Elektret mikrofon modul mikrprocesszorokhoz, audió projektekhez.
Állítható érzékenység, erősítéssel, MAX9814 IC-vel.
Ajánlott pl AVR, Arduino, PIC, stb. fejlesztésekhez, akár 3.3V vagy 5V logikához is.
Kézzel, vagy digitálisan jelre állítható érzékenység és A/R beállítás.
1. Supply Voltage: 2.7v-5.5v @ 3mA current
2. Output: 2Vpp on 1.25V bias
3. Frequency Response: 20Hz - 20 KHz
4. Automatic gain, selectable max from 40dB, 50dB or 60dB
5. Programmable Attack and Release Ratio
6. Low Input-Referred Noise Density of 30nV/7. Low THD: 0.04% (typ)
Use of the Electret Microphone
Amplifier MAX9814
The MAX 9814 is a microphone amplifier module with 3 settings options
of gain and 3 settings options of attack/release (AR pin).
for a gain between :
20db to 40 db, connect the gain pin to the VDD
30db to 50 db, connect the gain pin to the GND
40db to 60 db, leave the gain pin unconnected
for a A/R of :
1:500 ms/ms, connect the AR pin to the GND
1:2000 ms/ms, connect the AR pin to the VDD
1:4000 ms/ms, leave the AR pin unconnected
explanation :
when the signal is low, the MAX9814 will rise the gain of your signal (release), but when
you clap in front of the microphone it will detect a voltage peak in your signal and will
decrease the gain (attack).