KA7OEI's blog

Random musings - usually on a technical (nerdy) subject - perhaps related to amateur radio and things found at ka7oei.com and modulatedlight.org. No AI is used to generate this content.

Tuesday, August 30, 2022

Making a "Word Metronome" for pacing of speech

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Figure 1: The completed "Word Metronome". There are two recessed buttons on the front and the lights on on the left side. Click o...

Sunday, July 31, 2022

Improving my ultrasonic sniffer for finding power line arcing by using MEMs microphones

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Figure 1: The packaged MEMs microphone, along with the ultrasonic receiver. Click on the image for a larger version. Years ago - probably 20...

Wednesday, June 29, 2022

The use case for a blinking infrared LED

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Many years ago at a company where I worked we had two sets of computer systems: The ones that we used every day for engineering purposes, a...

Saturday, May 28, 2022

Fixing a TS-570G (The tuner couldn't find a match, timing out...)

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The TS-570D's front panel A couple of months ago I happened to be at a swap meet in Northern Utah and talking to a gentlemen - with who...

3 comments:

Saturday, April 30, 2022

Implementing the (functional equivalent of a) Hilbert Transform with minimal overhead

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I recently had a need to take existing audio and derive a quadrature pair of audio channels from this single source (e.g. the two channels b...

Sunday, February 27, 2022

High power Tayloe (a.k.a. Wheatstone) absorptive bridge for VSWR indication and rig protection.

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Figure 1: The completed absorptive VSWR bridge. Last year, I was "car camping" with a bunch of friends - all of which happened t...

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