The Spreadsheet That Came Out at Minus 0.134 Watts

1,089 views · Published 27 August 2009 · 10:25 · Indexed 30 September 2026

Channel: Aaron Murakami · 2009 · Science & Technology

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A sample-by-sample power integration of the Rosemary Ainslie COP 17 circuit using the Tektronix TDS3054C, which captures 10,000 samples per channel across three channels. The waveform is exported and each sample's instantaneous wattage computed against the battery voltage at that moment, then averaged over 5,880 samples: the 555 timer comes out at minus 0.06578 W, the load at minus 0.0682 W, minus 0.13406 W in total. Temperatures are read at the same time, with the load and the 1 ohm resistor both sitting 0.8 C below a 25 C ambient while the timer feed resistor runs 8 C above it.

Chapters
0:00 Three channels, ten thousand samples each
2:58 Trimming the sample window
5:24 Integrating watts per sample
8:19 Load running below ambient

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Rosemary Ainslie COP 17 circuit, 2009 bench footage. Posted 2009-08-27.

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