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.