Elektor October 2003

Table of Contents Elektor October 2003

• DC-Operated Stepper Motors
  With unidirectional rotation and slow speed
• DDS RF Signal Generator
  Frequency range: 50 Hz to over 70 MHz
• Headphone Amplifiers
  DIY with valves and semiconductors
• Minimalist Induction-Balance Metal Detector
  A low-cost treasure hunter
• Precision Measurement Central (3)
  Flash for all purposes
• R-C Network Measurement with BASCOM AVR
  Better accuracy from a new command
• SuperCap Battery
  Power from a GoldCap
• The P89LPC900 (1)
  the architecture
• TinyLogic Ics Type NC7SZ57/58
  Configurable logic gates
• Valve headphone Amplifier
  EL84 (6BQ5) at an anode voltage of 40 V
• Valve Preamplifier (2)
  construction
• Valves at Low Voltages (2)
  more power!
• Xilinx PROM Programmer
  Parallel port serial PROM burner