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Desktop microphone for sbitx #sBITX_v3 #microphone #sbitx_v2

 

Desktop microphone for sbitx
For a long time I only used the well-functioning modes with the sbitx device.
I have established more than 10 thousand connections in digital modes, while I have conducted several tests in the voice mode using a microphone.
The microphone I modified uses an external AGC amplifier and has a higher gain than the microphones recommended so far.
I modified the so-called 'Meeting MIC' because there is enough space in its base for this modification.
According to the description, the electret microphone has a sensitivity of -40dB, the AGC amplifier has a gain of 40dB in my settings.
My experiences are good, because the stations that responded say it has a clear sound.
I detail the description of the modification in the attached pdf.
I hope that the retrofitters will have similar experiences.
A little assembly experience is required for the modification.
In sbitx 64 bit v4.4, I use MIC 25, COMP 4.
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Gyula HA3HZ
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Meeting MIC modification for sBitx use.pdf
Meeting MIC modification for sBitx use.pdf

 

Good work! ? Thanks for writing it up! ?

I suggest putting it on the wiki page as well
?
Gordon kx4z?
 

--
Gyula HA3HZ

Meeting MIC modification for sBitx_r1.pdf
Meeting MIC modification for sBitx_r1.pdf

 

Can you provide a Brand Name or Amazon / Ali express link to the Mic you used?
 

On Tue, Apr 22, 2025 at 06:41 PM, Jim wrote:
Can you provide a Brand Name or Amazon / Ali express link to the Mic you used?
Yes, I noticed late in the first pdf that this link was broken. Look for the same in the _r1 pdf in msg ?
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Gyula HA3HZ
 

ps.: ?I see that it is a consumable item, but a larger quantity is available at .
?
If you have sbitx, then you got a microphone. I think this AGC Mic amplifier can be built into it too.
I set the gain to 40dB and it works fine with the sbitx MIC in the 25 position.
The PTT switch is built in, you only need the amplifier module and a 1uF capacitor for MIC isolation and you need to find a Li-Poly battery that gives 3.7V and fits in the microphone housing. According to the description, the module operates with a power supply of 2.7-5.5 V. It is advisable to turn the power supply on/off.
This is just an idea, I did not implement it.
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Gyula HA3HZ

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