Oscillator Foundations of Technology Oscillator © 2013 International Technology and Engineering Educators Association, STEM  Center for Teaching and Learning™

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  • Foundations of Technology

    Oscillator 2013 International Technology and Engineering Educators Association, STEMCenter for Teaching and Learning Foundations of Technology Teacher Resource Unit 4 Lesson 4

    2013 International Technology and Engineering Educators Association, STEMCenter for Teaching and Learning Foundations of Technology

  • Objective:You will build a simple circuit - two transistor audio oscillator that will generate an audio tone in a speaker.

  • You will need the following parts from your kit:Breadboard10 ohm resistor47 ohm resistor 120,000 ohm resistor0.1 uF (104) capacitorNPN transistorPNP transistor9 volt battery lead4 wires9 volt batterySpeaker

  • Use this schematic to construct the experiment. 47 Ohm+-9 volts120K Ohm10 Ohm39043906

  • Your circuit should like this one.

  • This circuit will make a sound. Using two transistors, it will generate a fixed frequency. By changing the 120K Ohm and/or the 47 Ohm resistor, it will cause the frequency to change.Changing the capacitor will also have an effect on the frequency.Do not change the 10 Ohm resistor as this is the only thing in place to protect the speaker.

  • Connect the 9 volt battery.Listen to the speaker.You should hear a tone about 500 Hz.Troubleshooting:Check the battery. Does it have voltage?Are there any breaks in the circuit?Are the transistors in the right way?

  • By completing this experiment, you should have heard a tone from the speaker. By changing the resistors or capacitors, the frequency from the speaker should have changed.In complete sentences, write what you learned about an oscillator.

    International Technology Education AssocSlide #*TITLE SLIDE12/01/2009STEMCenter for Teaching & Learning Engineering byDesign

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