Projetos de Circuitos Eletrônicos para Diversas Aplicações de Áudio

1. 1.5V Audio Amplifier
2. 3 Transistor Audio Amp (50 milliwatt)
3. 3-Band equalizer
4. 555 Tone Generator (8 Ohm Speaker)
5. 6-Input mixer
6. Active Sub-Woofer and Controller
7. Amplified ear
8. Amplifier thermal protection
9. Amplifier timer
10. Analog VU meter
11. Audio frequency meter
12. Audio graphic equaliser
13. Audio level indicator
14. Audio line isolator
15. Audio mixer
16. Audio notch filer
17. Audio Signal Source
18. Automatic Charger for Battery Operated Hi-Fi Preamps
19. Automatic gain control (AGC) circuits
20. Balanced Line Driver & Receiver
21. Bell ring generator
22. Bias circuits
23. Bridging Adapter For Power Amplifiers
24. Bull Horn
25. CMOS IC audio oscillator
26. Code practice oscillator
27. Condenser microphone hookup
28. Digital Delay Unit For Surround Sound
29. Digital noise generator (PDF)
30. Digital volume control
31. Direct Injection Box for Recording & PA Systems
32. Doorphone intercom
33. Dual Voltage Controlled Filter w/Modulator
34. Dual Voltage Controlled Oscillator w/Modulator
35. Dynamic microphone to electret microphone input
36. Electret microphone powering circuits
37. Electronic canary
38. Electronic siren
39. Electronic siren
40. Electronic whistle
41. Fast Audio Peak Limiter
42. FET audio mixer
43. High Quality Sound Mixer
44. Improved PL tone decoder
45. Intercom preamp
46. Line level signal to microphone input adapter
47. Linkwitz Cosine Burst Generator
48. LM358 preamp
49. Load Sensing Automatic Switch
50. Loudspeaker Protection and Muting
51. Low Frequency Sinewave Generator
52. Low Noise Balanced Microphone Preamp
53. Low Noise Microphone Preamplifier
54. Low Power Op-Amp - Audio Amp (Intercom)
55. Magnetic cartridge amplifier
56. Microphone mixer
57. Microphone phantom power supply
58. Minimalist Discrete Hi-Fi Preamp
59. MS Stereo Decoder
60. MS Stereo Microphone
61. Noise generator
62. Paradoxical Sound Syntheizer
63. Parametric And Sub-Woofer Equaliser
64. Peak reading audio level meter
65. Phase shifter
66. Phono Preamps For All
67. Power Amplifier Clipping Indicator
68. Precision audio millivoltmeter
69. RIAA Equalized Stereo Phono Preamp
70. Room noise detector
71. Signal Detecting Auto Power-On Unit
72. Simple amplifier
73. Simple Surround Sound Decoder
74. Simple two line output combiner
75. Simplest Ever Amplifier Bridging
76. Sine wave generator
77. Six-channel Mixer and Amplifier
78. Sound detector
79. Sound level meter
80. Sound Mixer/Amplifier
81. Speaker Microphone Circuit
82. Speaker signals to line level inputs
83. Spring reverb unit
84. Stereo Ducker
85. Stereo line driver
86. Stereo Width Controllers
87. Subwoofer Equaliser
88. Surround Sound Decoder Mk2
89. Three band Active Tone Control
90. Tone control
91. Tone control
92. Tone detector
93. Tone display system
94. Tone generator
95. Tube active crossover
96. Tube amplifier
97. Twin-T Audio Sine Wave Oscillator
98. Two-tone siren
99. Underwater microphone
100. Use amplifier phono input as line level input
101. Variable Amplifier Impedance
102. Various tube crossover circuits
103. Very loud beeper (PDF)
104. Voltage controlled amplifier
105. Voltage Controlled Mixer w/Modulator
106. Voltage Controlled Panner
107. VU And PPM Audio Metering
108. Warbler