ELEL_2008-04.pdf

www.elektor.com APRIL 2008 AUS$ 12.90 - NZ$ 15.50 - SAR 84.95 - US$ 9.95 £ 9.90

electronics worldwide

audio ampliier

paX

Sweep Generator – with a Parallax SX28 micro

ATM18 AVR Board – ATmega88 building block

Radio has come a long way

Elektor

Internet

Radio

R17

revolutionary

DigiButler – a Coldire home automation server

Automotive Kits

Ignition Coil Driver

KC-5443 £13.00 + post & packing

Add this ignition coil driver to the KC-5442

Programmable Ignition System and you have a

complete stand-alone ignition system that will

trigger from a range of sources including points,

Hall Effect sensors, optical sensors, or the 5 volt

signal from the car's ECU. Kit includes PCB with

overlay and all specified components.

Ignition System

KC-5442 £26.25 + post & packing

This advanced and versatile ignition system can be used on

both two & four stroke engines. The system can be used to

modify the factory ignition timing or as the basis for a

stand-alone ignition system with variable ignition timing,

electronic coil control and anti-knock sensing. Kit supplied

with PCB, diecast case and all electronic components.

Features include:

• Timing retard & advance over a wide range

• Suitable for single coil systems

• Dwell adjustment

• Single or dual mapping ranges

• Max & min RPM adjustment

• Optional knock sensing

• Optional coil driver

Be one of the

first to get our brand new

colour catalogue. It’s bursting

with over 800 new products,

all with PDS pricing and in

full colour.

More Projects

Variable Boost Kit

for Turbochargers

KC-5438 £6.00 + post & packing

It's a very simple circuit with only a few components

to modify the factory boost levels. It works by

intercepting the boost signal from the car's engine

management computer and modifying the duty cycle of

the solenoid signal. Kit supplied in short form with PCB

with overlay, and all specified electronic components.

Knock Sensor

KC-5444 £5.00 + post & packing

Add this option to your KC-5442 Programmable High Energy

Ignition system and the unit will automatically retard the

ignition timing if knocking is detected. Ideal for high

performance cars running high octane fuel.

Requires a knock sensor which is

cheaply available from

most auto recyclers. Kit

supplied with PCB, and

all electronic components.

Hand Controller

KC-5386 £25.95 + post & packing

This LCD hand controller is required during the

initial setting-up procedure. It plugs into the main

unit and can be used while the engine is either

running or stopped. Using this Hand Controller, you

can set all the initial parameters and also program

the ignition advance/retard curve. Kit supplied with

silk screened and machined case, PCB, LCD, and all

electronic components.

Combine these

two kits to get the

most cost effective car

performance increase

on the market!

Fuel Cut

Defeat Kit

KC-5439 £6.00 + post & packing

This simple kit enables you to defeat the factory fuel

cut-out signal from your car's ECU and allows your

turbo charger to go beyond the typical 15-17psi factory

boost limit.

Note: Care should be taken

to ensure that the boost

level and fuel mixture

don’t reach unsafe

levels. Kit

includes PCB

with overlay,

and all electronic

components.

Three Stage FM Transmitter

KJ-8750 £6.50 + post & packing

This is a Three-Stage radio transmitter that is so stable you

could use it as your personal radio station and broadcast all

over you house. Great for experiments in audio transmission.

Includes a mic, PCB with overlay and all other parts.

• Requires 9V battery (not included)

• Instructions included in kit

How To Order

Post and Packing Charges

Order Value Cost

£10 - £49.99 £5

£50 - £99.99 £10

£100 - £199.99 £20

Order Value Cost

£200 - £499.99 £30

£500+

£40

10A 12VDC Motor

Speed Controller

KC-5225 £7.75 + post & packing

Use this kit for controlling 12V DC motors in cars such

as fuel injection pumps, water/air intercoolers and

water injection on performance cars. You can also use it

for headlight dimming and for running 12VDC motors in

24V vehicles. The kit will control loads up to 10 amps,

although the addition of an extra MOSFET

transistor will double that

capacity to an amazing

20 amps.

• Kit includes PCB

plus all electronic

components to build

the 10A version.

•ORDER ON-LINE

•ALL PRICING IN

POUND STERLING

•MINIMUM ORDER

ONLY £10

Max weight 12lb (5kg). Heavier parcels POA.

Minimum order £10.

Note: Products are despatched from Australia, so local

customs duty and taxes may apply.

How to order:

Phone: Call Australian Eastern Standard Time Mon-Fri

on 0800 032 7241. Fax: +61 28832 3118

Email: techstore@jaycarelectronics.co.uk

Post: 320 Victoria Rd, Rydalmere NSW 2116 Australia

Expect 10-14 days for air parcel delivery

Check out the Jaycar range in your FREE Catalogue - logon to

www.jaycarelectronics.co.uk/elektor

or check out the range at

www.jaycarelectronics.co.uk

0800 032 7241

(Monday - Friday 09.00 to 17.30 GMT + 10 hours only)

For those who want to write: 320 Victoria Rd,

Rydalmere NSW 2116 AUSTRALIA

NEW Jaycar Catalogue OUT NOW

order on-line at

www.jaycarelectronics.co.uk/catalogue

PC Oscilloscopes & Analyzers

DSO Test Instrument Software for BitScope Mixed Signal Oscilloscopes

4 Channel BitScope

2 Channel BitScope

Pocket Analyzer

Digital Storage Oscilloscope

Up to 4 analog channels using industry standard

probes or POD connected analog inputs.

BitScope DSO Software for Windows and Linux

�

BitScope DSO is fast and intuitive multi-channel test and measurement software for your

PC or notebook. Whether it's a digital scope, spectrum analyzer, mixed signal scope,

logic analyzer, waveform generator or data recorder, BitScope DSO supports them all.

Capture deep buffer one-shots or display waveforms live just like an analog scope.

Comprehensive test instrument integration means you can view the same data in

different ways simultaneously at the click of a button.

DSO may even be used stand-alone to share data with colleagues, students or

customers. Waveforms may be exported as portable image files or live captures replayed

on other PCs as if a BitScope was locally connected.

BitScope DSO supports all current BitScope models, auto-configures when it connects

and can manage multiple BitScopes concurrently. No manual setup is normally required.

Data export is available for use with third party software tools and BitScope's networked

data acquisition capabilities are fully supported.

Mixed Signal Oscilloscope

Capture and display up to 4 analog and 8 logic

channels with sophisticated cross-triggers.

Spectrum Analyzer

Integrated real-time spectrum analyzer for each

analog channel with concurrent waveform display.

Logic Analyzer

8 logic, External Trigger and special purpose

inputs to capture digital signals down to 25nS.

� Networking

Flexible network connectivity supporting

multi-scope operation, remote monitoring and

data acquisition.

� Data Export

Export data with DSO using portable CSV files or

use libraries to build custom BitScope solutions.

�

www.bitscope.com

4/2008 - elektor

�

Data Recorder

Record anything DSO can capture. Supports

live data replay and display export.

Spring time!

New initiatives at Elektor

I do hope spring is in the air when you

read this, because at the time of writing

I can only see hail and sleet from the

windows of Elektor House, and the wind

is howling in the chimneys. Elektor staff,

including myself, has just returned from

the Embedded 2008 show in Nurem-

berg, Germany. We were happy to see

not only representatives of small, large

and would-be companies active in the

microcontroller arena, but also a good

many readers of our publications. Long

time subscribers, occasional newsstand

buyers, newcomers… thanks for drop-

ping by and letting us know what you

like (and hate) about Elektor. Remark-

ably, none of our direct competitors had

a presence at the Embedded show, and

even the Circuit Cellar booth was empty.

Although the ATM18 and DigiButler

projects published in this issue were

developed well before the Embed-

ded 2008 show, it was good to meet

up with our contact persons at the

companies behind the initiatives and

discuss the progress. In the case of the

ATM18, a working quadrocopter could

be seen in action at the Elektor booth

(video on YouTube soon). DigiButler, our

open-source Coldire home automation

server, was demonstrated on the impres-

sive Freescale stand.

It’s dificult if not impossible to pinpoint

a single trend from this year’s Embed-

ded show, but the buzzwords are

deinitely C-to-hardware, open-source,

development kits, CAN, fabless com-

panies, core licensing and fun applica-

tions. Unfortunately, there was also a lot

of vapourware around.

Back to the world of discrete compo-

nents and (mostly) analogue design,

I guess publishing an audio power

ampliier using error correction can also

be called an initiative on our part, if

only because the high-end audio scene

seems to have regurgitated conventional

feedback concepts for more years than I

care to remember. Elektor having a ine

reputation for high-end audio designs

that can be built at home, it’s time for a

fresh, audacious, approach!

The concept of i-TRIXX — simple circuits

from the Elektor labs combined with

‘geeks & gadgets’ stuff supplied through

a free weekly newsletter — has proved

very successful in Germany and The

Netherlands over the past year or so,

and you may have seen a crop of i-TRIXX

circuits already in our December 2006

and 2007 issues. The English language

version of i-TRIXX was launched on 5

March — have a look at www.i-trixx.

com and play the quiz — I did badly.

Most solid state power ampliiers employ some form of global negative

feedback to reduce non-linearities and output impedance. In some cases,

designers exploit alternatives like feedforward to circumvent perceived

disadvantages of global negative feedback. The present design uses er-

ror correction as (re)deined by Malcolm Hawksford around 1984.

paX

a Power Ampliier with Error Correction

56 Frequency Sweep Oscillator

This project

found its

origins in a

need to see

and measure

the frequency

response of

audio ilters,

tone controls and

ampliiers in real

time. An SX28 mi-

crocontroller module from Paral-

lax turned out to be a really good means of implementing the circuit.

Jan Buiting

Editor

CONTENTS

Volume 34

April 2008

no. 376

projects

16 Elektor Internet Radio (EIR)

24 paX - a Power Ampliier with

Error Correction

34 DigiButler - a Coldire 32-bit

home automation server (1)

a Power Ampliier with Error Correction

40 ATM18 AVR Board

56 Frequency Sweep Oscilla-

tor

62 Keyboard goes Game

Controller

70 Lucky Dip

74 Design Tips:

Automatic aquarium feeder

Ultra-responsive peak detecto r

technology

34 DigiButler

48 Free, Open, Licentious

52 Designing Capacitive

Sensing Interfaces for

Home Appliances

68 Energy Conscious

73 Labtalk:

My microcontroller doesn’t go…

a Coldire 32-bit home

automation server (1)

Here’s advanced, all open-sour-

ce hardware and PC software

that allows remote switching of

electrical loads across networks

including the biggest we know

– the Internet. The ingredients

from the Freescale/Elektor kit-

chen: 32-bit embedded techno-

logy, free software, a low-cost

kit for the hardware and free

software tools.

info & market

6 Colophon

8 Mailbox

10 News & New Products

66 Review: μC goes Analogue

(Cypress PSoC)

80 Elektor SHOP

84 Sneak Preview

16 Elektor Internet Radio (EIR)

Nowadays you can access every Internet

radio programme in the world by receiving,

buffering and decompressing IP packages.

This is all very easy with the state-of-the-art hard-

ware described in this article. All open-source!

infotainment

76 Hexadoku

77 Retronics:

Formant synthesizer (1977)

Plik z chomika:

Inne pliki z tego folderu:

Inne foldery tego chomika: