Uploaded November 2025 | Updated September 2026, 5 days ago

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Creating a quiet galvanically isolated power rail for the transceiver …
↓↓↓ Complete description, time index and links below ↓↓↓

In the last video we finished the redesign of the ADC’s analog frontend (link below). But in order to get the noise down we had to sacrifice our CA-IS3098W isolated RS-485 transceiver (link below). Now let’s find a low noise replacement for it.

We start with a last ditch effort to tame the noise produced by the CA-IS3098W – which fails. Then we have a look at an alternative architecture. We come so far as to create a low noise isolated 5V rail using an isolated DC-DC converter.

00:00 Intro – salvage the CA-IS3098W or find an alternative
01:00 Recap – why I decided to abandon the CA-IS3098W
04:41 Last ditch effort – but the CA-IS3098W lost the war
07:34 Alternative – a separate isolated DC/DC converter
10:35 Tests – with the RECOM RFB-0505S DC/DC converter
17:32 Results – noise levels lower than before, eerily low
19:29 Wrap-up – next is analyzing the motor back EMF, bye

Full Fly-by-Wire Electric Outboard youtube.com/playlist?list=PLwq-2MnM58FKvpYgFXgNCjlKo14L0KI16
Full Fly-by-Wire Electric Outboard (22): Redesign of ADC Frontend (4) youtu.be/NUJgexQXoV4
Full Fly-by-Wire Electric Outboard (18): Chasing Noise & Intermittent Errors (1) youtu.be/QfDVx435YOE
Full Fly-by-Wire Electric Outboard (19): Chasing Noise & Intermittent Errors (2) youtu.be/WoKpIrfGIDM
Full Fly-by-Wire Electric Outboard (24): New Isolated RS-485 Transceiver (2) youtu.be/7B94gJ0ky80

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