🔔 Sound & Buzzer Projects (36–45)

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36. Buzzer ON/OFF circuit

37. Doorbell using buzzer

38. Continuity tester with buzzer

39. Water level alarm

40. Rain alarm

41. Fire alarm (LDR/heat demo)

42. Simple siren

43. Calling bell

44. Morse code buzzer

45. Reverse parking buzzer

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🔁 Switch & Control Projects (46–60)

46. Push button switch

47. Toggle switch demo

48. Touch switch (transistor)

49. Touch lamp (simple)

50. Automatic night light (LDR)

51. Clap switch (basic)

52. Relay ON/OFF demo

53. Motor ON/OFF switch

54. Fan regulator demo

55. Door switch light

56. Tilt switch alarm

57. Magnetic reed switch demo

58. Automatic stair light (basic)

59. Two-way switch demo

60. Emergency switch circuit