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MAX4466 Electret Microphone Preamp Module Evaluation
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- Опубликовано: 5 авг 2018
- Testing the ability of the MAX4466 based electret mic preamp Arduino module to pick up and boost audio across the rated 20 Hz to 20 KHz audio range. Will it squawk?
Blooper List
- I am not plugging in the microphone output into the speaker amplifier input. I am plugging the sine wave signal generator into the amplifier input.
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i recently bought this module, just wanted to ask where should i connect the 100uF cap if i am using this module with NodeMCU microcontroller?
Could it be used for measuring speaker frequencies (20-20000 Hz) for crossover measurements??
Useful video
Could it be useful as a lavalier microphone in a phone? I mean, could it be a high quality microphone with low white noise? Good video.
Hi there, I have the MAX9814 module, but the gain is too high (default is 60db), i plug together the gain and the VCC and it gives me 40db, is much better but about 25db or 30db would be great. Do you have any idea in how to get a fixed 30db gain? Thanks in advance
Is it possible to use this amplifier with a ceramic/crystal microphone?
I have been trying just that, and I can't make it work.
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I'm thinking of using this mic on a LED fret board project on my guitar so that every time I strum the LEDs light up. My biggest problem is making the mic only sensitive enough to pick up my strumming and not really anything else. I'm also considering possibly taking the signal from my pickups and running it through the LED circuit instead but I believe it would be difficult to do without messing up the sound of the guitar output. Would you happen to have any advice?
condenser microphones like this pick up a lot of sound in the environment so trying to make them only focus on what they are placed beside would be difficult, that’s better suited to dynamic microphones like they use for radio or podcasting and they have to be always right near the speaking person to pick them up properly. I don’t know if there’s any small modules like this with dynamic microphones.
The better option would be buffering the guitar signal directly and having the presence of audio trigger something. If it is a circuit like an op amp it should have at least minimal impact on the sound like a buffered guitar pedal.
Wow 2 expansion board modules and a plastic sheet in 1 video!
Edit: that sine waves teared apart my ear membrane!
Do I need to use a microcontroller to make a audio meter with this ?
I am trying to make a simple led system which consist of ten leds and show the environmental noise.
Like ı need a microphone by calculating its voltage I want to construct a sysem wich light leds
If you do a search for the LM3915 Chip you should find lots of audio LED signal strength indicator projects.
@@GadgetReboot yes but i dont know sprcific reason tu use 3914 or 3915
ruclips.net/video/5tI8b_KqdrM/видео.html
That video shows some examples of three similar chips.
I plan to replace mic in my car radio for hands free calls. will it work? I mean 20Hz - 20kHz audio range is OK for calls or it has to be narrowed?
Without knowing how the rest of the system is designed or what it depends upon, like if this mic is replacing a different one that had extra on board filters or something, then if the rest of the system it plugs into was counting on that, it could lead to something like extra noise being picked up but the only way to know is to try. And the voltage used to power the module has to be within the operating range of the module's amp, so I don't know if it can go up to 12v or if it needs a separate 5v or 3.3v supply provided.
@@GadgetReboot 3.5 v is nor a problem. The system is Teyes CC3, chinese aftemarket radio. Excelent one with superior sound. Everything is perfect except of built in mic.
@@fevgg The other possible thing to consider is with this module being a mic plus preamp, the output is a ground referenced signal, so if it's plugged straight in where the other mic connected, and if that board also has a preamp, then there could be a lot of gain, and hopefully the old mic was ground referenced rather than some weird differential circuit. Would be good to check continuity from the mic pins to ground and see if it's that simple so the module ground can tie there and the signal out to the other mic pin.
In case of way too much mic gain between the module and radio, for a test hook up I'd add an extra potentiometer with one end on ground, other end on output of the module, wiper going to the radio and start with that way down so nothing screeches.
And I forget if this module has a series DC block capacitor on the output so maybe add another capacitor (maybe 0.1uF or something as a test) in series with the pot wiper - it may help protect from weird DC offsets coming from the radio back to the module and from the module to the radio if it's a weird circuit, so kind of acts like an isolator.
@@GadgetReboot thank you for your advise. I'll try
How much is the max gain ??
The design spec for this module says max gain is 125x
preamp can pick up 20+khz easily but that oldy speaker is probably failing at 10k with higher amplitudes
I was actually surprised it gave anything at all at 20 kHz. It’s so old that I don’t have any idea where I got it but maybe I can build a project for It and make it a nice home for its final days as an FM radio speaker for the bench or something.
btw - check out this FM module kit
www.aliexpress.com/item/Free-Shipping-FM-Transmitter-Module-Mini-Wireless-Microphone-Ham-Radio-Frequency-PCB-Board-91-103MHz-3V/32814123829.html
Maybe it could be helpful for such project
The speaker is probably bad at low freq and high freq. Probably worst at low.