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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This page provides .WAV files that can be combined with audio tracks to perform your own evaluation of the audibility of noise, both the unavoidable white noise and the excess noise (mostly low frequency) that is present in differing amounts based on the resistor technology.
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Performing some tests on a prototype circuit with an Audio Precision AP515 it was noticed that a particular power resistor showed an unexpectedly high amount of distortion, almost 0.5% THD+N.
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In the past only relative low power loads have been needed for the evaluation of monolithic class D amp chips as they are typically 25 watts and under. Now working with some 200W (8 ohms) – 400W (4 ohms) amps and beefier load resistors are needed. The following little parts are now on the bench:
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As part of an ongoing investigation in to excess noise (also called 1/f noise) from resistors I recorded some data taken with the AP515 and posting it here. All 3 tracks have 80 dB of gain added to them using Audacity. The actual signal level from the resistor is a few microvolts. The part being […]
Additional technical information (Technotes) about Clockworks products can be found in the (wait for it…) Technotes section. General technical topics are done as posts in the blog section, browsing through those is a great way to see more about what we’re working on. Posts are also tagged, you might want to look at: papers presentations […]