Hello, thanks for the video. I tried to reproduce the experiment but was unsuccessful. I can not hear anything. In your video it doesn't show where you connected the output, so I have a doubt if you connected your output to the amplifier and from the amplifier to the speaker, or if you connected the output of the max4466 directly to the speaker and what the speaker's Ohms would be, please ?
I connected to an amplifier. --> Connecting direct to a speaker will NOT yield any results. I'm not sure of the speakers' ohms. Let me know if that answers the question. Oh BTW - Ensure you use a 4.7Million ohm resistor in lieu of a 1million, as it gets much better feedback suppression as you up the volume. Cheers.
Turning the pot on the back of the board clockwise should lower the gain, but I guess turning it too much might push the gain to it's maximum at some point
@@alirezaghassemi4123 thank you so much!!! I actually thought of that, but i was afraid to try it! Haven't tested the results yet, but i promised I'll tell you here!
Worked like a charm! Again, thank you! It really is clockwise and there's a min-max rotation, so you reach a minimum gain by turning the pot clockwise (no overflow)
@guizeh7 @alirezaghassemi4123 Thanks to both of you for the info. While I was aware the potentiometer controlled the gain, I had not considered that there may be any benefit to keeping it low. @guizeh7 - I’m curious, what your use case was that necessitated the lowest gain? Was it related to feedback…or something else? Cheers
The little electret microphone on the preamp board needs power to work. The board supplys the power needed. Your example of plugging in a mic of this type and not working is usually because there is no power to the mic. There is lots of information on the net on how to power electret microphones.
Ahh, it appears i may not have conveyed my intended message as clearly as I could have - what I was referring to was if you use a mic without a preamp (instead of this setup) you’ll get no audible output. Although I do see that me pointing at the mic when referencing that issue could be interpreted as referring to the max4466 in lieu of a conceptual mic without a preamp to which I was referring. I’ll try to mitigate such potential for confusion in the future. Thus, Regarding powering the mics, I’ve never had issues with that in the max4466, given it uses the same power as the preamp. Hope that clarifies. Thanks for the feedback. Cheers
I have an IP camera with a two pin electret on the board. The sound it records is too less. I was planning to remove that mic and use this module instead. I would connect the ground of the module to where -ve of the camera electret was qnd out to +ve. Vcc would be connected to 5v (+)microusb input via a jumper. My question is, do i need to connect the ground of the modile to microusb (-) via a jumper as well? I ask since ground of module is already connected to the point on camera board where -ve of the original electret was connected. (All this assuming the amplification circuit on camera chip doesn't interfere with the amplified signal of the module)
It seems your issue is not the PreAmp, but instead you just need an amp on your audio output. Just keep in mind that if your device has a mic built in it will also have the preamp capability- which only amplifies it to mic level which is not audible to the ear by itself - it requires an amp to amplify mic level to something you can hear. Thus I’d recommend putting an amp on your audio out. If the recording capability is all on the same board then perhaps your amp needs to be integrated in the middle which would be odd. If your IP Cam onboard preamp is burnt out perhaps putting in this preamp module in place of your mic may work; but if you have an onboard amp that’s burnt out - updating your preamp will not likely make much of a difference (my main concern would be that if either preamp or amp are burnt out it may have affected your audio path which may not be fixable. ) Regardless, I don’t really understand your explanation of the circuitry so I cannot make any recommendation on that. I would just say to test things quickly to decrease the possibility of burning anything out. For the preamp or amp - You can try linking to the same power source, but it may cause noise on your audio output. You’d then need either a noise filter or a separate power source. You MIGHT be ok since the IP cam also includes audio…but whenever I try to connect audio device to something powering a fan for instance- the fan pushes noise to my audio- so I use separate power sources.
@@creative-stuff The camera does not have a dedicated audio out functionality, it basically records the audio-video on an SD card which can later be watched/listened to. The mic on the camera fails to pickup low volume sounds clearly, hence I was wondering if removing the electret on the camera chip and replacing it with this preamp module-mic combo would make a difference. But ofcourse maybe this isn't how any of this works at all and I'm misunderstanding the concept of how preamps work. Before experimenting with this route I will simply try replacing the (very) small stock electret mic in my camera with a bigger 9X7mm mic and see if it works to better record the audio. Also It could be that the noise you experience when sharing an audio power source with a fan could be due to interference from EM fields generated by the fan motor. They might be inducing tiny stray currents in the wires, enough to interfere with the mic
Good point on the interference- that is always part of the challenge with things like this if you weren’t the one who built the board you don’t know if it’s a problem of interference, noise or if it’s even a programming that ignores audio below a certain level assuming it’s noise. Thus, if you swap the mic, it might still have the same problem because it’s still hearing it but it’s just zeroing it out because it’s thinking it’s noise. But one can’t say for sure given a different mic might give it just enough extra decibels to breach the noise floor and for it to be processed through. So essentially if you’ve got a mic as part of it already, it’s got a preamp on there somewhere however, you bring up a good point, in the sense of adding more volume to the internal signal, especially if you’ve got software, that is actually intentionally ignoring audio below a certain level - then a preamp might amplify lower level signals up enough to breach the noise floor and be processed. Thus it might be an interesting idea to try a pre-before the preamp. Hmm. I’m not quite sure how it will work out for sure, but if nothing else is working for you, it might be worth a try and those preamps are so inexpensive anyway. Thanks for the more detailed description that really helped out. I’m interested to know how this is working out for you since it’s been three weeks if you were able to find success with that larger mic or if you’re still going to try out a preamp behind your mic. Cheers
If you wanted to, yes. However your pc doesn’t need a preamp’d signal. If you need a mic with preamp for other reasons that can also work on your PC I recommend this instead, as it gives a cleaner output that’s less prone to feedback & it’s prebuilt (no soldering) - LV1 with 3.5mm splitter and 1/4” converter amzn.to/4epX5dF LV1 with usb converter amzn.to/3TwXBOW
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Hello, thanks for the video. I tried to reproduce the experiment but was unsuccessful. I can not hear anything. In your video it doesn't show where you connected the output, so I have a doubt if you connected your output to the amplifier and from the amplifier to the speaker, or if you connected the output of the max4466 directly to the speaker and what the speaker's Ohms would be, please ?
I connected to an amplifier. --> Connecting direct to a speaker will NOT yield any results.
I'm not sure of the speakers' ohms. Let me know if that answers the question.
Oh BTW - Ensure you use a 4.7Million ohm resistor in lieu of a 1million, as it gets much better feedback suppression as you up the volume.
Cheers.
@creative-stuff Thank you very much! I was successful and yes, we have to connect it to an amplifier.
@@alissonmartins1800 Excellent - great to hear!
Take the black spacer off and you will be able to plug the battery plug in more securely.
Right you are @chronobot2001! I’d just soldered that piece in and hadn’t even thought of removing it before testing things out.
maybe you can go over gain or sensitivity adjustment
Request noted. It’s added to my backlog. Cheers
Hi! tnx for reviewing it...I'm just not sure how to use the built in gain control. I have to lower it a bunch for my use...
Can you help me?
Turning the pot on the back of the board clockwise should lower the gain, but I guess turning it too much might push the gain to it's maximum at some point
@@alirezaghassemi4123 thank you so much!!! I actually thought of that, but i was afraid to try it! Haven't tested the results yet, but i promised I'll tell you here!
Worked like a charm! Again, thank you! It really is clockwise and there's a min-max rotation, so you reach a minimum gain by turning the pot clockwise (no overflow)
@@guinogueira7 Glad to be of help. Thank you for the update on overflow.🙏
@guizeh7 @alirezaghassemi4123 Thanks to both of you for the info. While I was aware the potentiometer controlled the gain, I had not considered that there may be any benefit to keeping it low.
@guizeh7 - I’m curious, what your use case was that necessitated the lowest gain? Was it related to feedback…or something else?
Cheers
The little electret microphone on the preamp board needs power to work. The board supplys the power needed. Your example of plugging in a mic of this type and not working is usually because there is no power to the mic. There is lots of information on the net on how to power electret microphones.
Ahh, it appears i may not have conveyed my intended message as clearly as I could have - what I was referring to was if you use a mic without a preamp (instead of this setup) you’ll get no audible output. Although I do see that me pointing at the mic when referencing that issue could be interpreted as referring to the max4466 in lieu of a conceptual mic without a preamp to which I was referring.
I’ll try to mitigate such potential for confusion in the future.
Thus, Regarding powering the mics, I’ve never had issues with that in the max4466, given it uses the same power as the preamp.
Hope that clarifies.
Thanks for the feedback.
Cheers
I have an IP camera with a two pin electret on the board. The sound it records is too less.
I was planning to remove that mic and use this module instead. I would connect the ground of the module to where -ve of the camera electret was qnd out to +ve. Vcc would be connected to 5v (+)microusb input via a jumper.
My question is, do i need to connect the ground of the modile to microusb (-) via a jumper as well? I ask since ground of module is already connected to the point on camera board where -ve of the original electret was connected.
(All this assuming the amplification circuit on camera chip doesn't interfere with the amplified signal of the module)
It seems your issue is not the PreAmp, but instead you just need an amp on your audio output.
Just keep in mind that if your device has a mic built in it will also have the preamp capability- which only amplifies it to mic level which is not audible to the ear by itself - it requires an amp to amplify mic level to something you can hear.
Thus I’d recommend putting an amp on your audio out.
If the recording capability is all on the same board then perhaps your amp needs to be integrated in the middle which would be odd. If your IP Cam onboard preamp is burnt out perhaps putting in this preamp module in place of your mic may work; but if you have an onboard amp that’s burnt out - updating your preamp will not likely make much of a difference (my main concern would be that if either preamp or amp are burnt out it may have affected your audio path which may not be fixable. )
Regardless, I don’t really understand your explanation of the circuitry so I cannot make any recommendation on that. I would just say to test things quickly to decrease the possibility of burning anything out.
For the preamp or amp - You can try linking to the same power source, but it may cause noise on your audio output. You’d then need either a noise filter or a separate power source.
You MIGHT be ok since the IP cam also includes audio…but whenever I try to connect audio device to something powering a fan for instance- the fan pushes noise to my audio- so I use separate power sources.
@@creative-stuff The camera does not have a dedicated audio out functionality, it basically records the audio-video on an SD card which can later be watched/listened to.
The mic on the camera fails to pickup low volume sounds clearly, hence I was wondering if removing the electret on the camera chip and replacing it with this preamp module-mic combo would make a difference. But ofcourse maybe this isn't how any of this works at all and I'm misunderstanding the concept of how preamps work.
Before experimenting with this route I will simply try replacing the (very) small stock electret mic in my camera with a bigger 9X7mm mic and see if it works to better record the audio.
Also It could be that the noise you experience when sharing an audio power source with a fan could be due to interference from EM fields generated by the fan motor. They might be inducing tiny stray currents in the wires, enough to interfere with the mic
Good point on the interference- that is always part of the challenge with things like this if you weren’t the one who built the board you don’t know if it’s a problem of interference, noise or if it’s even a programming that ignores audio below a certain level assuming it’s noise. Thus, if you swap the mic, it might still have the same problem because it’s still hearing it but it’s just zeroing it out because it’s thinking it’s noise. But one can’t say for sure given a different mic might give it just enough extra decibels to breach the noise floor and for it to be processed through.
So essentially if you’ve got a mic as part of it already, it’s got a preamp on there somewhere however, you bring up a good point, in the sense of adding more volume to the internal signal, especially if you’ve got software, that is actually intentionally ignoring audio below a certain level - then a preamp might amplify lower level signals up enough to breach the noise floor and be processed. Thus it might be an interesting idea to try a pre-before the preamp. Hmm. I’m not quite sure how it will work out for sure, but if nothing else is working for you, it might be worth a try and those preamps are so inexpensive anyway.
Thanks for the more detailed description that really helped out. I’m interested to know how this is working out for you since it’s been three weeks if you were able to find success with that larger mic or if you’re still going to try out a preamp behind your mic.
Cheers
Can use this as a pc mic?
If you wanted to, yes. However your pc doesn’t need a preamp’d signal.
If you need a mic with preamp for other reasons that can also work on your PC I recommend this instead, as it gives a cleaner output that’s less prone to feedback & it’s prebuilt (no soldering) -
LV1 with 3.5mm splitter and 1/4” converter amzn.to/4epX5dF
LV1 with usb converter amzn.to/3TwXBOW
20dollars that mice 2$ on AliExpress battery 3$ cables and connectors about 1$
toooooooooooooooooo long vdo budyyyyyyyyy