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12V Speed Controller/Lamp Dimmer
15 November 2008
This handy circuit can be used as a speed controller for a 12V motor rated up to 5A (continuous) or as a dimmer for a 12V halogen or standard incandescent lamp rated up to 50W. It varies the power to the load (motor or lamp) using pulse width modulation (PWM) at a pulse frequency of around 220Hz.
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Playing With The AirNav RadarBox
13 November 2008
Ever wanted to be an air traffic controller? This will let you experience it all - from the comfort of your PC!
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USB Clock With LCD Readout, Pt.1
27 October 2008
This LCD USB Clock connects to your PC's USB port. It synchronises its time with your PC - and ultimately an internet time server - when your PC is on to maintain accurate time-keeping. It can also operate on its own using battery back-up and has user-selectable display modes.
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Exposing PC Boards In A Modified Microwave Oven
25 October 2008
I decided to build the UV exposure box for photo-sensitive PC boards, as published in the November 2007 SILICON CHIP. The first thought I had was to use the timer module in an old microwave oven, instead of building the timer design used in the project.
Then I thought: "Why not use the whole oven?"
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Versatile Special Function Timer
23 October 2008
This automatic timer has a wide range of applications whereby a timing cycle is initiated in response to a trigger signal. There are quite a few uses for it in a car or you could use it on a model railway layout, in a home security system or whatever.
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Circuit Notebook
19 October 2008
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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Digital RF Level & Power Meter
17 October 2008
Need to measure small signals at radio frequencies? Here is a low-cost digital level and power meter which will allow you to measure RF signals from below 50kHz to above 500MHz. As well as indicating the signal level in volts and dBV, it also shows the corresponding power level (into 50 ohms) in both milliwatts and dBm.
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Picaxe-08M 433MHz Data Transceiver
15 October 2008
Telemetry (from the Greek tele = remote and metron = measure) refers to the remote measurement and reporting of information, typically using wireless links to carry the data. Such technology is well established in climatic monitoring (especially temperature), water management, motor sport, security, medicine, defence and even space - Martian probe style.
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View all feature articles 
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11 November 2008 Vintage Radio 07 November 2008 Serviceman's Log 05 November 2008 Mailbag 03 November 2008 Publisher's Letter 01 November 2008 Ask Silicon Chip 25 October 2008 Publisher's Letter 21 October 2008 Vintage Radio 11 October 2008 Ask Silicon Chip 05 October 2008 Mailbag 18 September 2008 Circuit Notebook 17 September 2008 Vintage Radio 04 September 2008 Ask Silicon Chip 02 September 2008 Publisher's Letter 01 September 2008 Mailbag 15 August 2008 Vintage Radio 08 August 2008 Product Showcase 01 August 2008 Mailbag Ask Silicon Chip 30 July 2008 Publisher's Letter 10 July 2008 Ask Silicon Chip 26 June 2008 Publisher's Letter 22 June 2008 Serviceman's Log 06 June 2008 Mailbag 03 June 2008 Vintage Radio 02 June 2008 Ask Silicon Chip 26 May 2008 Publisher's Letter 19 May 2008 Circuit Notebook Serviceman's Log 08 May 2008 Ask Silicon Chip Mailbag
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