How To Make BOYA BY-M1 Microphone Battery Free | Don't Buy LR44 Battery Anymore.
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- Опубліковано 26 вер 2024
- This video is about how to make your lav mic (Boya by m1 ) battery-free.
it's a life-saver technique for all the users of boya by m1 microphone who are struggling with LR44 battery replacement and the microphone output level shift issues due to the battery drain.
this video contains a bit of in-depth knowledge about it and is formatted like a power pack with more info in less time.
Little More About Condenser Capsule
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A condenser electret capsule is like a parallel plate capacitor.
one of its plates is the diaphragm and the other one is a fixed plate.
The equation of capacitance is C = ε0(A/d)
Where
C = capacitance, A = area of the plates, ε0= dielectric constant, d= distance between the plates.
Here the diaphragm is a movable plate so it vibrates according to the sound pressure.
This means the distance between the plate varies and is directly proportional to the applied sound pressure.
As a result, according to the capacitance equation, the capacitance will change according to the applied sound pressure.
The voltage across the capacitor is given by V=QxC
Where V = volts, Q = charge in coulombs, and C= capacitance
Here the capacitance is varying according to the sound pressure
As a result, according to the equation V=QxC, the voltage will vary according to the change in capacitance
This change in voltage is amplified by the FET inside the capsule and the audio signal appears at the output after the dc blocking capacitor.
which is used to eliminate the dc components from the signal.
Thank you.
Regards.
MADEbyAneeshmurali.
Hello my friend. I figured out same technics as you, but when I connect this mic to my external audio interface Scarlett 4i4 I have very very very low signal without battery. Even if phantom power is on. Can you advice whats wrong and how to make it operate without battery?
I believe it's a bias voltage issue. Check the voltage coming from the jack without wiring the microphone. We need between 1.5V to 2.5V (1.5V is typical for this capsule). If it's below 1.5V, it's under-biased and proportionally decreases the output signal.
If it is too high cause degradation in sound and may damage the capsule.
After I got the microphone, I mistakenly inserted the LR44 battery with reverse polarity inside the capsule and turned on the switch. Obviously, it didn't work, so after realizing my mistake, I corrected it by installing the battery with the correct polarity. It works, but there is a constant static noise in the recordings. Do you think I might have somehow damaged the circuitry inside the capsule?
Static noise are common in every microphone and it's there. When it's getting too loud then there is a problem maybe somewhere in the cabling or connector based issues. You can use audacity to clean up the audio or use ai based tools like rtx voice or atleast you can turn on noise reduction in the audio control panel of your personal computer.
Check out my mic building video there I explained some of the audio recording tips and I made that mic for just around $1.77 and which sounds great with my recording tips.
tq bro 💛
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