Category Archives: Electronics

Stratum 1 NTP Rubidium Holdover

Posted on 2026-06-19 by Nigel VH

I’ve posted a number of times about building NTP Stratum 1 systems based on GPS receivers outputting PPS signals. Sometimes, however, GPS signals aren’t always reliable if you don’t have access to an external antenna, so I’ve been wanting to … Continue reading →

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FCIX Coins

Posted on 2026-04-21 by Nigel VH

Back in 2018, a group of friends and I with the bad habit of letting hobbies grow beyond any reasonable measure, founded an internet exchange in the datacenter where we all had racks of gear. Originally we had just run … Continue reading →

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HP 6632B Upgrades

Posted on 2025-02-21 by Nigel VH

I recently picked up an old HP 6632B power supply to add to my electronics bench. It’s overall a nice supply, and is capable of two-quadrant operation so it’s useful for discharge testing batteries as well. Unfortunately, the unit I … Continue reading →

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Numitron Clock

Posted on 2025-01-10 by Nigel VH

After watching a recent Technology Connections video about Numitron tubes, I was inspired to pick some up to add to my dragon’s hoard of junk. A quick visit to eBay later, and a few less dollars in my bank account, … Continue reading →

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Homebrew OOB & Stratum 1 Reprise

Posted on 2024-12-07 by Nigel VH

A few years ago I posted about a homebrew box I made containing a cell modem, a GPS receiver, and a couple of Raspberry Pi SBCs to handle Out-of-Band access to my gear at the datacenter where I only have … Continue reading →

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