555 HYSTERETIC OSCILLATOR

Chapter 8.3 555 HYSTERETIC OSCILLATOR

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

Lessons In Electric Circuits Volume VI – Experiments Book

  • 370CHAPTER 8. 555 TIMER CIRCUITS8.3555 HYSTERETIC OSCILLATORPARTS AND MATERIALS• One 9V Battery• Battery Clip (Radio Shack catalog # 270-325)• Mini Hook Clips (soldered to Battery Clip, Radio Shack catalog # 270-372)• U1 - 555 timer IC (Radio Shack catalog # 276-1723)• D1 - Red light-emitting diode (Radio Shack catalog # 276-041 or equivalent)• D2 - Green light-emitting diode (Radio Shack catalog # 276-022 or equivalent)• R1,R2 - 1 KΩ 1/4W Resistors• R3 - 10 Ω 1/4W Resistor• R4 - 10 KΩ, 15-Turn Potentiometer (Radio Shack catalog # 271-343)• C1 - 1 µF Capacitor (Radio Shack catalog 272-1434 or equivalent)• C1 - 100 µF Capacitor (Radio Shack catalog 272-1028 or equivalent)CROSS-REFERENCESLessons In Electric CircuitsVolume 1, chapter 16: Voltage and current calculationsLessons In Electric Circuits, Volume 1, chapter 16: Solving for unknown timeLessons In Electric Circuits, Volume 4, chapter 10: MultivibratorsLessons in Electric Circuits, Volume 3, chapter 8: Positive FeedbackLEARNING OBJECTIVES• Learn how to use a Schmitt Trigger for a simple RC Oscillator• Learn a practical application for a RC time constant• Learn one of several 555 timer Astable Multivibrator ConfigurationsSCHEMATIC DIAGRAMHere is one way of drawing the schematic: