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Table of Contents Elektor July/August 2009

• 0–18 MHz Receiver
  
• 12 V AC Dimmer
  
• Acoustic Distress Beacon
  
• An E-Blocks IR RC5 Decoder
  
• Annoy-a-Tron
  
• Audio Source Enhancer
  
• Automatic Bicycle Light
  
• Automatic Curtain Opener
  
• Automatic TV Lighting Switch
  
• Backlight Delay
  
• Bathroom Fan Controller
  
• Braitenberg Robot
  
• Breadboard/Perfboard Combo
  
• Cheap Serial Port for the Mac
  
• Chill Out Loud
  
• Control Interface via PC Keyboard
  
• Cut-rate Motorbike Alarm
  
• Daylight Switch
  
• Desulphater for Car Batteries
  
• Digital Sweep and Sinewave Generator with direct frequency entry
  
• Dimmable Aquarium Light with Simulated Sunrise and Sunset
  
• DMX Transmitter
  
• Doubling Up with the PR4401/02
  
• Driver Free USB
  
• Easy LEGO Robotics Set Up
  
• Economy Timer
  
• ElektorWheelie
  The electronics behind a rather special kind of vehicle
• Fan Speed Controller
  
• Floating Message
  
• FM Audio Transmitter
  
• Four-component Missing-pulse Detector
  
• Freezer Trick
  
• Frequency and Time Reference with ATtiny2313
  
• Frequency Divider with 50% Duty Cycle
  
• Full-colour Night-flight Illumination
  
• Going for Gold
  
• Guitar Amplifier PSU
  
• Guitar Pick-up Tone Extender
  
• Hassle-free Placement of SMD Components
  
• Hexamurai July/August 2009
  Who'll be the one to beat it?
• I2C Display
  
• Impact Clock
  
• Improved Hybrid HeadPhone Amplifier
  
• Lead Acid Battery Protector
  
• LED Bicycle Lights
  
• LEDify It!, mobile 3-watt LED Lamp
  
• Lighting Up Model Aircraft
  
• LiPo Monitor
  
• Lithium Battery Charger using BQ24103
  
• Load Protection for Audio Amplifiers
  
• Long Duration Timer using ATtiny2313
  
• Low-drop Series Regulator using a TL431
  
• Luxeon Logic, brightness control for LED torches
  
• Measuring Milliohms with a Multimeter
  
• Micropower Crystal Oscillator
  
• Momentary Action with a Wireless Switch
  
• Network RS232
  
• One Wire RS-232 Half Duplex
  
• PC Power Saver
  
• Phone Ring Repeater
  
• PIC Detects Rotation Direction
  
• Port Expander
  
• Power On Indicator
  
• Powering a Second Hard Drive
  
• Power-up/down Sequencer
  
• PR4401 1-Watt LED Driver
  
• Preamplifier for RF Sweep Generator
  
• Pre-emphasis for FM Transmitter
  
• Programmable Nokia RTTTL Player
  
• Pseudo Fan
  
• Pulse Clock Driver with DCF Synchronisation
  
• Quartz Crystal Tester
  
• Remote Control for Network Devices
  
• Remote Washing Machine Alert
  
• Sensitive Audio Power Meter
  
• Servo Driver
  
• Servo Scales
  
• Simple Temperature Measurement and Control
  
• Simple Wire Link Bender
  
• Simple Wireless and Wired Emergency Stop System
  
• Single Lithium Cell Charger
  
• Single-cell Power Supply
  
• Six-digit Display with SPI Port
  
• Slow Glow
  
• SMD Transistor Tester
  
• Smoggy, use your Walkman to detect electrosmog
  
• Snail Mail Detector
  
• Solar-driven Moisture Detector
  
• Speed Control
  
• SRPP Headphone Amplifier
  
• SSR 2.0, OptoMOS semiconductor relays
  
• Start-up Aid for PCs
  
• Stereo Widening
  
• Stress-o-Meter
  
• S-video Converter
  
• Switching Delay
  
• Tester for Inductive Sensors
  
• TL431 Multivibrator
  
• TurboGrafx-16 (PC-Engine) RGB Amplifier
  
• Two TV Sets on a Single Receiver
  
• Two-button Digital Lock
  
• USB Radio Terminal
  
• USB Switch
  
• VGA Background Lighting
  
• Vocal Adaptor for Bass Guitar Amp
  
• Wireless Baby Monitor
  
• Wireless S/PDIF Connection