10th May 2013
A quick teaser video about my exhibit for Maker Faire 2013 in San Mateo.
7th May 2011
A quick video thanking everyone involved in the 555 contest using one of my prizes.
23rd October 2010
Simple blinkenlight project to Cylonify my workstation PC.
4th February 2010
Adventures in measuring the selectivity of MCU-controlled super-regenerative quartz crystal controlled receivers. Resulting in a very useful selective log power meter.
Parent article: MCU Controlled Super-regeneration with Quartz Oscillators.
23rd January 2010
A low-speed data link implemented using Pierce quartz crystal oscillators controlled by a microcontroller.
Contains 1 sub-article.
27th December 2009
I put together a USB ISP programmer for use with my Win32 laptop.
25th December 2009
A simple 4 channel, PMW-controlled, 240 LED Christmas Tree.
Contains 1 sub-article.
20th December 2009
A charlieplexed 19 LED animated Christmas star for my Christmas tree.
13th December 2009
A proof-of-concept test bed for a range of animated electronic Christmas decorations.
28th April 2009
I lash up an old Geiger tube and monitor the background radiation in the shack for a while.
6th March 2009
I implement sequential multi-tone Hellschreiber modulation in the 30 metre QRSS beacon.
Parent article: 30 Metre QRSS Beacon.
1st March 2009
A multiplexed 7-segment digital display for the bolometer.
Parent article: RF and Optical Bolometer.
27th February 2009
A simple hack to interface an ATtiny13's ADC to the PC serial port for data logging.
14th February 2009
An adapter for my ATtiny13 programmer so it can program ATtiny2313 devices.
Parent article: ATtiny13 Programmer.
30th December 2008
A simple test circuit for assessing inductor core saturation and measuring inductance as a function of inductor current.
28th December 2008
I try my hand at designing a switchmode power converter for a B+ supply using an Atmel ATtiny13 for the controller.
16th August 2008
I complete and box-up the QRSS beacon, and experiment with a vertical antenna.
Parent article: 30 Metre QRSS Beacon.
21st June 2008
A simple 1.5 Watt Morse beacon for 80 Metres.
Contains 3 sub-articles.
11th May 2008
A proof-of-concept POV display charlieplexing 6 LEDs.
4th May 2008
A step-counting pedometer which renders the step count as Morse Code for aural consumption.
3rd May 2008
I add a simple xtal clock source to the programmer.
Parent article: ATtiny13 Programmer.
3rd May 2008
A hack to unbrick ATtiny13s that you've stuffed up the fuses of.
27th April 2008
More progress on the PSK-31 beacon.
Parent article: PSK-31 Beacon Mark 1.
20th April 2008
Prototype PSK-31 Beacon Keyer.
Contains 1 sub-article.
19th April 2008
Simple parallel port programmer for the Atmel ATtiny13 (and similar ATtiny AVR range) chips.
Contains 2 sub-articles.
30th June 2003
A programmer for the AT89Cx051 series of microcontrollers. Uses the PC parallel port.
18th April 2003
A simple parallel port programmer for I2C 8-pin serial EEPROMs (24XX devices). It also works well as a general purpose I2C interface for your PC.