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Clearer instructions (the learning experience)

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BIO.S
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basically here post on how you made your mic ig? (and how the preamp works on all resistors capacitors to chips and inputs/outputs if possible)
Might be helpful to others who looked the DIY perks video but couldn't understand everything cuz they are new or debugging what is wrong with their own mic.
(I'll post mine when I'm done tho I haven't researched the pre amp too much yet)
*after all there are some things we want to learn 🐒🧠

 
Posted : 27/09/2022 4:20 am
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Someguy
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So I found using this IKEA lamp:

https://www.ikea.com/ca/en/p/forsa-work-lamp-nickel-plated-60146764/

So I pulled off the lamp head, sadly I can't tell you how it'll go as I am still on the stage of getting the preamp done, stuck on the USB interface and USB C breakout board - posted about it on the main thread.

 

But the IKEA lamp should allow one to skip a massively expensive and hard step for the average person. The problem that may arise is that their isn't enough slack with rubber bands, or o-rings or anything. but can't comment on that.

 

I would love to see an update on your project. If you could help with the USB interface part that would be phenomenal too

 
Posted : 15/10/2022 1:11 am
BIO.S
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@someguy Yep I'm kinda stuck on it too, but right now I've basically got everything down except for shielding, mic connection, and the USB C breakout board. I also am designing a case that I will 3d print later, but lately, I have not had much time to work on the project because I have a lot of school and robotics stuff going on. I will try to update periodically starting maybe next week. but I'm not sure if I can keep up with it. Also, I AM BY NO MEANS A PROFESSIONAL (not in college even) so I will not know a lot of stuff too. 🍌

This post was modified 1 month ago by BIO.S
 
Posted : 22/10/2022 5:16 pm
Someguy
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@bio-s I think we are at the same spot, I have the same things left to do. Would love to continuously update each other.

 

Oh and figuring out how to do the connection for the rotary switch as well. I'll post some updates on the project today, to show you what I have so far

 
Posted : 22/10/2022 6:27 pm
BIO.S
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Mic transistor datasheet (2N4416/2N4416A/SST4416) - https://www.farnell.com/datasheets/39775.pdf

Mic capsule datasheet (JLI-2555BXZ3) - https://www.jlielectronics.com/content/JLI-2555BXZ3-GP.pdf

Potentiometer (instead of a bunch of resistors for Gain control, 1 - 500 ohms) - https://www.amzn.com/dp/B07DHG7WNJ

Copper wire for reducing cable vibrations (If you can't pick up small motors from local stores or don't have any) - https://www.amzn.com/dp/B0B519JBCY

Mic IC datasheet (THAT1512) - https://www.thatcorp.com/datashts/THAT_1510-1512_Datasheet.pdf

15v to 5v converter datasheet (NMA0515SC) - https://www.mouser.com/datasheet/2/281/1/kdc_nma-2941086.pdf

USB c Sub device breakout board - https://www.amzn.com/dp/B096M2HQLK/

This post was modified 1 month ago 4 times by BIO.S
 
Posted : 23/10/2022 3:49 am
BIO.S
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@someguy I have done the potentiometer already but idk if the audio chip only accepts a interval input (5,10,15,etc.), probably not cuz that would be very un-convenient to use.

WIN 20221022 23 14 13 Pro
This post was modified 1 month ago by BIO.S
 
Posted : 23/10/2022 6:10 am
Someguy
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@bio-s okay, so I got mine to turn on, but it was insanely quiet, with the shielding on the microphone, any ideas?

 
Posted : 25/10/2022 7:01 am
BIO.S
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Posted by: @someguy

So I found using this IKEA lamp:

https://www.ikea.com/ca/en/p/forsa-work-lamp-nickel-plated-60146764/

So I pulled off the lamp head, sadly I can't tell you how it'll go as I am still on the stage of getting the preamp done, stuck on the USB interface and USB C breakout board - posted about it on the main thread.

 

But the IKEA lamp should allow one to skip a massively expensive and hard step for the average person. The problem that may arise is that their isn't enough slack with rubber bands, or o-rings or anything. but can't comment on that.

 

I would love to see an update on your project. If you could help with the USB interface part that would be phenomenal too

The microphone is a sub-device if I'm not wrong. I found a USB c breakout board that is a sub-device here: https://www.amzn.com/dp/B096M2HQLK/

This post was modified 1 month ago 2 times by BIO.S
 
Posted : 31/10/2022 2:04 am
BIO.S
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Posted by: @someguy

@bio-s okay, so I got mine to turn on, but it was insanely quiet, with the shielding on the microphone, any ideas?

I did some looking around and I found this ( https://www.quora.com/Why-is-my-SM57-so-quiet) make sure your wires are fully connected and not loose.

Check if your ground cable is touching any other wire on the output so it might be a problem with the audio out (to the A-D converter).

The audio out cable has 3 wires red = right channel, white = left channel, and black = gnd. Idk if you need to combine the red and white wire to have an equal output but if you do I think it will make it a bit louder?

Also, I think you have to ground the mesh cage too ( https://electronics.stackexchange.com/questions/145718/do-electret-microphones-have-polarity search for "case" on this page), but also check the noise cancellation is not picking up input (try the mic outside or not speaking against a wall Idk if it will actually help lol)

Another thing is to just turn your gain up but you've probably thought of that already.

^thats what I think anyway

Also if you did, what desoldering wire did you use to make a copper cover for the thin copper wires? I don't know how to open the wires they all seem braided but not squashed.

This post was modified 1 month ago 9 times by BIO.S
 
Posted : 31/10/2022 2:08 am
Someguy
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That is phenomenal! So I took a look at the wiring and it seems fine, I typically use electrical tape around each wire to ensure they don’t short each other.

 

here are images:

B27A05BB 2B61 4E6A 8F81 CC053073E7C8
D881AA83 66EC 4345 B785 392524153338

Now something that is important to note is that I am using the J111 transistor on the capsule - I have ordered the recommended transistor to test if that is actually the issue.

 

for the case grounding does that mean I need the capsule grounding wire to be attached to the copper mesh I’m using for the case or does that mean I need the  edges of the circuit board to be touching the copper mesh inside the case?

 
Posted : 31/10/2022 7:04 am
BIO.S
(@bio-s)
Posts: 10
Active Member
Topic starter
 
Posted by: @someguy

That is phenomenal! So I took a look at the wiring and it seems fine, I typically use electrical tape around each wire to ensure they don’t short each other.

 

here are images:

B27A05BB 2B61 4E6A 8F81 CC053073E7C8
D881AA83 66EC 4345 B785 392524153338

Now something that is important to note is that I am using the J111 transistor on the capsule - I have ordered the recommended transistor to test if that is actually the issue.

 

for the case grounding does that mean I need the capsule grounding wire to be attached to the copper mesh I’m using for the case or does that mean I need the  edges of the circuit board to be touching the copper mesh inside the case?

Not for the pre-amp but for the mesh around the capsule I think so. 

Also if your mic is not picking up static noise it should be perfectly fine and maybe its just the problem of the transistor
( https://electronics.stackexchange.com/questions/535350/how-to-shield-your-microphone-the-best-way)

This post was modified 4 weeks ago 4 times by BIO.S
This post was modified 3 weeks ago by BIO.S
 
Posted : 01/11/2022 6:57 pm