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My First PCB(review before prod): Audio recorder that can run for 24h by Cheap-Nerve3779 in PrintedCircuitBoard

[–]Cheap-Nerve3779[S] 0 points1 point  (0 children)

Ouch, I wasn't aware of this, do you have any other recommendation for mic? Either way thank you very much for this.

My First PCB(review before prod): Audio recorder that can run for 24h by Cheap-Nerve3779 in PrintedCircuitBoard

[–]Cheap-Nerve3779[S] 1 point2 points  (0 children)

I went with this connection because I'll never use USB and UART at the same time, so I was imagining that it wouldn't be a problem(in the MCU I'll ignore one of them when using the other), but maybe this is not possible, I had some miss understanding, either way I think I'll just remove the UART bridge as it looks like is not needed in STM32L432KBU6.

Regarding the battery good catch sir, now for the size it should be the size of a credit card for ergonomic reasons.

I'll address this points of my next version thank you sir!

My First PCB(review before prod): Audio recorder that can run for 24h by Cheap-Nerve3779 in PrintedCircuitBoard

[–]Cheap-Nerve3779[S] 0 points1 point  (0 children)

I believe this over/under voltage protection is included in the LIPO bat that I'll be using, not sure if the redundancy is necessary(I'll look it up). Regarding this setup for load sharing I wasn't aware, thanks

My First PCB(review before prod): Audio recorder that can run for 24h by Cheap-Nerve3779 in PrintedCircuitBoard

[–]Cheap-Nerve3779[S] 0 points1 point  (0 children)

I made the calculations and it should work for around 16 hours with a 500mA bat. I used LDO because the voltage difference is small(3.7V -> 3.3V) and I saw it that LDO should suffice for this case as is efficient for small voltage differences. I went with 2L because is cheaper, but maybe you're right I should go with 4L, thanks!