Audio oscillator

Chapter 5.18 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

  • 274CHAPTER 5. DISCRETE SEMICONDUCTOR CIRCUITS5.18Audio oscillatorPARTS AND MATERIALS• Two 6-volt batteries• Three NPN transistors – models 2N2222 or 2N3403 recommended (Radio Shack catalog# 276-1617 is a package of fifteen NPN transistors ideal for this and other experiments)• Two 0.1 µF capacitors (Radio Shack catalog # 272-135 or equivalent)• One 1 MΩ resistor• Two 100 kΩ resistors• One 1 kΩ resistor• Assortment of resistor pairs, less than 100 kΩ (ex: two 10 kΩ, two 5 kΩ, two 1 kΩ)• One light-emitting diode (Radio Shack catalog # 276-026 or equivalent)• Audio detector with headphonesCROSS-REFERENCESLessons In Electric Circuits, Volume 3, chapter 4: ”Bipolar Junction Transistors”Lessons In Electric Circuits, Volume 4, chapter 10: ”Multivibrators”LEARNING OBJECTIVES• How to build an astable multivibrator circuit using discrete transistorsSCHEMATIC DIAGRAM0.1 µF0.1 µF100 kΩ100 kΩ6 V6 V1 kΩProbeILLUSTRATION