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Table of Contents Elektor July/August 2008

• Tracking Solar Panel
  
• Portable Thermometer
  
• Multitasking Pins
  
• Environmentally-friendly Mosquito Repeller
  
• Dimmable LED Light
  
• Solar-powered Automatic Lighting
  
• Fog Lamp Sensor
  
• Battery Discharge Meter
  
• Mysterious Self Charging
  
• LED Tester
  
• Wireless Audio Transmitter
  
• Gas Flow Meter
  
• RFID Door Opener
  
• Bell Alarm
  
• Smart Chocolate Block
  
• Slave Flash Trigger
  
• Operating Hour Counter
  
• Put that Light Out!
  
• Post-box Monitor
  
• Lamp in a Wine Bottle
  
• Pitch Meter for Model Helicopters
  
• Smooth Flasher
  
• Deluxe 123 Game
  
• Temperature Sensor with 2-Wire Interface
  
• Video Isolator
  
• Reaction Race using ATtiny13
  
• 48-V Microphone Supply
  
• Discrete PWM Generator
  
• Simple One-wire Touch Detector
  
• Solar Cell Voltage Indicator
  
• Minimalist Oscilloscope
  
• Underwater Magic
  
• Flowcode for Garden Lighting
  
• The Gentle Touch
  
• High-intensity LED Warning Flasher
  
• Stroboscope with Trigger Input
  
• Remote Control Mains Switch
  
• Tent Alarm
  
• Gratis Symmetrical Opamp Supply Voltages
  
• Simple Audio Power Meter
  
• Mini High-voltage Generator
  
• Programmable Servo Driver
  
• Simple USB AVR-ISP Compatible Programmer
  
• 123 Game – all MCU-free
  
• Cheap 12 V/230 V Invertor
  
• USB <-> RS-232 Cable
  
• Car & Motorcycle Battery Tester
  
• Mobile Phone Data Cable goes Interface Converter
  
• Intelligent Presence Simulator
  
• Low-Voltage Step-Down Converter
  
• LiPo Manager
  
• DCF77 Preamplifier
  
• Camera = Data Store
  
• RC Mains Sockets with Feedback
  
• Magnetic Flip-flop
  
• Indicator for Weller Soldering Stations
  
• Play the Guitar – Recycle Tip
  
• Automatic Range Switching
  
• Active Rectifier
  
• GPS Receiver
  
• ZigBee-based Wireless Motion Sensor
  
• Logic Goats
  
• Simple Capacitive Touch Sensor
  
• TV Muter
  
• Universal Thermostat
  
• DTMF-controlled Home Appliance Switcher
  
• USB-standby-killer
  
• Fog Lamp Switch
  
• 22-bit A/D Converters
  
• Solar-powered Battery Charger
  
• Simple LED Bike Light
  
• Solar-powered Uninterruptible PSU
  
• RGB Lights
  
• FM Microbug
  
• Energy-efficient Backlight
  
• SimpleProg
  
• Radio Control Signal Frame-rate Divider
  
• FL Twilight Switch
  
• The OC171 Mystery (solved)
  
• Pseudo-random Glitter
  
• Microlight Fuel Gauge
  
• PWM Control for Permanent Magnet Motors
  
• Five-output Video Distribution Amplifier
  
• Turbo BDM Lite ColdFire Interface
  
• Automatic S/PDIF Selector
  
• Phantom Supply for TV Antenna
  
• Mini Bench Supply
  
• Servo Control
  
• Software-defined Valve Radio
  
• Detector with Amplification
  
• Piezo-powered Lamp
  
• Digital Rev Counter for (Older) Diesels
  
• Golf Tally
  
• Solar Cell Array Charger with Regulator
  
• Assistance for BASCOM Programmers
  
• LED Spinning Top
  
• Cigarette-lighter Battery Charger
  
• AlphaSudoku
  
• Automatic car Battery Charger
  
• Auto-off for Audio Gear
  
• LED Switching Regulator
  
• Lighting Governor
  
• Solar lamp using the PR4403
  
• 12V Fan Directly on 230 V
  
• Outside Light Controller
  
• ISO Standard for Car Radios
  
• PR4401/02 off the Beaten Track