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Connecting Chinese Weishi microphone to computer


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If you use my newer version of tg, you can use the spectrogram function to see if there is a specific noise that is causing a problem.  Then it might be possible to use an audio filter to eliminate it or at least discover its source.  It's quite possible for the microphone to pick up noise you can't hear, or for something like a USB device to create electrical noise that shows up in the audio signal.

I recently added a BS.1770 style true peak meter to help adjust gain.  That's not released yet.

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had the right mix of gumption and boredom. 

I'm sure there are different board revisions, but on mine the test point "A" is directly connected to the audio signal from the mic input. 

It has a DC bias of 4v, so i installed an HPF of a 10uf cap and a 10k resistor. In retrospect, this cap could have been 1uf or even 0.1uf and we'd be fine. 

Used one of the numerous ground stitching vias on the board for the other end of the circuit. Threw on some ferrite beads because they were within arms reach. 

Ironically it turns out that the front panel mic jack on this computer may not be connected. I recently upgraded the motherboard. oops? 

It has enough oomph to power an earbud. line-in type inputs should work too. fwiw, when listening to it with earbuds, I heard some 120hz or so power supply noise. this is with no other electronics connected. Perhaps it just has noisy power and they just filter it out either before or during signal processing? 

Some time later i will maybe dig up the right adapters to plug it into my e-mu 1616m and see if that will work with tg. Or run a wire to the line-in for the motherboard sound on the back of the pc, I dunno. 

Possible other option would be installing an audio coupling transformer to prevent ground loops when connected to the computer. Would replace the resistor possibly. I'll have to see what i have in the parts bins. 

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Edited by TimpanogosSlim
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I did eventually find the right combination of adapters to connect to my e-mu system but then i couldn't recall how to map the asio channels to wdm channels and didn't want to look it up, so i connected to the rear panel line-in which works fine.  I'd attach a recording made in audacity but those aren't accepted here. So here's a screen shot. 

The buzz I was hearing through the earbud may have been LED lights or it may have been due to overloading the preamp with such a low impedance. I hear no such power supply noise when it is connected (correctly) to other input devices. 

TG is working just fine connected to the Weishi 1000 this way

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