Uploaded October 2025 | Updated September 2026, 2 days ago
Identifying noise source and causes of intermittent errors …
↓↓↓ Complete description, time index and links below ↓↓↓
In the previous video we tried to improve the analog frontend of our ADC with an op amp and a linear power supply. However, tests showed dramatically increased noise levels and intermittent errors (link below). Let’s find out why.
First we reverse all the hardware changes since the last time we had a look at raw ADC noise levels in video 9 (link below). Then we start to rebuild the circuit, trying to keep the noise levels down. It’s tedious work and there will be a part 2.
00:00 Intro – fighting noise and intermittent errors
01:04 Recap – noise 200 LSBpp / 58 LSBrms
03:02 Approach – reverse all changes step by step
04:34 Linear regulator gone – no intermittent errors
06:23 OpAmp gone – noise 45 LSBpp / 6 LSBrms
09:10 Aux. power gone – noise 30 LSBpp / 4 LSBrms
11:07 RS-485 transceiver gone – noise 18 LSBpp / 3 LSBrms
12:42 Power supply gone – noise 4 LSBpp / 1 LSBrms
14:11 Summary – a lot of things contribute to noise
16:34 Rebuilding – starting with 4 LSBpp / 1 LSBrms noise
16:54 Powering up power supply – noise 7 LSBpp / 1 LSBrms
18:40 Connecting 9V switched to VIN – noise 40 LSBpp / 7 LSBrms
19:27 Pi Filter on 9V switched rail – does absolutely nothing
21:19 Connecting 9V linear to VIN – noise 30 LSBpp / 4 LSBrms
22:44 Filtering 5V with 22µF –noise 30 LSBpp / 3 LSBrms
24:31 Filtering 5V with 0.1/1/10 µF –noise 25 LSBpp / 2.5 LSBrms
26:08 Supplying 5V linear directly – noise 25 LSBpp / 1.5 LSBrms
28:15 Wrap-up – I’m frustrated and we’ll continue next time, bye
Full Fly-by-Wire Electric Outboard youtube.com/playlist?list=PLwq-2MnM58FKvpYgFXgNCjlKo14L0KI16
Full Fly-by-Wire Electric Outboard (9): Voltage Measurement Circuit & Code youtu.be/TAGQqRPxVXc
Full Fly-by-Wire Electric Outboard (11): Power Supply Circuit (EMC Compliant) youtu.be/5_Q-G0tgG1o
Full Fly-by-Wire Electric Outboard (14): RS-485 Bus Hardware youtu.be/l2ASoGL9Jcs
Full Fly-by-Wire Electric Outboard (17): Redesign of ADC Frontend (2) youtu.be/UCdWR8KxRJ8
Full Fly-by-Wire Electric Outboard (19): Chasing Noise & Intermittent Errors (2) youtu.be/WoKpIrfGIDM
#flybywire #electricoutboard #haswing #trollingmotor #outboardmotor #outboard #robertssmorgasbord
Identifying noise source and causes of intermittent errors …
↓↓↓ Complete description, time index and links below ↓↓↓
In the previous video we tried to improve the analog frontend of our ADC with an op amp and a linear power supply. However, tests showed dramatically increased noise levels and intermittent errors (link below). Let’s find out why.
First we reverse all the hardware changes since the last time we had a look at raw ADC noise levels in video 9 (link below). Then we start to rebuild the circuit, trying to keep the noise levels down. It’s tedious work and there will be a part 2.
00:00 Intro – fighting noise and intermittent errors
01:04 Recap – noise 200 LSBpp / 58 LSBrms
03:02 Approach – reverse all changes step by step
04:34 Linear regulator gone – no intermittent errors
06:23 OpAmp gone – noise 45 LSBpp / 6 LSBrms
09:10 Aux. power gone – noise 30 LSBpp / 4 LSBrms
11:07 RS-485 transceiver gone – noise 18 LSBpp / 3 LSBrms
12:42 Power supply gone – noise 4 LSBpp / 1 LSBrms
14:11 Summary – a lot of things contribute to noise
16:34 Rebuilding – starting with 4 LSBpp / 1 LSBrms noise
16:54 Powering up power supply – noise 7 LSBpp / 1 LSBrms
18:40 Connecting 9V switched to VIN – noise 40 LSBpp / 7 LSBrms
19:27 Pi Filter on 9V switched rail – does absolutely nothing
21:19 Connecting 9V linear to VIN – noise 30 LSBpp / 4 LSBrms
22:44 Filtering 5V with 22µF –noise 30 LSBpp / 3 LSBrms
24:31 Filtering 5V with 0.1/1/10 µF –noise 25 LSBpp / 2.5 LSBrms
26:08 Supplying 5V linear directly – noise 25 LSBpp / 1.5 LSBrms
28:15 Wrap-up – I’m frustrated and we’ll continue next time, bye
Full Fly-by-Wire Electric Outboard youtube.com/playlist?list=PLwq-2MnM58FKvpYgFXgNCjlKo14L0KI16
Full Fly-by-Wire Electric Outboard (9): Voltage Measurement Circuit & Code youtu.be/TAGQqRPxVXc
Full Fly-by-Wire Electric Outboard (11): Power Supply Circuit (EMC Compliant) youtu.be/5_Q-G0tgG1o
Full Fly-by-Wire Electric Outboard (14): RS-485 Bus Hardware youtu.be/l2ASoGL9Jcs
Full Fly-by-Wire Electric Outboard (17): Redesign of ADC Frontend (2) youtu.be/UCdWR8KxRJ8
Full Fly-by-Wire Electric Outboard (19): Chasing Noise & Intermittent Errors (2) youtu.be/WoKpIrfGIDM
#flybywire #electricoutboard #haswing #trollingmotor #outboardmotor #outboard #robertssmorgasbord
