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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Switch / Router Learning Platform

Posted on 2024-03-19 by Nigel VH

I’ve been interested for a while in playing with ethernet switching on a hardware level, and decided to put together a platform to play with routing and switching hardware with a Raspberry Pi compute module, and an ‘off the shelf’ … 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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