By connecting a 10 ♟ capacitor to those pins, the gain value increased to 200. Since the voltage variations of the coil corresponding to the voice was very low, we figured out that we needed a higher gain. It naturally provides a gain of 20, but the gain value can be modified by connecting components to the gain pins (1 & 8) of the chip. The amplification block consists of a Texas Instruments LM386 op-amp. As a result, you might want to play around with the values of the filter depending on the application you would like to use the microphone. So this makes the our microphone efficient for phone calls or anything that requires only human voices. The range that is not filtered out (0 Hz-7958 Hz) contains human voice frequency range (300 to 3000 Hz). Hence the cutoff frequency is around 7958 Hz. The resistor value R1 is 220 Ohms and the capacitor value C1 is 100 nF. In order to filter out the high-frequency noise that made the interesting signal hard to discern from the noise itself, we added an RC filter as a low-pass filter which cutoff frequency is quite low regarding the dynamic range of the human ear (20Hz-20 kHz). It provides a flexible membrane that moves a coil around a magnet to generate a voltage. The mechanical sensor of the microphone is simply made of an earphone. 1 x male jack plug, which you can propably get from the speaker you used.2 x Capacitors 10 μF and 100 nF respectively.2 x Resistors 330 Ohm and 220 Ohm respectively.To build the microphone system you will need: The output of the system ends with a male jack plug so that it can be used to get sound in any piece of hardware that has an audio input jack port (computer, etc.). The pre-amp block made of an op-amp and an adjustable resistor.The analog noise filtering block which consists of a low-pass filter.The sensor block which is basically the old earphone speaker. Our system is organized within four blocks: Since there is only one sensor, the microphone audio has only one channel (mono). You also can review shipping details within an item’s “Shop Policies” section.Our specifications where to build a sensor that acts as a microphone that can sense, relatively accurately, the full frequency spectrum of the human voice (300 to 3000 Hz) and can be plugged into a PC or other recording device. To exclusively browse for microphone preamps near you, reference the list of top cities and countries available on Reverb to search within a desired location. For those with an expansive setup in mind, looking into multi-channel units is worth your while.
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