The Amp Hour

The Joulescope Upgrade with Matt Liberty

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Welcome back, Matt Liberty, creator of the Joulescope! Matt was on The Amp Hour in early 2021 (Episode 527) talking about the previous product revision called the JS110. The new model is the JS220, which goes on sale November 2022.

  • Who uses the Joulescope?
  • Changes between JS110 and JS220
  • Switching to pub sub
  • PicoRV32 core (created by past guest Claire Wolf) on the ECP5
  • Specialized ALU on the ECP5 built with Verilog and cocotb
  • Matt got some help on the marketing/business side from Harris Kenny, cohost of the (now paused) Hello Blink show.
  • "Hit by a bus" test
  • Contact Matt (below) about helping with support on the JS220
  • Asking customers what they are really trying to achieve
  • On the consulting forum, we have heard part shortage stories
  • Ordering 500 from CM
  • Cashflow as a small business
  • Voltmeter and ammeter are separate now on the JS220
  • Matt sourced a custom cable assembly and carry case from Alibaba.
  • Testing stations at MFG
  • For tracking manufacturing, Matt uses PartsBox (former guest Jan Rychter)
  • Forecasting
  • Power supply is done with a Cuk (topology) converter to generate the -15v rail
  • Higher rails makes for more dynamic range.
  • The JS220 has more bits on the ADC (15.1 ENOB)
  • Enwavify
  • Measuring through range switches
  • Bounded error during times of switch
  • "Anyone who's played with mosfets says 'this is super weird' "
  • Power profiler from Nordic and similar chip company offerings will do some but not all measurements.
  • ISO17025
  • Why would you need 100 MHz of bandwidth? Only if you're able to probe directly on silicon
  • 300 kHz on the Joulescope for boards because that's likely what your board can handle with parasitics on the PCB
  • C API with Python bindings
  • Moving towards Simultaneous Device Support, bringing it to the UI
  • Matt Venn MPW shuttle
  • Evaluation kit with RP2040
  • Thonny is a simple IDE for Python
  • REPL
  • Using PIO onboard with the generation code in the examples for the RP2040
  • Reserve your JS220 today on Joulescope.com
  • Follow Matt on Twitter: @mliberty1
  • For support, visit the Joulescope Forum
  • Listen to Matt talk about working with contractors on Hello Blink episode 23
  • Check out Joulescope projects on GitHub
    • New Joulescope driver
    • JLS (file format)
    • Pyjoulescope (JS110 & new compatibility layer)
    • Joulescope UI
    • Joulescope examples
      ...more
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