Author: admin

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GPSDO Frequency Reference

  • March 22, 2026
I needed a precise frequency reference in my lab. I’ve played around with Rubidium standards before, but I wanted to try GPSDO (GPS disciplined oscillator) this time. I installed a…
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RB5X Service Robot Build – part 2

  • March 3, 2026
It moves! Not autonomous yet, but it can be controlled via Bluetooth. I used an Arduino Uno, a XBee Bluetooth module, and a HW-095 motor controller. I can send it…
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Antique Spark Gap

  • March 1, 2026
I was lucky enough to win this antique spark gap at an estate auction. Two iron spheres held by brass posts on a marble base.
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Robie Jr. – Toy Robot Repair

  • February 25, 2026
I came across a non-working Robie Jr. robot from the 80s. After taking it apart, I noticed that some solder joints were broken, the wheel treads were falling apart, and…
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RB5X Service Robot Build – part 1

  • February 24, 2026
I have always had a thing for the service droids that were popular among robot enthusiast in the 70s-80s, but finding one of these vintage bots is near impossible now.…
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Stun Gun – version 2

  • February 14, 2026
Complete re-design for bigger, louder sparks. I traded the 9V alkaline battery for a rechargeable 18650 lithium cell. To keep it charged, there is a USB port and a lithium…
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Stun Gun – version 1

  • February 1, 2026
I made a stun gun. It’s a hot mess, but it does spark. Runs off a 9v alkaline battery, but I’m going to try lithium next time. Just ordered some…
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Nixie Tube Book

  • January 16, 2026
I self-published a book! This book is a restoration of the original Russian Nixie Tube datasheets (translated into English). The original technical drawings were faded and difficult to read, so…