27th November 2011
I finally build Charles Wenzel's Curious C-Beeper capacitance probing tool.
3rd July 2011
An AC ion chamber detector for alpha particles only.
30th January 2011
A relatively unconventional but simple design HF spectrum analyser utilising a super-regenerative VHF IF for its log detector. Candidate utility category entry for the March 2011 555 Contest.
27th November 2010
A simple picoammeter using an LMC662 op-amp.
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.
1st February 2010
A RF power measuring head using the AD8307.
27th December 2009
I put together a USB ISP programmer for use with my Win32 laptop.
7th June 2009
New pancake Geiger Müller tubes and a fairly small power supply for them.
18th April 2009
A quick hack based on Charles Wenzel's nuclear war detector.
22nd March 2009
I finally assemble the bolometer sensor head into something resembling a completed unit.
Parent article: RF and Optical Bolometer.
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.
25th February 2009
A thermal balance power meter for RF and Optical energy.
Contains 3 sub-articles.
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.
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.
23rd December 2008
A two-component fix for the rail-to-rail oscillation of the ALC loop op-amp.
Parent article: MFJ-207 Review.
20th December 2008
Peter VK2TPM loans me his MFJ-269 to try out.
23rd November 2008
A simple 100 kHz to 30 MHz sweep generator.
22nd November 2008
My take on the MFJ-207 HF antenna bridge.
Contains 1 sub-article.
17th November 2008
A simple RF sniffer for detecting LF to SHF radiation.
26th October 2008
A Carver-style LC Test Device.
19th October 2008
Another wavemeter, this time for the lower half of VHF.
12th October 2008
An absorption wavemeter for HF having fairly good sensitivity.
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.
2nd August 2008
My slightly revamped return-loss bridge and using it for various measurements.
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.
19th April 2008
Simple parallel port programmer for the Atmel ATtiny13 (and similar ATtiny AVR range) chips.
Contains 2 sub-articles.
18th April 2008
Better circuit diagram drawing for the super-regen tone dipper.
Parent article: Super-Regenerative Tone Dipper.
27th January 2008
An interesting and quite useful autodyne receiver that phase locks the remote RF signal.
Contains 1 sub-article.
16th December 2007
Some experiments with a tuned receiving loop for HF.
30th September 2007
Another ARNSW trash and treasure day, including the Homebrew Group meeting with the display of the 80 metre challenge projects and a technical presentation on RF filters.
22nd September 2007
A super-regenerative dip meter that is extremely sensitive and easy to use.
Contains 1 sub-article.
16th September 2007
A simple dip meter using an audio tone as the read-out mechanism instead of a moving coil meter.
16th September 2007
A simple but useful nano-Henry inductance meter adapter for your frequency counter. Doubles as a capacitance meter and stability assessment device.
9th September 2007
A simple 50 Ohm power meter adapter for a multimeter. (Also talks about my diode probe.)
28th April 2007
Simple variable resistance and capacitance jigs for the bench.
4th March 2007
My implementation of Drew Diamond VK3XU's "Nano-L", plus how I constructed and trimmed my calibration inductances.
21st January 2007
A basic 50 Ohm switched attenuator.
13th January 2007
A very easy to get going VHF impedance bridge for antenna work.
18th November 2006
My go at making a JF1OZL-style spectrum analyser for 40 metres.
4th November 2006
An extremely useful RF sweep generator.
3rd September 2006
My implementation of Dick Cappels' simple RF Inductance Meter.
2nd September 2006
My copy of VK5BR's sweeper detector.
11th July 2003
Simple little parallel port breakout tool and software.
30th June 2003
A programmer for the AT89Cx051 series of microcontrollers. Uses the PC parallel port.
10th May 2003
Fred Kennedy noticed the circuit diagram might be wrong.
Parent article: High Voltage Probes.
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.
13th April 2003
My ugly implementation of Jens Dyekjĉr Madsen's PIC programmer.
20th March 2003
Richard Solis asked me to post the circuit diagram.
Parent article: High Voltage Probes.
22nd December 2002
Demodulation of microwave radiation using a Neon plasma.
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.
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.
27th August 2001
A quick hack to produce VHF/UHF and above test signals with ease.
3rd April 2000
A Linux driver for the Electronics Australia August 1996 Pocket Sampler project.