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Yes I hold button until it goes into slow flash mode as per Teensy site suggestion. Tnx for help, I am busy winding coils so it is not an issue at moment. RX is fine without audio hat installed. Tried

On thing Tim… Have you been resetting the flash memory every time you load a program? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal

Very strange Tim… but we will help you figure it out! Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois

I2C scanner found all the addresses However program(ver50.2)will not run with audio hat installed :( Tim

And…. If it works only sometimes, there is a bad connection somewhere. Probably either a solder connection of one of the IDC cables. Pictures are worth 1,000 words! Dr. William J. Schmidt - K9HZ

Use this test software: T41/T41_V012_Files/T41_V012_Software/T41_V12_Software_For_Board_Testing/V12_Main_Board_Test/i2cscan at main · DRWJSCHMIDT/T41

You can actually do either, but it will be far easier to stack them one on top of the next. That's why it's written that way in the Assembly manual. BUT if you can get them side-by-side. that works

Dr. Bill Which I2C scanner SW do you use? Unrelated to audio hat, sometimes when I boot up it does not see LPF or BPF address All the others are seen. after some fiddling it will work fine. I check

I was under the impression that if there is enough room, you are better to stack them side by side? (Something about electrickery(sic) flowing the same length through the "stacked" components, albeit

Thanks

I used those listed in the BOM: https://github.com/DRWJSCHMIDT/T41/blob/main/T41_V012_Files/T41_V012_BOMs/T41_BPF_Board_BOM_V12.6_02-16-25.pdf

Hi Oliver, What capacitor values did you use to go with these inductor values? Did you use D.Solt's values or Bill's John, G0SDF

You have a pretty good method for winding the coils and I don’t want to overlook that… I sometimes forget I am an insider and don’t always think all the angles… too close to the trees. Dr.

I was just offering to help, if you wanted me to. But, you're right, it would be better for someone with a solid electronics background to do it.

You can do the part that is familiar to you, yes. But I do sell it as a generic kit for other QRP radios too… and it has a lot of additional functionality above what we use for the T41. I’ll have

First things first. If you load the I2C scanner software, does the audio hat respond at address 0x0A on WIRE like it should…? If not, concentrate your resoldering efforts around Pins 18 and 19…

Do you want me to do it?

You're right, I forgot! Jack, W8TEE

V12 Boards Ver 50.2 SW All is working no freeze up or glitches since installing ferrite sleeves on ribbon cable. However if I install the audio hat it never finishes boot up before program stops with

Not its time to do it for the LPF too… and a section on winding that line section transformer and how to make the Power and SWR measurement work. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ