SBL#3 DIY microphone preamp for lower noise recording with onboard soundcard

In this video I have designed, build and test two mic preamp circuits. I also briefly describe the circuit diagram I have come up with. Comment below if you spot any possible improvements :-)

[@luqmanrashid1651]

Susah nak dapat video macam ni dpd malaysia..i love it!!

[@solderbridgelab4003]

Terima kasih atas sokongan ☺️

[@fixmyaim]

you are a legend keep up !

[@UpinkProduction]

I love it good
Keep uploading videos like this

[@solderbridgelab4003]

Thanks a lot for supporting! ☺️

[@abcdefgh99697]

I love you my guy
You're the best

[@sail4life]

Very nice!

[@zindaginamilegidobara3372]

Sir... this video is really interesting.... sir may know which spice software you have used for the circuit simulation?

[@solderbridgelab4003]

Hi, thanks a lot for the interest! I used NI Multisim 10. *EhemmCrackedEhemm*

[@daffa9505]

Mantap sekali bapak terima kasih banyak!!

[@ImnotChuck.]

I don't understand the purpose of the four 1n4148 diodes. Please explain. Thank you.

[@solderbridgelab4003]

Hi, thanks for your interest! The four diodes are rudimentary output voltage clamp protection. They limits output voltage swing to about +-1.2V peak to peak. Should be plenty for microphone input of recording device.

[@rosangpongener6075]

Can i use piezo pickup??

[@solderbridgelab4003]

Hi! Thanks for your interest ☺️ I am not familiar with piezo pickup, but it may have quite small signal with high impedance, you can try the dynamic mic circuit. But wouldn't surprise if some tweak needed.

[@seyhmusbeken4702]

Hello, I want to prevent the noise of a CNC machine. Will this circuit work? Please help.

[@seyhmusbeken4702]

I want to know if you can help me with this

[@solderbridgelab4003]

Hi, good day to you! What kind of noise? Need more description. Is it high pitch noise when the motors are idling?

[@seyhmusbeken4702]

yes , sir it has @@solderbridgelab4003

[@seyhmusbeken4702]

I want a 5-axis CNC machine to run quietly, so I'm trying to build a circuit with an opamp, like yours, to prevent noise by sending a signal opposite to the frequency it receives.
@@solderbridgelab4003

[@saheburrahman1213]

What type of capacitor you use for c1,c2,c6 and c7 ?

[@solderbridgelab4003]

Hi, I assume for electret mic circuit. For C1 and C2, best to use non-polarized caps at higher capacity for better low freq response. For example MLCC or even electrolytic cap ( there are non polarized ones). C6 and C7 are supply bypass caps so MLCC should suffice. Thanks for the interest 😄

[@saheburrahman1213]

@@solderbridgelab4003 thank you so much for your reply🥰