This book introduces in detail more than 100 kinds of practical electronic circuits in more than 20 categories used in daily life, including novel circuits such as alarm, lighting, remote control, telephone, charging, fan, power supply, energy saving, insect repellent, switch, etc. In addition to explaining the structural characteristics, production methods, component selection and other contents of the circuit, it also explains the debugging and maintenance of the circuit. This book can be used as a reference for readers. 1. Non-interference electric fan natural wind controller 2. Simulation of natural wind stepless speed control electric fan control circuit 3. One-way thyristor electric fan stepless speed control circuit 4. Touch-type 5-speed electric fan speed control circuit 5. Practical time-based electric fan simulation natural wind control circuit 6. Practical electric fan multifunctional program controller 7. Practical multifunctional electric fan remote control circuit 8. Dual-function electric fan remote control controller 9. High-reliability refrigerator protection circuit 10. Refrigerator power failure protection circuit 11. Refrigerator electronic deodorizer 12. Refrigerator door closing automatic language reminder 13. Air conditioner protection circuit 14. Rice cooker fire controller 1 5. Electronic circuit for air purification 16. Safety iron control circuit 17. Fully automatic igniter for gas stove 18. Simple and practical thyristor stepless dimmer 19. Practical stepless touch dimming lamp circuit 20. Magic rotating colored lamp circuit 21. Household colored slide circuit 22. Variable water lamp control circuit 23. Six-way circular colored lamp control circuit 24. Household karaoke lighting control circuit 25. Practical light-controlled energy-saving switch 26. Sound and light dual-control delayed lighting lamp 27. Light-controlled road construction flashing warning light control circuit 28. Radio coding remote control 4-level dimming lamp switch 29. Induction corridor lighting Switch 30. Infrared detection automatic switch 31. Power failure self-locking pull-wire switch 32. Light-controlled lighting automatic switch 33. Application of CCDD-1A special integrated circuit for color light control 34. Application of infrared integrated device SNS9201 in delay switch 35. 8-channel electronic switch circuit 36. A human body pyroelectric detection circuit 37. Speaker passive protection circuit 38. Gas leak alarm 39. Smoke and gas monitoring circuit 40. Sensitive and reliable flame extinguishing alarm circuit 41. Harmful gas leak alarm and automatic control circuit 42. Encoded car anti-theft alarm 43. Automatic reset 44. Simple and practical touch alarm 45. Novel and practical door lock alarm 46. Passive power failure alarm 47. Application of radar anti-theft detection device TWH9601 48. Household appliance leakage alarm 49. Two-way over-temperature alarm 50. New liquid level alarm integrated circuit 51. Inductive high-voltage voice alarm circuit 52. Novel voice alarm anti-theft alarm 53. Bag loss alarm composed of digital circuit 54. Multi-channel patrol voice broadcast system 55. Precious home appliance theft tracker 56. Child anti-lost device 57. Application of programmable password control circuit 58. Multifunctional computer password lock controller 59. Practical motorcycle wireless anti-theft alarm 60. High-security code-jumping encoding and decoding circuit 61. Dual-frequency digital security lock circuit 62. Digital infrared remote control anti-theft password lock 63. Novel password lock circuit 64. Fully automatic digital electric shower 65. Digital welcoming and seeing-off language doorbell 66. Change the color TV shutdown to completely power off remote control shutdown 67. Add a blue screen noise suppression circuit to ordinary color TV 68. Practical infrared color TV remote control 69. Practical light control and touch dual-purpose power socket 70. Multifunctional infrared remote control system circuit 71. Infrared remote control Pressure socket 72. Household ultrasonic remote control circuit 73. Infrared remote control switch receiving circuit 74. Practical logic level test circuit 75. Amplified bass metronome 76. Digital stereo balance control circuit 77. Digital control fast charging circuit 78. Novel and practical charging circuit 79. Lithium-ion battery charging control circuit 80. Contactless automatic charger 81. Mobile car charger 82. Nickel-cadmium battery capacity recovery circuit 83. Water level digital control circuit 84. Novel resistance accuracy screening circuit 85. Electronic bird repeller circuit 86. Electronic insect prevention and repellent circuit 87. Mosquito and fly killer electronic circuit 88. High-efficiency electronic rodent killer for household use 89. Electronic rodent killer with visual function 90. Electronic cockroach killer circuit 91. Simple electronic hypnotist 92. Timing control circuit of electronic watch 93. Automatic time calibration circuit 94. Telephone anti-theft device 95. Practical telephone anti-theft device circuit 96. Telephone guard circuit 97. High-sensitivity wireless microphone 98. Automatic temperature control electric heating shoe circuit 99. Skin sunscreen circuit 100. Simple high-precision temperature measurement and control device 101. Power line carrier communication device 102. Add a delayed automatic power-off switch to an ordinary digital multimeter 103. Homemade micro FM transmitter circuit 10 4. Homemade wired telephone emergency intercom 105. Quick and convenient electronic tube detector circuit 106. Portable voltage stabilizer 107. Power-on self-reset safety power supply 108. L296 voltage stabilizer integrated circuit and its application 109. Application of new BTL power amplifier integrated circuit TDA7056A 110. LM1875 for precision DC servo motor drive circuit 111. 40W electronic energy-saving ballast circuit 112. 16W high-efficiency electronic energy-saving fluorescent desk lamp circuit 113. High-efficiency 7W electronic energy-saving fluorescent desk lamp circuit 114. Several practical circuits to extend the life of fluorescent tubes 115. Application of IR2155 integrated circuit in electronic ballast 116. Application of TL494 integrated controller for switching power supply 117. Typical application of TL1451 integrated circuit for switching power supply 118. Switching power supply circuit composed of UC3842 pulse width modulator 119. Switching power supply composed of UC1864 integrated circuit controller 120. Practical circuit of IBM-PC microcomputer switching power supply 121. Switching power supply circuit of Casper display 122. Practical circuit of switching power supply of LQ-1600 printer 123. Driver interface circuit of transistor output type photocoupler and CPU 124. Driver interface circuit of thyristor output type photocoupler and CPU 125. Main references of several thyristor trigger circuits
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