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u/ember_r

r/Preply r/PrintedCircuitBoard r/PCB
▲ 3 r/Preply

Tutors, how does a cancellation affect you?

I am going on an extended trip soon which is longer than 20 days and I won't have any internet whatsoever, so I need to cancel my subscription with my tutor. She is very kind and the last thing I want is to somehow affect her in a bad way, so I was wondering if cancelling is okay.

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u/ember_r — 16 hours ago
▲ 45 r/PrintedCircuitBoard+1 crossposts

Building an mp3 player with a friend - super lost.

Hey everyone, first time designing a PCB with my friend and I'd really appreciate a schematic review and any other comments. I am a programmer primarily, and my friend is the pcb guy and we're both very new to this hobby.

We're making a compact portable MP3 player inspired by the Sony NW-E507. It has microSD support, FM radio, bluetooth audio, 3.5mm output, and a 5 way navigation switch. It also has an oled display and charges via usb-c.

My main concerns are:

  1. Is the power chain correct? USB-C -> TP4056 -> LiPo -> power switch -> AMS1117 -> 3.3V rail
  2. PCM5102A application circuit. Are the support caps (LDOO, VNEG, CAPP) and config pin ties correct?
  3. Is the TP4056 PROG resistor (1.2K = 1A charge current) appropriate, or should I lower it?
  4. Anything obviously missing or dangerous before I order assembly?

Any feedback appreciated, even small things. Thanks

u/ember_r — 27 days ago