Category Archives: Projects

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 →

Posted in Electronics, Projects | Leave a comment

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 →

Posted in Electronics, Projects, Technology | Leave a comment

GPS Timing Over USB

Posted on 2023-04-24 by Nigel VH

I recently posted about building this GPS receiver for use in making Stratum 1 NTP servers, and through conversation with some friends, I was interested understanding the performance difference in timing the Pulse-Per-Second (PPS) signal via the hardware serial port, … Continue reading →

Posted in Electronics, Projects, Technology | Leave a comment

Air Quality Sensor

Posted on 2023-03-03 by Nigel VH

A couple years ago I cobbled together a couple of air quality sensors to give my family and I a better idea of the state of the air in and outside our home, particularly during what seems to be becoming … Continue reading →

Posted in Electronics, Projects, Weather | Leave a comment

GPS Device for NTP Servers

Posted on 2023-01-21 by Nigel VH

I’ve made a few posts over the years about using GPS devices for precision timekeeping for NTP Stratum 1 servers, and recently the topic came up again with some colleagues to potentially build another one. My previous builds have been … Continue reading →

Posted in Electronics, Projects, Technology | 1 Comment