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 […]
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 […]
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 […]
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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