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Circuit Notebook
14 March 2010
Interesting circuit ideas which we have checked but not built and tested. Contributions from
readers are welcome and will be paid for at standard rates.
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A Low-Capacitance Adaptor for DMMs
12 March 2010
This neat little adaptor allows a standard digital multimeter to measure low values of capacitance
- from less than one picofarad to over 10nF. It will allow you to measure tiny capacitors or stray capacitances in switches, connectors and wiring.
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An Innovative Early-Warning System For Bushfires
10 March 2010
You can sense the frustration in this first-hand account of the design and development of an effective, targeted and most of all affordable natural disaster warning system. Developed specifically in response to those terrible bushfires of a year ago, everyone who sees it says "fantastic!" So why is it languishing in some bureaucrat's "in" tray?
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Digital Audio Signal Generator, Part 1
08 March 2010
This Digital Audio Signal Generator has TOSLINK and coax (S/PDIF) digital outputs, as well as two analog audio outputs. If a digital output is used, the harmonic distortion from a high quality DAC is extremely low. Alternatively, if you use the analog outputs the harmonic distortion of the sinewave signal is typically still very low at less than .06%.
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A Solar-Powered Intruder Alarm For Sheds & Boats
06 March 2010
Most blokes have got a shed - or wish they had! While many people have alarms for their home and cars, a lot of valuable stuff is unprotected in garages and sheds. It needs protecting and now you can do it with this simple alarm based on a PIR sensor. It's solar-powered so no mains supply is needed. And let's not forget boats on moorings - they need protecting too.
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Digital TV: Where To From Here?
04 March 2010
Digital TV commenced in Australia on 1st January 2001 - yes, nine years ago, making Australia one of the first countries to start regular DTV transmissions. These transmissions now cover 60% of the population but for Australians to get full HD programming, we need MPEG-4 broadcasts. At present, we are being short-changed.
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A Look At The MacBook 2010
02 March 2010
Computer companies release their latest models with much fanfare and we all go 'ho-hum', as the look and feel of a new computer soon vapourises when we discover bugs, plus a host of software and drivers won't work without expensive upgrades. This time Apple should have bought out the brass band and fireworks!
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Circuit Notebook
21 February 2010
Interesting circuit ideas which we have checked but not built and tested. Contributions from
readers are welcome and will be paid for at standard rates.
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Internet Time Display Module For The WIB
15 February 2010
Looking for a really accurate clock? This simple add-on board for the WIB (Web Server In A Box) displays the time and date, as gathered from an internet time server. You can use it as a clock you never need to adjust and it can even be configured in the WIB to automatically adjust for daylight saving time.
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