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Issue 225   View the articles in this issue >>
Versatile 4-Input Mixer Turntables - Give 'em A Spin; Pt.2
Even More PICAXE Developments ... Frequency - Activated Switch For Cars

30 Jun, 2007

Versatile 4-Input Mixer

This low-cost 4-input mixer features low-noise input preamps, each of which can be configured to suit a wide range of signal sources: microphones, guitar pickups, tape decks, synthesisers or CD players. Other features include a built-in equaliser with bass, midrange and treble controls along with a monitoring amplifier which can drive stereo headphones.

30 Jun, 2007

Vintage Radio

There have always been odd little offshoots from the mainstream technology of radio and DC-to-AC inverters are one such offshoot. This month, we?ll take a look at two of those early inverter circuits and describe their restoration.

25 Jun, 2007

Turntables - Give 'em A Spin; Pt.2

Concluding our Turntable Review - this month we look at some of the software you'll need to clean up that old vinyl and save precious memories to CD.

22 Jun, 2007

Even More PICAXE Developments ...

As well as the new PICAXE 14-M introduced over the past few pages, Revolution Education Ltd, the UK based developers of the PICAXE system, have been hard at work for the last few months. Clive Seager talks us through the latest PICAXE developments.

17 Jun, 2007

Frequency - Activated Switch For Cars

A cheap, adjustable design that lets you switch devices on and off according to speed.

15 Jun, 2007

Fun With The New PICAXE 14M!

There's a new kid on the block! He's from the rapidly-growing PICAXE family (now with 11 siblings!) and goes by the name of 14-M. If you're a PICAXE fan, Stan wants you to meet him 'cos he's really friendly - especially if you already know his younger brother, 08-M!

11 Jun, 2007

A Knock Detector For The Programmable Ignition

The Programmable Ignition System would not be complete without the addition of engine knock sensing. This Knock Detector is useful for adjusting ignition timing maps and can also automatically retard the ignition timing if engine knock is detected.

10 Jun, 2007

VAF's New Soundwall

Spot the speakers in the above home theatre photo. Can't see them? Think they're Gone With the Wind? You're right: they are!

8 Jun, 2007

20W Class-A Amplifier Module; Pt. 2

In Pt.2 this month, we present the construction details for matching left and right channel mirror-image modules, together with the circuit and construction details of the power supply.

6 Jun, 2007

Circuit Notebook

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.

4 Jun, 2007

Publishers Letter

Business energy use can be greatly reduced

2 Jun, 2007

A flying visit CeBIT Australia 2007

There were lots of interesting products at this year's show.

1 Jun, 2007

Ask Silicon Chip

Issue 224   View the articles in this issue >>
Turntables - Give 'em A Spin; Pt 1 Circuit Notebook
GPS-Based Frequency Reference Circuit Mods & Additions Throttle Interface For The DC Motor Speed Controller

29 May, 2007

Mailbag

Letters and emails should contain complete name, address and daytime phone number. Letters to the Editor are submitted on the condition that Silicon Chip Publications Pty Ltd may edit and has the right to reproduce in electronic form and communicate these letters. This also applies to submissions to "Ask SILICON CHIP" and "Circuit Notebook".

28 May, 2007

Circuit Notebook

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.

26 May, 2007

GPS-Based Frequency Reference Circuit Mods & Additions

The short term frequency stability of the GPS-Based Frequency Reference described in the March and April issues can be improved with some circuit changes, as described here. It's also quite easy to add an RS-232C serial output, so the NMEA data stream from the GPS receiver module can be fed out to a PC for other purposes.

23 May, 2007

Throttle Interface For The DC Motor Speed Controller

Last month, we presented the High-Power Reversible DC Motor Speed Controller. Here is a companion controller which works with a motorcycle-style throttle control. It also features a forward/reverse switch to control the motor direction.

21 May, 2007

Programmable Ignition System For Cars; Pt.3

In Pt.2, we described how to build all the modules that comprise the Programmable Ignition System. This month, we describe the installation and setting up procedures and show you how to plot the ignition timing.

19 May, 2007

VU/Peak Meter With LCD Bargraphs

This easy-to-build bargraph VU meter makes it easy to record audio signals at the correct level. It shows both the average signal and peak levels in stereo on an LCD and you can adjust both the display range and number of steps. A digital display option is also available.

14 May, 2007

20W Class-A Amplifier Module

This new 20W class-A is a refinement of our very popular 15W class-A module published in July & August 1998. It features ultra-low distortion levels, very low noise levels and a greatly simplified power supply which improves overall efficiency. Since it runs in pure class-A mode, there is no crossover distortion at all.

12 May, 2007

Vintage Radio

Radio museums can tell us much about our radio history, as well as preserving many worthwhile items that would otherwise be lost. One of the best is at Kurrajong in NSW, just west of Sydney.

8 May, 2007

Adjustable 1.3-22V Regulated Power Supply

Want a regulated voltage that can be adjusted to suit your application? This Adjustable Power Supply is small, easy to build and can be adapted to produce a fully regulated voltage ranging from 1.3V to 22V at currents up to 1A.

6 May, 2007

Ask Silicon Chip

Got a technical problem? Can't understand a piece of jargon or some technical principle? Drop us a line and we'll answer your question. Write to: Ask Silicon Chip, PO Box 139, Collaroy Beach, NSW 2097 or send an email to silchip@siliconchip.com.au

4 May, 2007

Jaycar Sunswift III shatters race record

On 16th January this year, the Jaycar Sunswift III solar car rolled into Sydney after five and a half days on the road from Perth, shattering the previous West-East Transcontinental Record by three days. The UNSW Solar Racing Team is to be congratulated for their tremendous achievement.

3 May, 2007

Serviceman's Log

It's normally preferable to stick to servicing equipment that you know well in order to stay out of trouble. However, the whiff of cash can often tempt me to try my luck in fields outside my usual experience. In the long run though, it is the familiar stuff which pays the bills.

1 May, 2007

Publisher's Letter

New 20W class-A module is a step closer to perfection

Issue 223   View the articles in this issue >>
Programmable Ignition System For Car's PT.2 Mailbag
GPS-Based Frequency Reference; PT.2 Build a Jacob's Ladder

30 Apr, 2007

Programmable Ignition System For Car's PT.2

There are six versions to build; you choose the one suit your car's ignition pick-up system. Here's how to build the various modules.

30 Apr, 2007

Mailbag

26 Apr, 2007

GPS-Based Frequency Reference; PT.2

Last month, we published the circuit for our new GPS-Based Frequency Reference and described how it works. This month, we show you how to build and adjust it.

21 Apr, 2007

Build a Jacob's Ladder

High voltage displays have always been awe-inspiring. They not only look and sound spectacular - they even have a pungent smell, caused by the ozone which is generated by any high voltage discharge. One of the most fascinating high voltage displays is the Jacob's Ladder, in which a series of sparks continually climb between two vertical wires.

20 Apr, 2007

The proposed ban on incandescent lamps... What will it mean?

In February 2007, Malcolm Turnbull, Federal Minister for the Environment and Water Resources, announced that incandescent light bulbs would be phased out and replaced by more efficient lights such as the compact fluorescent light. Superficially, it seems like a good idea but closer examination shows that there would be substantial drawbacks.

15 Apr, 2007

High-Power Reversible DC Motor Speed Controller

This reversible DC motor speed controller uses a switchmode Mosfet bridge circuit that drives the motor. It can be controlled by a 1-2ms pulse train from a radio control system or by a single potentiometer to give forward/reverse throttle control. It can operate from 12V or 24V batteries at currents up to 20A with just four Mosfets in the bridge circuit.

12 Apr, 2007

Publisher's Letter

Banning incandescent lamps will have negligible effect on greenhouse gases

9 Apr, 2007

Introducing SPlat CC16

SPLat Controls, an Australian company that produces a range of home-grown industrial-strength controllers, recently added the credit-card sized 'CC16' to their line-up. This new controller sells for less than $100 yet includes many of the features of SPLat's more sophisticated controllers.

6 Apr, 2007

Vintage Radio

If you've never built a radio receiver, then a crystal set is a great place to start. Here's a design that's very easy to build and get going.

3 Apr, 2007

Serviceman's Log

Sorting out customer A/V installations

13 Apr, 2006

Dual PICAXE Infared Data Communication

What's this? Twin Picaxes? Is this Stan's idea of an April Fools Day Joke? Maybe he's just seeing double . . .

Issue 222   View the articles in this issue >>
SIMPLE DIGITAL PANEL METER for Low-voltage measurements Remote Volume Control Part 2
The Spark That Changed The World Programmable Ignition System For Cars; Pt.1

19 Mar, 2007

SIMPLE DIGITAL PANEL METER for Low-voltage measurements

Here's one of those really handy little projects that will cost very little but make life a whole lot easier when you want to measure voltage and current at the same time.

17 Mar, 2007

Remote Volume Control Part 2

Second article completes the construction & gives the set-up procedure

15 Mar, 2007

The Spark That Changed The World

While its origins were in the 19th century, it is widely recognized that radio - and in particular broadcast radio - was one of the most significant developments of the 20th century.

13 Mar, 2007

Programmable Ignition System For Cars; Pt.1

Want to program the ignition timing on your car? Now you can, with this completely new design. It can be used in older cars which presently do not have electronic ignition or used as an "interceptor" for cars with engine management systems.

11 Mar, 2007

GPS-Based Frequency Reference; Part.1

Need a source of very accurate 10MHz and 1MHz signals for calibrating frequency counters, radio receivers and signal generators? Here's just what you need: a frequency reference which is linked to the Global Positioning System (GPS) satellites, to take advantage of their highly accurate on-board caesium-beam "atomic clocks".

9 Mar, 2007

Mailbag

7 Mar, 2007

Publisher's Letter

5 Mar, 2007

PCs - Taking Glass Way Beyond the Simple Window Pane!

Silicon. One of the Earth's most prolific substances, yet so important in our 21st century lives - from computers to disc technology - and glass.

3 Mar, 2007

Serviceman's Log

Variations of the original mousetrap

1 Mar, 2007

Vintage Radio

Radio transceivers designed for use with the Royal Flying Doctor Service (RFDS) are now scarce but well worth collecting. My EILCO RFDS radio transceiver is one recent acquisition that I've been able to fully restore.

Issue 221   View the articles in this issue >>
Circuit Notebook A Fuel Cut Defeater For Cars With Variable Boost Control
Simple Variable Boost Control For Cars With Turbochargers Low-Cost 50MHz Frequency Meter; Mk.2

27 Feb, 2007

Circuit Notebook

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.

26 Feb, 2007

A Fuel Cut Defeater For Cars With Variable Boost Control

Are you intending to build the Variable Boost Control described earlier? If so, you will need to built this simple Fuel Cut Defeater (FCD) to eliminate the standard factory fuel cut which typically occurs at boost levels about 16-17psi. The unit is not adjustable, so no external controls are required.

25 Feb, 2007

Simple Variable Boost Control For Cars With Turbochargers

Quite a few cars have turbochargers these days and these can provide even more performance if the turbo boost pressure is increased. However, you don't want permanently increased turbo boost as it increases wear on the engine, so you need a variable boost control, as presented here.

24 Feb, 2007

Low-Cost 50MHz Frequency Meter; Mk.2

This update of our very popular compact 50MHz Frequency Meter now has an internal battery pack or can run from a DC plugpack supply. It also incorporates a 10kHz rounding mode to enable 36MHz R/C transmitters using pulse position modulation (PPM) to be measured with an unambiguous reading.

23 Feb, 2007

Remote Volume Control & Preamplifier Module

This up-to-date control module works with any universal infrared remote and features a blue LED readout and an optional rotary encoder. Its ability to both attenuate and amplify means that it can operate as a simple volume control or as a high-performance stereo preamplifier!

19 Feb, 2007

Teac GF350 Turntable/CD Burner

For those people who don't want to bother with a separate turntable, a computer and software, Teac has produced a single box solution for the chore of dubbing vinyl records to CDs.

17 Feb, 2007

Vintage Radio

Based on miniature 1.4V filament valves, compact portable radios such as the Breville 801 enjoyed a brief period of popularity during the late 1940s and early 1950s. Their performance was rather mediocre, however.

15 Feb, 2007

Publisher's Letter

Let's not vacillate on nuclear power

13 Feb, 2007

Bike Computer To Digital Ammeter Conversion

Electronics is just as much about adaptation as it is invention. Here Stan takes a cheap bike computer and turns it into a digital amp-hour meter with the aid of his No.1 favourite chip, the mighty Picaxe!

10 Feb, 2007

Serviceman's Log

Customers & their strange antics

7 Feb, 2007

Jaycar Gets Into Wireless Microphones

Jaycar enters the wireless microphone marcket with three attractively-priced models.

3 Feb, 2007

Viganella: Solar Power With A Twist

Imagine living in a village with no sunlight for 84 days straight. The Italian village of Viganella solved the problem using a giant mirror

1 Feb, 2007

Ask Silicon Chip

Got a technical problem? Can't understand a piece of jargon or some technical principle? Drop us a line and we'll answer your question. Write to: Ask Silicon Chip, PO Box 139, Collaroy Beach, NSW 2097 or send an email to silchip@siliconchip.com.au

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