![]() ![]() What sort of Mics are they? Electret or Dynamic. ![]() To sort the problem more information would be essential. I suspect your noise is not generated by the chip but by the power supply arrangement or poor signal screening I have used it as a heaphone driver and it works fine. The original board in your post should not cause significant noise. Maybe you would like to find some examples with specs ? Since none of the modules you link to have any specs, it's hard to choose one that's better for you. The Noyito board uses the dual version of this chip, the NE5532, but includes an electret microphone capsule on it.īe aware that an electret mike has some self-noise that's not thermal in origin as it includes a JFET buffer. The ubiquitous NE5534 would be perfect in non-inverting configuration which is quieter than inverting mode. In truth, many op-amps will do well for your mic amp. Of those examples you list, one is based on an SSM2167 chip which approaches the performance of the designs mentioned above, but no information is given as to the specifications. A headset mike also doesn't need a balanced input. Their typical low input impedance (~2kohms) may not ideally suit an inexpensive unbalanced electret condensor mike. They are somewhat specialised designs using discrete transistor differential front ends with voltage noise below 1nV/sqrt(Hz). Really low noise microphone amplifiers such as those in studio sound mixing consoles are designed for use with professional balanced low-impedance (usually 150-200 ohm) microphones. That'll exclude the popular LM4558 and LM741 for example. by electrostatic screening around your amplifier, and/or improving your power supply.įor the application you have in mind, almost any reasonably low noise amplifier chip typically with voltage noise below ~ 5nV/sqrt(Hz) should do fine. If it's something else, buzzing, hum, etc you need to find the cause and eliminate that instead, e.g. The above all assumes the "noise" is simple white noise. But there's no need to go to such lengths with the electret capsule fitted to your headphones. It's the best of the bunch for your application, assuming the rest of the board is up to scratch, and you can afford to power it (at least +/-5V, +/-12V better).Īs mic amps go it's still pretty noisy I've used the 5534 preceded by a discrete transistor stage to get input referred noise well below 1 nV/sqrt(Hz), when dealing with studio condenser mics. The third doesn't say, but the photo shows a NE5532, which is 5 nV/rtHz, and has been a staple of pro audio since the 1980s (along with its slightly quieter single channel brother, NE5534, as Graham recommends). Nevertheless its input noise voltage is just 10 nV/sqrt(Hz). It does work happily off just 3V.Īnother uses the AD828 (I note in passing that SSM was bought by AD) which is billed as a VIDEO opamp, with a bandwidth up to 90 MHz! A curious choice for a microphone. I guess it's adequate for some specific purpose, probably in a noisy environment since it includes a compressor. fairly noisy, considering SSM made their name as specialists in high quality audio. One of the boards has part number SSM2167 so we can easily find its datasheet : where reveals(!) voltage noise of 20nV/sqrt(Hz). You have not linked to any relevant datasheets. Or if you have in mind any other way to do that, could you please, let me know? Koobook SSM2167 - Microphone Preamplifier Board Preamp COMP Compression Module DC 3V-5VĬould you please, let me know if I can use them to achieve my goal? Noyito - 12V High-fidelity Microphone Pickup Module Noise Reduction Microphone Amplifier Board High Sensitivity KitĪcxico - AD828 - Stereo Dynamic Microphone Preamplifier Board Pickup Module DC 3.8V-15V MIC Preamp Module I got the following 3 pieces on Amazon because they claim they reduce the noise or something like that but I don't know if they are exactly what I'm looking for and how to configure them. (I have to say that I'm not an expert on this field) Then, I was thinking to build or configure some mic (pre)amplifier or something similar that let me achieve my goal. For example, when the room is in silent and even not talking, I can hear that noise. It actually works but there is some noise on the output signal that I can easily hear on the earphones of Headset B. Something similar to what I show you on the image below.įor that purpose, I bought the piece below, which I can place in between both (it requires some power) to achieve my goal. ![]() I want to be able to talk on the microphone of my Headset A and send that signal out to the earphones of my Headset B. ![]()
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