Hi Dean,
? Very very nice work! I have a Mikroe WM8732 board. The Mikroe schematic has the series R33 of 330 ohms and the coupling cap C23 as 1nF. ? But from the sbitx V2 schematics looks like sbitx does not use the WM8732¡¯s mic input but uses the RLINEIN pin as the mic input. The?WM8732¡¯s input and bias pins are not used.
Hope this helps.
Jerry KN6BJK
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On Feb 26, 2024, at 8:47 PM, Dean Souleles <
dsouleles@...> wrote:
Hi all....
Quick progress report. Happy to report my first phone contacts were made today. I only have a low pass filter for 40 m. so far so only one band.?
if you want to listen.
I built a mic today with one of the sensitive electret capsules that have been discussed in the other threads.? I put it in a 3D printed case using a micro switch for the PTT.? First contact reported distorted audio but then I realized I had the mic gain at 100... Back it off to 50 and then to 35 and started making contacts with good audio reports.
I still have a few kinks to work out. I'm not sure the codec board is functioning well. It seems to go into oscillation when using the built-in CW sender. And I get some crackling and noise in the side tone audio. I also still have an issue where the displayed frequency counter track with the tuned frequency.
Curious if anyone else is using the codec board from Mikroeelectronica?? I noticed that it has different values for the serious capacitor and termination resistors on the headphone audio-out channels then is used in the SBITX version.
Below is what the rig looks like as of today.
73,
Dean
<PXL_20240227_002544463.jpg>
