# George Brown

## Nixie Tube Experiments

I recently purchased a set of 12 IN-12A (ИН-12А) nixie tubes from Russia. I was eager to try them out and make sure they survived the trip. For this I built a very basic high voltage power supply to fire them up, and then got a bit carried away! This article concerns the use of a relatively high voltage supply. Stay safe when working with high voltage, and do not proceed until you are comfortable with the required precautions.

## HP1652B Power Inlet Repair

A few years back I bought myself a HP1652B, that’s an 80 channel logic analyser, with a two channel 100 MHz scope inside too! (Not bad for £150 eh?) In this post, I’ll cover the repair I made to the unit after it suffered a rather exciting failure. The Fault I’d been using the thing for a few months, until one day it went up in a cloud of very stinky smoke.

## GPS Vehicle Tracker

I frequently cover large distances by car, be it visiting friends or moving to work or university. At the moment it seems I can’t go very far without arriving at some part of the country disrupted by Smart Motorway upgrades, horrible peak time traffic, or something else entirely! I’m normally well equipped to deal with such hold ups, however without the ability to contact people while on the road, I can’t let them know where I am.

## 2m Tape Measure Yagi Antenna

Through the first half of 2016, British astronaut Tim Peake was aboard the ISS. During this time he carried out a number of 2m FM voice contacts with schools.. For the first few contacts, I used a Baofeng handy with a 2m whip antenna, which worked quite well for listening in, but it was not ideal. I also tried using my very basic $$\frac{1}{2}\lambda$$ antenna. This didn’t seem to work much better, and I was starting to notice some pager interference coming in too.