u/Ores_One

Hi everyone!

I am a backend developer by trade, but recently I've picked up amateur radio as a hobby. I am designing a piece of hardware to handle communication between a radio and a phone for an APRS app.

What you see in the screenshots is the result of 1.5 weeks of learning PCB design in the evenings. In parallel with designing in EDA software, I built two working prototypes on protoboards (included in the photos) to verify the circuit. Now I am trying to route the final PCB, but since this is my very first design, I desperately need a technical review before I send it to manufacturing.

Here are my core design assumptions:

Brain: Ready-made ProMicro nRF52840 module.
Components: Strictly THT to make it beginner-friendly and easy to DIY.
Audio Input Filtering: Bandpass filtering tailored for AFSK (1200 Hz for Mark / 2200 Hz for Space) for signal decoding.
Power Input Protection: Reverse polarity protection, alternator whine filtering (for mobile/car use), and transient voltage spike protection.
Goal: To release this as an open-source / open-hardware project once the PCB layout is correct.

I am explicitly seeking a strict technical review to ensure I didn't mess up.

Specific questions for the reviewers:

Is my routing clean enough, or did I make amateur mistakes with trace widths, clearances, and angles?
Are there any obvious issues with component placement, signal separation, or ground planes?
Is the power filtering and protection layout robust enough for an automotive environment?
What could be improved to make it even easier for beginners to solder?

Attached are the schematic and layout layers. Thank you in advance for your time and constructive criticism!

[PCB Review] First design ever - THT TNC for Ham Radio / APRS (ProMicro nRF52840). Seeking feedback before ordering!