 

@revvrav I think I ordered 28ga from Amazon. 

Though, I did find out that you have to be careful which soldier wick you use, some of them are just flat ribbon, others are tubular. Another thing to note is most of them are pre-fluxed, so you either have to carefully work it open, or cook it in a toaster oven at a high enough heat to melt the flux, but not so high that it color changes the metal.

 
Posted : 10/08/2022 3:31 am
MinHD
(@minhd)
Posts: 4
New Member
 

@parker Thanks for the reply. I too believe the audio socket should be fine. I'll try checking the soldering connections and see if something might be wrong there.

 
Posted : 10/08/2022 9:36 pm
MinHD
(@minhd)
Posts: 4
New Member
 

@tekken I noticed when comparing your schematic to mine that the two 22uf capacitors on mine are facing the other way with the minus side to the left. Seeing how yours and the ones in the video are facing right I think that might be the cause. I'll fix that and see how that changes things.

 
Posted : 10/08/2022 9:39 pm
DerpFace
(@derpface)
Posts: 2
New Member
 

Hey everyone,

a couple of questions have popped up in my attempt to build the microphone. I'm completely new to this and this is my first build, so I apologize in advance if any of this is noob stuff.

First of all, would this build work with polarised 22uF capacitors? If so, where would the poles be?

I was also wondering why the enameled copper wire was only used for the first bit of the cable, couldn't I use the enameled wire all the way? If not, is the desoldering wire soldered to the copper wires in the audio cable? It's not mentioned in the video, so I'd rather ask beforehand.

Lastly, I'd like to exchange the brass with wood, wherever possible. Is the brass ring around the capsule a necessity? It was mentioned that it would act as a grounded shield around the capsule, I guess that wouldn't work with wood.

Thanks in advance!

 

This post was modified 1 month ago 4 times by DerpFace
 
Posted : 13/08/2022 10:25 pm
MrBlobfisch
(@mrblobfisch)
Posts: 2
New Member
 

@derpface 
I think you can use the enamelled wire all the way to the preamp and yes you should connect the desoldering wick to ground. (to either a cable or the shielding)

If you connect the 2 capsule meshes together and connect them to ground it should be fine

 
Posted : 18/08/2022 8:54 pm
MrBlobfisch
(@mrblobfisch)
Posts: 2
New Member
 

@unspokentube0 

does that work?

can anyone clarify which 2 cables go from the USB audio interface to the preamp board?

sadly i cant find any datasheet for the av202-B usb audio interface so im unsure

This post was modified 1 month ago by MrBlobfisch
 
Posted : 18/08/2022 9:06 pm
Tyson
(@tyson)
Posts: 2
New Member
 

I'm fairly new to doing this kind of stuff but I'm going Into school for it so I'm hoping to learn a bit more, but I have an issue that I'm not sure how to solve, I've soldered everything together using all the parts listed(except my 22uf capacitors are rated for 100v rather than 35v) but instead of a rotary switch I used a potentiometer, now when I plug everything in except the potentiometer the mic doesn't do anything but when I plug in the potentiometer my mic only works whenever I touch the ground to any sort of metal, but my mic still won't Pick up my voice rather it just pics up the sound of the wire tapping the metal or moving against it, if you have any suggestions please let me know

 
Posted : 26/08/2022 10:57 pm
Tyson
(@tyson)
Posts: 2
New Member
 

@redrevo117 I am having a similar problem where instead of a phone resistor I'm using a potentiometer, did you ever figure out and if so what did you do to fix it?

 
Posted : 27/08/2022 8:30 pm
DerpFace
(@derpface)
Posts: 2
New Member
 

So, im almost done with the build, but two questions have come up:

First, with the audio interface:

When the audio interface was glued down, there were only a red, black and white wire left. (image below)

82 1

 But only a red wire and a copper wire get plugged in:

83 2

So i guess one of them is GND and the other two make up the audio output. Which two of them need to be soldered together to make the audio output?

Second, the breakout board:

My breakout board only has one point each for VBUS and GND, while his has two for each, one for the USB cable and the other to supply power. Can I solder two GND wires to one GND point and two VBUS wires to one VBUS point?

51l60mTYOzL
Screenshot 2022 08 31 013852

Thanks in advance!

 
Posted : 31/08/2022 3:01 pm
bjnRussell
(@bjnrussell)
Posts: 1
New Member
 

Hi! Ive recreated this circuit in different configurations on the breadboard about 3 times to ensure the board wasnt faulty, also checked extensively for shorts and Ive tested connections with a multimeter. From my readings I could confirm that I was getting 5 volts from the USB, +15V and -15V from the NMA0515SC, and 20V across the transistor. However when I tested the mic I wasnt able to get any sound aside from interference (I could hear a radio station, which from my understanding means that the audio was successfully being converted to digital?) However I was unable to pick up any noise from the capsule.

The main differences between my circuit and the official as far as I can tell is that I'm using a J111, a breadboard, and my resistor values are slightly different (I originally had more resistors in series to add up to the original number but took them out to troubleshoot). I used to have a mesh surrounding the system to block interference but I took it down when I wasnt getting any audio. The below diagram is a recreation of my breadboard. I forgot the two 100 ohm resistors in the diagram though but thats the only error I can spot so far. 

I tested bypassing the audio capture card and hooked some leads to an aux cable and was able to get more sound and a burst of audio when blowing hard on the capsule, however it was all static and not consistent and I was unable to get any sound after ~3 seconds. I have 2 THAT1512s and I have tried both with similar results. Does anyone know how to troubleshoot this so I can get usable sound? Thanks in advance. 🙂

IMG 3347
circuit(2)
 
Posted : 07/09/2022 4:18 am
JustAlbin
(@justalbin)
Posts: 2
New Member
 

@graydon-t

@tekken

I manage to build the mic and it works perfectly, 3 and 4 were reversed on my build though so I assumed there was an error and followed the wiring diagram. 

 
Posted : 17/09/2022 6:22 am
BIO.S
(@bio-s)
Posts: 3
New Member
 

Hello,
basically never done PCBs or electronics before, I was wondering why the 22uf non-polarised capacitors connected to the THAT 1512 V+ (to drain) and V- (to source) and Audio output do?
Are they for decoupling? 
Also, should I connect the Mic capsule GND to the GND of the preamp?
(nvrmd just realized I read things wrong lol this question don't make sense)

This post was modified 1 week ago by BIO.S
This post was modified 2 days ago by BIO.S
 
Posted : 20/09/2022 1:32 am
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