project you can find...



  • Project 1. A simple melody player
  • Project 2. Melody player using a speaker
  • Project 3. Musical call bell 18
  • Project 4. Musical hold-on for telephone
  • Project 5. Timer with musical alarm
  • Project 6.Intercom with musical ringtone
  • Project 7. Soft musical telephone ringer
  • Project 8. Touch-sensitive musical bell with delay
  • Project 9. Musical continuity tester
  • Project 10. A set-reset (bi-stable) flip-flop
  • Project 11. Touch sensitive alarm
  • Project 12. On/off ringer
  • Project 13. Toilet �busy� indicator
  • Project 14. Electronic direction pointer
  • Project 15. Simple soil moisture level controller
  • Project 16. Touch-sensitive single-chip flasher-cum-beeper
  • Project 17. Automatic water pump controller
  • Project 18. Generating three tones using a single digital IC
  • Project 19. Divide-by-N counter using CD4033
    • Project 19A. Divide-by-2 through 6 and 8
    • Project 19B. Divide-by-7 counter
    • Project 19C. Divide-by-9 counter

  • Project 20. Divide-By-N counter realisation using 555, CD4033 and CD4017
  • Project 21. Telephone call counter
  • Project 22. Mains interruption counter with indicator
  • Project 23. Timer for students
  • Project 24. DICE with 7-segment display
  • Project 25. Simple smoke alarm
  • Project 26. Concealed AC mains line detector.
  • Project 27. Speed control of DC motor using pulse-width modulation
  • Project 28. IR to RF converter
  • Project 29. Contactless telephone ringer
  • Project 30. Preamplifier (signal booster) for FM band
  • Project 31. Condenser mike amplifier.
  • Project 32. Cordless FM mike
  • Project 33. Laser controlled on/off switch
  • Project 34. Phone broadcaster
  • Project 35. Anti-theft alarm
  • Project 36. Touch dimmer
  • Project 37. Doorbell using UM3561
  • Project 38. Line-powered two-tone ringer
  • Project 39. Ding-dong bell
  • Project 40. Rechargeable white LED torch