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 Amateur Radio Station Circuits:   
Construction of Air Coils 50 Ohms Dummy Load
AC Volt Meter CW Audio Filter
Digital Volt Meter Morse Code Practice Keyer
Electronic Keyer Multi-vibrator
Build a SWR Bridge Panel Meters
Build a Field Strength Meter TVI Filter for your Ham Station
Testing MOS FET's Testing UJT's
Make a function generator Voltage Probe


Other useful project links: 
PIC frequency meter
Multimeter with SB (Sound Card)