Uploaded August 2025 | Updated September 2026, 4 days ago

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Building a low loss EMS and EMI compliant power supply …
↓↓↓ Complete description, time index and links below ↓↓↓

Last time we implemented a water intrusion detection that can discriminate between rain, fresh and salt water (link below). Today we will build an efficient EMC compliant power supply to run our electronics from the 20V to 29.2V battery rail.

We start with the requirements for our power supply. Then we talk about the switch mode regulator I have chosen and the circuit around it to make it EMS and EMI compliant. Finally we build the whole thing on a breadboard and test it.

00:00 Intro – powering our electronics from the battery
00:48 Requirements – Vin range, Vout, power and EMC
03:58 Regulator – switch mode K7809 from Mornsun
08:13 Circuit – EMS & EMI filter and regulator with caps
11:19 Breadboard – I didn’t have all the parts available
14:04 Tests – without & with the Nano’s Vin pin connected
15:07 Wrap-up – ran out of parts, there will be a pause, bye

Full Fly-by-Wire Electric Outboard youtube.com/playlist?list=PLwq-2MnM58FKvpYgFXgNCjlKo14L0KI16
Full Fly-by-Wire Electric Outboard (10): Water Intrusion Detection Circuit & Code youtu.be/7OSBXC-3OzY
Full Fly-by-Wire Electric Outboard (12): Temperature Monitoring Circuit & Code youtu.be/V6Y079WdSEc

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