Author: Newton C. Braga

Published: Aug, 2016

Formato: Book and e-Book

Pages: 226



Some years ago I had written a book directed to anyone who designs electronic and electric circuits. Engineers, technicians, teachers, students and hobbyists took a real benefit from that book. The original book is now out of print, being available only used issues. Since the book is very useful, the author decided to review the old edition, add new content and so create a new book for anyone who need a fast access to formulas, tables and calculations when designing his projects or solving a problem.

The author, who has himself designed multitudes of projects and circuits during his life, publishing many books and hundreds of articles in electronics magazines and teaching electronics, has collected an assortment of all basic information necessary for calculations needed when designing new projects or solving a problem.

More part of these formulas and calculations is now in the author´s site at The site also has versions in Portuguese ( and in Spanish (

In the site the reader will also find practical examples in projects or articles where many of the formulas shown in this book are used.

When starting a project or solving a problem the main difficulty the designer or student founds is how to locate the desired information. This information is normally spread over a large number of resources, such as books, handbooks, Internet, and magazine articles.

Although many of us who are experienced in electronics have in mind the principal formulas, we sometimes have trouble with the forgotten constant, multiplication factor or exponent. Finding these values is sometimes difficult depending of the circumstances, such as where you are at the time, or the amount of resources at your disposal.

Part 1 - DC Formulas

1. Units

2. Resistance of a conductor

3. Conductance

4. Conductance of a Length of Wire

5. Thermal Influence in the Resistance of a Cable

6. Ohm´s Law

7. Electric Power

8. Joule´s Law

9. Electric Energy

10. Electrolysis (Faraday´s Law)

11. Resistors in Series

12. Resistors in Parallel

13. Voltage Divider (resistive)

14. Loaded Voltage Divider (resistive)

15. First Kirchhoff´s Law

16. Second Kirchhoff´s Law

17. Capacitance

18. Planar Capacitor

19. Breakdown Voltage in a Capacitor

20. Energy Stored in a Capacitor

21. Capacitors in Parallel

22. Capacitors in Series

23. Magnetic Field of a Solenoid

24. Magnetic Induction inside a Solenoid

25. Inductance

26. Inductances in series

27. Inductances in Parallel

28. Mutual Inductance

Part 2 - AC Formulas


29. Frequency and Period

30. Cyclic or Angular Frequency

31. Average Value

32. RMS Value

33. Frequency & Wavelength

34. Capacitive Reatance

35. Inductive Reactance

36. Quality Factor (Factor-Q)

37. Ohm´s Law for AC Circuits

38. RL in Series

39. RC in Series

40. LC in Series

41. RLC in Series

42. RC in Parallel

43. LR in Parallel

44. LC in Parallel

45. Ressonance

46. Time Constant (RC Circuit)

47. Time Constant (LC)

48. Inductive Coupling Using Transformers

49. Direct Inductive Coupling

50. Ohmic Coupling

51. Capacitive Coupling

52. Low- Pass Filters

53. High Pass Filters

54. Band-Pass Filters

55. Differentiation

56. Integration

57. Noise

58. Bandwidth

59. Voltage Ratio in Transformers

60. Current Ratio in Transformers

61. Impedance Ratio in Transformers

62. Decibel

63. The Neper

64. Balanced T-Attenuator

65. Balanced π-Attenuator

66. Unbalanced T-Attenuator

67. Unbalanced π-Attenuator

68. Half-Wave Dipole

69. Folded Half-Wave Dipole

70. Range (VHF and upper signals)

71. Coaxial Cable

72. Two-Wire Balanced Line

73. Impedance Match or π-Network



Part 3 - Electronic Circuits

74. Semiconductor Diode

75. Half-Wave Rectifier

76. Full-Wave Rectifier

77. LC Filter Coefficient

78. RC Filter Coefficient

79. Ripple Factor

80. Filter Inductance

81. Filter Capacitance

82. Conventional Voltage Doubler

83. Cascade Voltage Doubler

84. Bridge Voltage Doubler

85. Full Wave Tripler

86. Cascade Voltage Tripler

87. Full-Wave Voltage Quadrupler

88. Zener Diode

89. Capacitive Voltage Divider

90. NTC

91. PTC





93. Transistor Static Current-Gain (Common Emitter)

94. Transistor Static Current Gain (Common Base Configuration)

95. Relationship between Alpha and Beta

96. Hybrid Parameters

97. Common Base

98. Common Emitter

99. Common Collector



Part 5 - Basic Quantities of Circuits Using Transistores

100. Short-Circuit Output

101. Open Circuit Output

102. Short-Circuit Input

103. Open-Circuit Input

104. Common-Base Configuration Usual Formulas

105. Common-Emitter Configurations Usual Formulas

106. Common Collector Usual Formulas





108. Base- Biasing Resistance

109. Automatic-Biasing Resistance




110. Common Source

111 – Common Drain

112. Common Gate

113. UJT – Unujunction Transistor

114. SCR

115. TRIAC




116. Astable Multivibrator

117. Neon-Lamp Oscillator

118. Phase Shift Oscillator

119. Wien Bridge Oscillator

120. Twin-T Oscillator

121. Hartley Oscillator

122. Colpitts Oscillator

123. CMOS Two-Gate Oscillator (I)

124. CMOS Two-Gate Oscillator (II)

125. CMOS Schmitt Tri

... and More


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