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John Duffy
John Duffy explains electronics through open-source hardware projects. The channel follows the design of the HydraMeter multimeter, including its circuitry and input protection, and explores how devices such as acoustic cameras turn sensor data into useful measurements.
John Duffy has featured 1 sponsor brand across 1 video.
900 subscribers4.3K median video views
Views across recent videos
4.3K medianDec 21, 2024Sep 16, 2026
- Video formats
- Engineering project walkthroughs and technical explainers
- Content focus
- Open-source electronics and measurement instruments
- Typical video length
- 27 minutes
- Found video language
- English
Sponsors & series support
Brands, dates and a video to see how each product fits.
Recent sampled videos
4 videos · views collected Oct 19, 2026
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