Uploaded November 2025 | Updated September 2026, 1 day ago

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Continuing to identify noise source and causes of intermittent errors …
↓↓↓ Complete description, time index and links below ↓↓↓

After a rather frustrating last video, where we stripped down the circuit step by step to identify noise sources and – mostly unsuccessfully – tried to rebuild with lower noise levels (link below), we’re bound to make some headway today.

First we reroute 5V, GND and SPI lines which gets rid of the intermittent errors and reduces the noise. Adding a linear regulator after the switched one reduces the noise even further. Finally we stop an op amp from oscillating and we’re done.

00:00 Intro – we’ll continue to fight the noise and errors
00:49 Recap – 25 LSBpp / 1.5 LSBrms noise and errors
02:16 Rerouted power & SPI – 1.2 LSBrms noise, errors gone
06:18 USB power bank for 5V – 15 LSBpp / 1.2 LSBrms noise
07:30 Switched & linear regulator – 5 LSBpp / 0.6 LSBrms noise
11:28 RS-485 transceiver – 60 LSBpp / 8 LSBrms noise, has to go
14:39 OpAmp oscillating – 20 LSBpp / 40 LSBrms noise, why?
19:11 OpAmp stable – 8 LSBpp / 0.8 LSBrms noise, 100nF removed!
24:19 Separate 5V supply for analog stuff – not worth the effort
26:05 Wrap-up – next time we enjoy the fruits of our labor, bye

Full Fly-by-Wire Electric Outboard youtube.com/playlist?list=PLwq-2MnM58FKvpYgFXgNCjlKo14L0KI16
Full Fly-by-Wire Electric Outboard (17): Redesign of ADC Frontend (2) youtu.be/UCdWR8KxRJ8
Full Fly-by-Wire Electric Outboard (18): Chasing Noise & Intermittent Errors (1) youtu.be/QfDVx435YOE
Full Fly-by-Wire Electric Outboard (20): Redesign of ADC Frontend (3) youtu.be/afYJ_P5zH8A

#flybywire #electricoutboard #haswing #trollingmotor #outboardmotor #outboard #robertssmorgasbord