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Nick C.
Reviewed in the United States on March 6, 2025
Sounds great, works well. I modified the circuit to provide a high-pass "pre-emphasis" for use with an AM transmitter. Circuit below:
Treg Townsend
Reviewed in the United States on May 7, 2024
They worked for what I needed them for.
Jordan Pizza
Reviewed in the United States on May 24, 2024
The product overall is a very nice one - I wish the headers were pre-soldered, but that's not a dealbreaker. Dealing with Analog Signals, especially if you're utilizing something like CircuitPython is a bit more trouble than it's worth. You can grab I2S Microphones for a similar price and quantity for a much smoother experience.
kluj
Reviewed in the United States on November 12, 2024
Wanted a voice activation solution outside having to come up with a Java solution in Android, but didn't have enough resources on ESP32C3 to handle voice recognition well. Settled on a "whistle trigger" (using Goertzel constants; frequencies matching whistling on a b-flat scale triggers current on different I/O pins) instead. This worked out reasonably well, though I was foiled again by ceiling fans. Struggled to get consistent readings; eventually realized I had a ceiling fan pointed directly at the microphone; things were fine after turning off the fan.
Will M
Reviewed in the United States on September 11, 2023
Had no issues getting these to work for my project. Have bought others and they wouldn't work. I've used 3 so far and not one problem.
W
Reviewed in the United States on August 6, 2023
On an oscilloscope compared to other mic/amp test boards (both MAX4466 and MAX9814), the output of this one is significantly different. Rather than the signal bounce above and below 0, all output travelled mostly in the negative. This didn't work for my LM9515 light bar display project, which would never show more than 4 LEDs on a 10 LED test board regardless of amplifier gain or LM9515 ref voltage adjustment.
Rocket1812
Reviewed in the United States on October 3, 2023
The intent was to use these mic preamps with the mic in on my desktop computer powering it with the 5v USB. Didn't work. The 5v USB has way to much hash/noise and that destroyed the mic audio. Running the mic preamp from 3v battery pack, the mic preamp works as it should. Bottom line, these mic preamps need clean DC to work.
ctsims
Reviewed in the United States on July 20, 2022
Solid little microphone without too much markup over direct-from-china shipping. I used them for capturing audio signal levels and the sensitivity and calibration have been good on each of the ones I've tested, but I can't speak to their frequency response.
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