Improve USB Microphone Sound With Amplifier | PCB FROM PCBWAY.COM
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- čas přidán 2. 08. 2024
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Adding DIY preamplifier to USB microphone to improve sound quality and reduce noise.
SOUND TEST starts at 6:05. Do you notice difference between A and B? Which one is better? Are you using headphones, proper separate speakers or internal speakers (phone/TV/laptop)?
Noise was removed from both tracks and volume was normalized. No equalizer tuning was used for either track.
I've had this USB-microphone for few years, but haven't used it other than testing it couple of times. It was on clearance sale for just 10€, while similar microphone used to cost about 50-70€.
Because I didn't like the frequency response, the microphone was placed in a box of broken electronics waiting to be used in projects.
Recently I found the microphone again and decided to reverse engineer the microphone section of the circuit. Then I decided to replace that section with my own preamp that also has filtering for the power supply.
PROJECT SHARED AT PCBWAY.COM:
www.pcbway.com/project/sharep...
0:00 Requesting feedback
0:10 The microphone
0:49 PCBWAY.COM AD
1:27 Original circuit
2:25 My replacement circuit
2:32 Filtered power
3:10 Microphone +bias
4:21 Amplification
5:24 Output
5:38 Assembled circuit
6:06 COMPARISON
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I'm using medium quality headphones A was okay, B was maybe a bit better, but not sure why. It was more pleasant to listen.
Thanks for the feedback! I think the conclusion is they are both good, nothing inherently wrong about either of them. A is sharper, some say it has better clarity. B is smoother, softer...
A was the modified version, B was the original. A has more gain and makes recording easier, so I will keep using that.
Thanks again for commenting! Cheers!
B sounds better to me - your voice changed from previous videos. :)
A hasn't sounded bad, but it has some sort of tiny distortion compared to B. B also sounds better at higher frequencies and the S sounds are softer.
I'm listening through Aeropex Aftershokz.
Thanks for the feedback! The B was the original one. I can totally hear the sharp S sounds in A, now that you said it. But I think it isn't over emphasized, like in some cheap microphones. The modified mic has better sensitivity and I can place it more freely while recording. Usability of tools is often the main criteria and with so small difference in sound quality, I will keep the modified version.
Cheers!
I like A a bit more but that's probably because it sounds more familiar. B probably sounds objectively better both in low and high frequencies, I just don't like how plosives are now more pronounced. It's not a big difference trough. I've listened trough flat-tuned diy speakers and v-tuned blon bl-01 IEMs and the difference is slightly bigger trough the IEMs.
Thanks for the feedback! First vote for the A, which is the modified one. The difference isn't really significant in my opinion either. Sometimes I like the softer B, but sometimes I think A sounds more like my real voice.
I will keep the modified version. I like the extra sensitivity of the amplified mic.
B sounds like it has more bass than A but they are both perfectly acceptable. I am using cheap bluetooth headphones from Sony. I am not sure why they have that 100 pF cap across the capsule? Is it for RF? You might be able to get away without it but it should not affect anything below 480kHz. The original design might have needed it to prevent digital noise from bleeding into the tiny mic signal.
Thanks for feedback! A is the modified version. Difference in sound quality being so small, I will keep the modified version.
While testing and developing this circuit dead bug -style without PCB, there was quite a lot of noise, which got reduced with the 100p cap. It was most likely those long capsule leads picking up RF, which would also have been eliminated/dampened after putting the circuit inside the metal body. It may not be needed. I haven't compared the signal with and without the capacitor while the mic was assembled.
Do you hear difference between A and B? Which one is better?
can you make versoin for noobs please? I have pretty cheap microphone which sounds not bad, but it's silent. I always must to boost gain in every program which causes a lot of noise on recordings. Please help, it's maono au-a04
B is definitely less sharp and better , but if not put side by side you can never tell
Thanks for the feedback! A is the modified one. This seems to be the conclusion. But as the difference is quite small and I like the flexibility of higher gain the modification brings, I will keep using it. Cheers!
dont have my headphones here right now, but no surprise that laptop speakers cannot detect any difference
Thanks for feedback! Yeah, there isn't a huge difference. A is the modified version, which I will keep using. The extra gain gives me flexibility while recording.