A2B Module EVM
A2B EVM provides stereo audio I/O for A2B.
Resistor Noise in Audio: The Sound of Angels Dancing on the Head of a Pin (Presentation from Teardown 2019)
Video from a presentation at Teardown 2019. Unfortunately the audio is out of sync with the video, and a little is missing off the front. This is a based on the work done for the AES paper and the background materials found here (including the audio files for experimenting with audible noise levels). It’s less […]
Using Excel for discrete Fourier transforms
Microsoft Excel probably doesn’t pop in to most people’s minds for doing spectral analysis, and that’s no surprise since it’s somewhat of a kluge to do it. But Excel is good to use for a quick sanity check when you are working in a different environment (in this case with Octave/Matlab .m files) and need […]
TechNotes
Clockworks’ TechNotes cover a wide range of topics related to Clockworks products. Most of them are developed during the engineering verification stage of testing the various modules in the SignalBlox design. They document the good, the bad, and the just plain ugly mistakes that can happen during product development. They also provide more details about […]
Power resistors for amplifier testing – the solution
This is the long delayed followup to the earlier post about power resistors as dummy loads and the nonlinearities found. After some further experimentation an 8 ohm load was built from four Riedon PF2270 series 2 ohm 200W thin film resistors (to give an 8 ohm load) and a surplus heatsink with fans. With 200W […]
Class D amplifier measurement filter
As part of some ongoing work earlier this year I needed to test the performance of a high performance 200W/channel class D amp (more on the amp in some future post). To get accurate SNR and THD+N measurements a low pass filter is needed in front of the measurement system as the high frequency switching […]
Audio Builders Workshop Metronome Project source files
Clockworks and Audio Builders Workshop (ABW, a working group of the Boston chapter of the Audio Engineering Society) created a simple Metronome project for people interested in building their own audio electronics. It’s intended as an entry level project for anyone interested in learning about building electronics kits. ABW has “build events” where the parts […]
Not always the green ones…why wire still isn’t wire
In a previous post a distortion producing alligator clip was unearthed. In this post high resistance test leads are discovered. These are generic banana plug to alligator clips (Vellman TLM3) that were purchased from Jameco: which are obvious generic made in China ones but from a reputable supplier versus the ebay/alibaba mystery stuff. Using them […]
Resistor noise – the experiment and the results
This post is one of three related to the work done to measure resistor excess noise. A summary writeup and three other documents with experimental detail are provided to those interested in performing their own experiments. These long form reports were summarized in to AES eBrief 486 (open access), presented at AES 145 (Oct 2018, NY, NY).
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Resistor noise presentation
From the presentation at the Boston AES meeting held 27-Feb-18 at Shillman Hall, Northeastern University, Boston, MA. In addition to being a technical presentation aimed at anyone involved with audio, it also served as an example for students interested in submitting papers to upcoming AES events.
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