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Hobby Projects Part 1:      
Inverter Electronic Dazar
Telephone System Enhaned Alarm Keypad
Telephone Instrument Fluid Level Sensor
5-30 Min timer Isolated Telephone Interface
12Volts Stroboscope Live Wire Detector
Dark/Light Activited Relay IC 741 Opamp Projects
Digital Combination Lock IC 555 - Many small Projects
IC 555 Monostable

  

Other useful project links:  
Personal Network Analyzer Simple Metal Detector
2-250 MHz RF Network Analyzer PIC Desktop Thermometer