Here's my advice to future me:
Whatever you making style is, Stick To It!
I've seen lot of amateur radio blogs with just gorgeous build, and I envy and admire them. I can't be them though.
I just spent my 'making' time for two days trying to 'improve' the aduio performance of Project TouCans. I tried all of the things. I made the lines shorter. I soldered the connections instead of suing screw terminals. I twisted the signal and the ground line together.
The audio only got worse and worse and worse!
Finally, I deided to move back o ththe previous iteration. Except! I'd tried so many different combinations, I couldn't remember the previous successful audio circuit laayout. No problem, I take ferquent pictures of the rig. I looked back. And? And!? Oh shit! The audio ground line was outside the can!And!? It wasn't just tied to the USB-C power adapter—that didn't work, it was far too noisy. No, the successful audio ground path was tied to the keyer relay ground. At that point, the ground from the rig had already traveled through a normally closed circuit relay that's used to interrupt power to the rig for resets. That made the whole contraption happy.
Another note: The keyer control wire likes to be taped to the relay bank near the circuit bank's board, (away from the can), as it rounds the corner to make it's connection at the bottom of the relay, (towards the bottom of the battery pack can.
Here's a look at and a listen to TouCans return to its exterior audio wiring setup.
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