Electrical Engineering
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Ken Shirriff

Interested in computer history and reverse engineering old chips. Currently restoring a Xerox Alto.

Some projects: Wrote the Arduino IRremote library for infrared remotes. Attempted Bitcoin mining on a 55 year old IBM punch card mainframe. Got six symbols added to Unicode including the Bitcoin symbol (₿).

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Top posts (49) All Questions Answers | Votes Newest

17 does 8085 CPU have an extra register within ALU? Mar 23 '17
11 How can I duplicate Apple's tiny USB power adapter? May 19 '12
7 Why the extra transistors in this current mirror? Mar 15 '17
7 What is the reasoning for the arithmetic functions on the 74181? Jan 6 '17
6 What is the name of the current that creates the potential difference in an opamp? Mar 27 '17
4 Chaotic circuit for random number generation Jan 9 '17
4 How did bipolar IC density compare to MOS ICs? Jan 3 '17
4 RC low-pass filters for op-amp power-in pins? Dec 19 '16
4 Why is there a capacitor in the feedback path of a comparator, why is there a resistor on the input? Dec 19 '16
4 Precision Full-Wave Rectifier: Why is the signal's biggest magnitude at DC? Dec 20 '16
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