14th December 2014
An electrostatic discharge wand with neon indicator lamp.
Parent article: Advent Calendar of Circuits 2014.
7th December 2014
The CAD files for the variable capacitor frame.
Parent article: Advent Calendar of Circuits 2014.
26th April 2011
Circuit diagram of the wireless power TX used in the video demonstration.
Parent article: Wireless Power Experiments.
19th March 2011
A simple direct-conversion receiver for the Homebrew Group challenge this year.
27th February 2011
A quick random dialling hack for the adding machine to demonstrate it at the Wyong Field Day.
Parent article: 555 Adding Machine.
5th February 2011
Junkbox electrical component blinking 555/LED spider sculpture project.
16th January 2011
A bit of fun with LEDs, transistors and capacitors.
18th December 2010
Electroluminescent trimmed backpack inspired by TRON.
27th November 2010
A simple picoammeter using an LMC662 op-amp.
23rd October 2010
Simple blinkenlight project to Cylonify my workstation PC.
20th May 2010
My quick go at estimating the size of the International Space Station and Space Shuttle Orbiter from the wonderful Thierry Legault solar transit photograph.
23rd December 2009
A large Christmas Star for my balcony made using a length of rope light and some timber dowelling.
Contains 1 sub-article.
8th December 2009
Some technical Yahoos assemble an office Christmas tree from over 430 soft drink cans.
18th April 2009
A quick hack based on Charles Wenzel's nuclear war detector.
24th February 2009
I finally sit down and calibrate the front-panel controls of the QRSS beacon.
Parent article: 30 Metre QRSS Beacon.
15th February 2009
A simple wiring pencil for digital circuit prototyping Verowire-style.
Contains 1 sub-article.
14th February 2009
An adapter for my ATtiny13 programmer so it can program ATtiny2313 devices.
Parent article: ATtiny13 Programmer.
29th January 2009
A small variometer-style variable inductor as a prototype study of an interpolating inductor for an antenna matching unit.
17th November 2008
A simple RF sniffer for detecting LF to SHF radiation.
28th September 2008
A simple coaxial feedline choke (aka braid-breaker) for antenna experiments.
23rd August 2008
A simple transformer-based -20 dB transmission line tap.
24th May 2008
A quickie showing what 400 NE-2 Neon glow lamps do if you put them in a microwave.
11th May 2008
A proof-of-concept POV display charlieplexing 6 LEDs.
3rd May 2008
I add a simple xtal clock source to the programmer.
Parent article: ATtiny13 Programmer.
19th April 2008
Simple parallel port programmer for the Atmel ATtiny13 (and similar ATtiny AVR range) chips.
Contains 2 sub-articles.
12th April 2008
My simple, fully isolated, audio keyed, PSK-31 interface for my FT-817ND.
29th February 2008
Using the Negistor to implement a simple sidetone for minimalist QRP rigs.
12th December 2007
I try to write an "about me" page.
9th September 2007
A simple 50 Ohm power meter adapter for a multimeter. (Also talks about my diode probe.)
3rd June 2007
How I fixed my toilet cistern inlet valve with a Coke bottle cap.
2nd June 2007
A quickie hack that actually worked pretty well.
28th April 2007
Simple variable resistance and capacitance jigs for the bench.
20th January 2007
Another rotating multi-draw cabinet.
Parent article: Parts Cabinet.
11th November 2006
A quick folded dipole antenna for 3 metres.
2nd September 2006
My copy of VK5BR's sweeper detector.
5th March 2005
An incredibly crude soda straw hydrometer.
18th February 2005
Iron gall ink and a bamboo pen of sorts.
15th February 2005
How to make your own flame test tool.
29th August 2003
An ancient Chinese invention, the Bamboo Dragonfly.
10th June 2003
Using red cabbage juice as a cheap homebrew pH indicator.
8th June 2003
A cardboard box pinhole camera that operates without film. The image is projected onto a screen for human observation. A quick and simple project to demonstrate pinhole optics.
10th May 2003
Fred Kennedy noticed the circuit diagram might be wrong.
Parent article: High Voltage Probes.
20th March 2003
Richard Solis asked me to post the circuit diagram.
Parent article: High Voltage Probes.
14th February 2003
A super simple inverter that will flash a neon brightly, powered by as little as a single 1.2 Volt rechargeable cell.
14th December 2002
A simple reflection-pair optical tachometer head for my CD structural integrity tests.
16th November 2002
An ultra-simple, very sensitive electrometer.
10th November 2002
My small implementation of Bill Beaty's soda bottle electrostatic motor.
10th November 2002
I've been working with high voltage quite a lot lately, so I decided to make myself some basic test equipment. Starting with a 1000:1 DC probe.
Contains 2 sub-articles.
10th November 2002
My first meeting with Bill of SolderSmoke fame.
Parent article: Trivial Electric Motor.
3rd November 2002
A simple interface for picking up the audio on a phone line.
3rd November 2002
Fooling around with a strobe light in the dark with long exposures.
27th October 2002
My small, and quite ugly, prototype built using house hold materials.
26th October 2002
Various fooling around with a old TV flyback transformer.
21st October 2002
Fooling around with a self-resonant long solenoid and modest RF power.
19th October 2002
My implementation of SM0VPO's cute little QRP linear amplifier.
17th October 2002
A simple demonstration DC motor you can build in 10 minutes with your children.
Contains 1 sub-article.
24th September 2001
A simple 14.91 MHz comb generator that I built for testing a S-Band dish.
24th September 2001
My bench amplifier that I use for listening to small AF signals.
31st August 2001
How I built my parts cabinet for all my electronic components.
Contains 1 sub-article.
27th August 2001
A quick hack to produce VHF/UHF and above test signals with ease.