Contents
How to calculate mic sensitivity?
Microphone sensitivity is calculated as the output level the mic will produce in a known sound field. RØDE and most other professional audio manufactures use a sound field level (or pressure) of 1 Pascal (or pa) = 1V, this equates to 94dB SPL.
How many decibels is a microphone?
The free-field sensitivity states the voltage a microphone generates when placed in a free sound field at a sound pressure of 1 Pascal (which is the same as a sound pressure level (SPL) of 94 dB).
What is Max SPL microphone?
The maximum SPL reading of a microphone is the maximum sound pressure the microphone can handle before it will distort or fail. Microphones should not be kept in SPL zones above their maximum rating as this may damage the capsule.
What is the AVOL of the max4466 electret amplifier?
High AVOL: 125dB (RL = 100kΩ). Purchase this product now and earn 3 Robu Points! MAX4466 Electret Microphone Amplifier with Adjustable Gain Module is fully assembled; tested board comes with a 20-20KHz electret microphone soldered on.
How to convert volts in dB SPL-electrical?
As stated in the top answer, voltage gain is calculated as 20*log10 (V1/Vref) where V1 is the Vrms of the measured voltage and Vref is the microphone sensitivity. Then, the microphone sensitive in dB is subtracted off (-46dBV/Pa) before being added to dB SPL standard (94 dB SPL), but this doesn’t quite make sense to me.
Which is bigger 46 DBV or 46 SPL?
-46dB V/Pa is how I read it and 1 Pa is the sound pressure in newtons per sq metre. 0dB SPL is 20 micro Pascal therefore, 1 Pa is 50,000 times bigger or, in dB it is 94 dB SPL. So, if you are measuring -46 dBV then you are measuring a SPL of 94 dB. -46 dBV is near enough 5 mV RMS so, again, if you measure 5mV RMS then the SPL is 94dB.
What should the gain be on an electret microphone?
On the back, we include a small trimmer pot to adjust the gain. You can set the gain from 25x to 125x. That’s down to be about 200mVpp (for normal speaking volume about 6″ away) which is good for attaching to something that expects ‘line level’ input without clipping, or up to about 1Vpp, ideal for reading from a microcontroller ADC.