1. Objective: 1.You will build a simple circuit - two transistor audio oscillator that will generate an audio tone in a speaker.

2. You will need the following parts from your kit: 1.Breadboard 2.10 ohm resistor 3.47 ohm resistor 4.120,000 ohm resistor 5.0.1 uF (104) capacitor 6.NPN transistor 7.PNP transistor 8.9 volt battery lead 9.4 wires 10.9 volt battery 11.Speaker

3. Use this schematic to construct the experiment. 47 Ohm + - 9 volts 120K Ohm 10 Ohm

4. Your circuit should like this one.

5. 1.Connect the 9 volt battery. 2.Listen to the speaker. 3.You should hear a tone about 500 Hz. 4.Do not change the 10 Ohm resistor as this is only in place to protect the speaker. 5.Change the 120K Ohm and/or the 47 Ohm resistor, Try a few different values, how great of a variation in sound can you produce? Troubleshooting: 1.Check the battery. Does it have voltage? 2.Are there any breaks in the circuit? 3.Are the transistors in the right way?

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