555 audio oscillator

Chapter 6.7 555 audio oscillator

Lessons In Electric Circuits Volume VI – Experiments Book
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Summary of Contents

Lessons In Electric Circuits Volume VI – Experiments Book

  • 6.7. 555 AUDIO OSCILLATOR3116.7555 audio oscillatorPARTS AND MATERIALS• Two 6 volt batteries• One capacitor, 0.1 µF, non-polarized (Radio Shack catalog # 272-135)• One 555 timer IC (Radio Shack catalog # 276-1723)• Two light-emitting diodes (Radio Shack catalog # 276-026 or equivalent)• One 1 MΩ resistor• One 100 kΩ resistor• Two 510 Ω resistors• Audio detector with headphones• Oscilloscope (recommended, but not necessary)A oscilloscope would be useful in analyzing the waveforms produced by this circuit, but itis not essential. An audio detector is a very useful piece of test equipment for this experiment,especially if you don’t have an oscilloscope.CROSS-REFERENCESLessons In Electric Circuits, Volume 4, chapter 10: ”Multivibrators”LEARNING OBJECTIVES• How to use the 555 timer as an astable multivibrator• Working knowledge of duty cycleSCHEMATIC DIAGRAM555DischThreshTrigGndVccRSTOutCtrl6 V6 V0.1 µF1 MΩ100 kΩ510 Ω510 Ω