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.

Wednesday, November 16, 2022

Using an inexpensive PT2399 music reverb/effects board as an audio delay (for repeater use)

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Figure 1: Inexpensive PT2399-based audio delay board as found on the usual Internet sites. Click on the image for a larger version. In an e...

Sunday, October 30, 2022

An ultrasonic superheterodyne receive converter (e.g. "Bat Listener")

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In the mid 90s I decided to throw together what I called a "Bat Listener" - a simple receiver used to convert ultrasonic sound dow...

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Tuesday, September 27, 2022

Using an ATX computer power supply to run KiwiSDRs - and as a general purpose 5 and 12 volt supply

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At the Northern Utah WebSDR (link) we run a number of KiwiSDR receivers. These receivers, which are inherently broadband (10 kHz to 30 MHz...

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...

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