Category Archives: Electronics

HP 3478A Repair

Posted on 2024-04-26 by Nigel VH

I’ll start with noting that these repairs on the HP 3478A (and many other older HP instruments) are well documented amongst the community. I mostly referenced the excellent write-up here by Tom. I mostly followed the procedure described, I backed … Continue reading →

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UPS Expansion Butchery

Posted on 2024-02-20 by Nigel VH

I picked up a used Emerson Liebert Vertiv GXT4 Double-Conversion UPS a little while back to better handle the dirty power coming from my portable generator, while feeding my server cabinet at the house. The internal batteries work fine, but … Continue reading →

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Laser Tape Measure

Posted on 2024-01-18 by Nigel VH

I got one of the little Bosch laser tape measure devices as a gift for the holidays. It’s an impressive little device, and is remarkably accurate. I’m curious how it makes the measurement, because the timing requirements to directly measure … Continue reading →

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Customizing a Smart Plug – Part 2

Posted on 2024-01-18 by Nigel VH

In the first part of this endeavor, I opened up a some Wyze Plug Outdoor units, and reprogrammed the ESP32 inside with my own control code. These units have been working really well, and I wanted to add some of … Continue reading →

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Holiday Ornament

Posted on 2024-01-17 by Nigel VH

A quick photo of some holiday ornaments I made this year. The boards use RGB LEDs, silkscreen, and gold plating for decoration. The batteries will run it for more than 100 hours of continuous runtime. Made for some good little … Continue reading →

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