Elektor December 2002

Table of Contents Elektor December 2002

• USB Audio Codec with S/PDIF
  record digital audio with your PC
• Electrically Isolated Zero- Crossing Detector
  
• HT12E Pushbutton Switch Extension
  
• 1dB-Chebyshev Filter/Amplifier
  
• Long-Interval Timer
  
• Switch for Switch-Free Power Supplies
  
• Door Knocker Bell
  
• Modified Time Clock Switch
  
• Seconds Reference with Quartz Crystal
  
• Turn That Down, Please
  
• Infrared Wake-Up Circuit
  
• Automatic Battery Switchover
  
• Model Train Lighting
  
• Triple Voltage Monitor with "Power Good" Signal
  
• Mailbox Alarm
  
• Crystal Tester
  
• I2C over Long Distances
  
• Carnival Glasses
  
• Programmable Dial-Out BlockingDevice
  barring premium rate numbers
• VLF reception on the PC
  antenna on the soundcard
• Digital Radio Mondiale (DRM)
  digital long-, medium- and shortwave radio
• Noise Generator
  
• Valve Detector Receiver
  
• Low-Cost Reflex Interface
  
• Free Processors
  
• Door Opener de Luxe
  
• Titler for Portable MD Players
  
• 512-MB ROMBot
  
• 7-segment Display IC
  
• Switchable Current Source
  
• Luminescent Torch
  
• A Simple Switch for R/C Models
  
• Automatic Power-Off
  
• Real RS232 for Laptop PCs
  
• Video Sync Generator
  
• Fan Controller with Remote Temperature Sensor
  
• Infrared Light Switch
  
• 1 kHz to 30 MHz Oscillator using only Three Components
  
• Portable MD Remote Control Demystified
  
• Simple AVR Programmer
  
• Phantasia on a 555 Theme
  
• Manchester decoder
  
• RF Probe
  
• Random Flashing LED
  
• Window Comparator
  
• Magnetic Proximity Switch withToggle
  
• Super-Fast Comparator
  
• Compact Flash Interface for Microcontroller Systems
  including our 89S8252 Flash board
• Vehicle Diagnostics Adapter (2)
  Windows software for the OBD-2 interface
• IR Receiver for the I2C Bus
  
• Power Opamp with Programmable Output Current
  
• Bistable Relay
  
• Scanning Slides with an ELS
  
• Automatic Fidge Switch for Caravans
  
• Voltage Inverter with Cascade Stage
  
• DC Protection for the IGBT Power Amp
  
• Flashing Alarm Led
  
• Vibration Detector
  
• Current Source with Indicator
  
• Token Number Display
  
• Tea Timer
  
• DCI Bus
  RS485 home network with a maximum of 64 terminals
• Port Line and ADC Extension for 89S8252 Flash Micro E.
  using our Universal Interface for Windows
• Capacitance Meter
  using a CMOS timer
• A Star for Christmas