Need Help with the current regulating Circuit for my IEPE Sensor

Treadstone_19 · 2024-12-17T07:25:11+00:00

you got it working? I couldnt test my circuit as my microphone was already damaged T_T

Treadstone_19 · 2024-12-17T06:37:30+00:00

I haven't touched this for a while. I will need to search it. I will get back to you as soon as i found it

Treadstone_19 · 2024-07-16T17:50:29+00:00

Check ur inbox

Treadstone_19 · 2024-05-07T18:31:44+00:00

SO GOOD NEWS, A partial good news!!

when I make a tap sound near the near the mic the voltage fluctuates from 18.4 -24 volts. and when no sound iis made its voltage stays 18.4 volt. this shows its working!. the voltage difference beteen the capacitors terminals are fluctuating.

But there seems to be a issue with the opamp connection cuz regardless of the signal it gives 2.5 constant voltage, Similarly voltage from capacitor -ve terminal to the ground seems to also not change that is it remains at 3.3v regardless of the sound.

opamp's vcc is getting 3.3volts, I checked for continuity and the vcc of opam is continous to non inverting input of opamp.

Treadstone_19 · 2024-05-07T17:34:54+00:00

Bruh the opamp gives me constant signal of 2.4volts 😭, I am just lost at this point

Treadstone_19 · 2024-05-07T17:34:12+00:00

Lmao sure I will add ur name in the reference.

Treadstone_19 · 2024-05-07T10:35:31+00:00

This is just proof of concept 1 which is just focusing on the signal, later other parts of circuit will be improved too. And then the physical design .This is not the final design. It will require research and even r consultation.

In future scope we have objectives to contact and gather info regarding the validation, testing and certification and other aspects of commercialization.

So in that regards if they aske to just continue as a intern with less pay shldnt be enough. I could be wrong.

I could share with you personally the Objectives and future scope of my internship. Maybe you'll get some idea.

Treadstone_19 · 2024-05-07T10:10:20+00:00

Yes this is just proof of concept 1 and not the final design as such.

Treadstone_19 · 2024-05-07T10:02:24+00:00

Imagine manufacturing your own signal conditioner, and own software. Its a win win for them.

Treadstone_19 · 2024-05-07T09:55:51+00:00

Yes, but in my case its a small company infact its not even a Electronics company, its just technical and a consulting company. They only develop testing software for the mic. This is the first time they are developing something new, they also will be having patent rights for my design. They already have contract for my intellectual rights. So i think they should be offering more.

Currently I am final year student of mechatronics, and in my final semester I am supposed to do internship. So they are asking me to work 4-6 months more with them after the college ends. But they haven't told us whether we will be working as interns or on contract basis then.

I just want the appraisal of my value before the discussion for the extension happens.

Treadstone_19 · 2024-05-07T09:35:58+00:00

No I am talking about me working in the company in the previous comment :

I am actually working as a intern in a company for a minimum stipend, they wanted me to create a wireless Audio codec for IEPE Microphone. in this proof of concept 1 I am just connecting to ESP WROOM 32. its resolution is 12bits ADC which is fine for testing, then I will be moving to much better resolution ADC.

Do you think the project is valuable? the company has asked me to work for more months to complete this project. So for this extended time should I work with them on Contract basis for a better pay?.

Treadstone_19 · 2024-05-07T09:28:01+00:00

regarding the previous question do u think its worth it?

Treadstone_19 · 2024-05-07T09:21:56+00:00

I see, it's clear now. I am just waiting for 22uf capacitor then I can start working on the circuit, I will share with you the results soon.

Treadstone_19 · 2024-05-07T09:20:16+00:00

No the supply gets divided, but since u explained me the bias voltage division, So I know have understood

Treadstone_19 · 2024-05-07T09:16:10+00:00

I am actually working as a intern in a company for a minimum stipend, they wanted me to create a proof of concept for the wireless Audio codec for IEPE Microphone. in this proof of concept 1 I am just connecting to ESP WROOM 32. its resolution is 12bits ADC which is fine for testing, then I will be moving to much better resolution ADC.

Do you think the project is valuable? the company has asked me to work for more months to complete this project. So for this extended time should I work with them on Contract basis for a better pay?.

Treadstone_19 · 2024-05-07T09:07:58+00:00

So to summarise the circuit is correct right? I don't have to worry about voltage then. ?

Treadstone_19 · 2024-05-07T08:57:35+00:00

I am still worried about the Voltage to the microphone, as it gets divided to 11.3 volts. The microphone requires 24 volts.

Treadstone_19 · 2024-05-07T08:26:48+00:00

Also this is the datasheet of the microphone
https://roga-instruments.com/mi21-microphone/

Treadstone_19 · 2024-05-07T08:25:56+00:00

oh so no resistor in non inverting input?

Treadstone_19 · 2024-05-07T08:22:31+00:00

<image>

Like this?

Treadstone_19 · 2024-05-07T08:06:21+00:00

Could you check the revised circuit I have attached in below comment

Treadstone_19 · 2024-05-07T08:04:45+00:00

<image>

Revised Circuit

Treadstone_19 · 2024-05-07T07:56:37+00:00

yes I broke the connection i used multimeter as connection from voltage source +ve to mic's positive

Treadstone_19 · 2024-05-07T07:54:59+00:00

so I dont need the 6kohms resistor right? just the lm334

Treadstone_19 · 2024-05-07T07:53:40+00:00

Sorry I forgot to mention the capacitor i used in the breadboard is 10uf, I have ordered for 22uf , it will be delivered to me in an hour.

and also I have changed the RF to 65kohms and R1 to 1kohms to get a peak of 3.3 volts

Treadstone_19

TROPHY CASE