SubSystem : P7 |
Task
Title:
Variable Tone Generator |
Name: |
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IP2,
P7, OP1 Modules |
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1, Place the IP2, P7 and OP1 modules onto the Bridge Power Base (see Fig 7.). Connect up the OnTrack module to hold these down. 2, Use four white leads to connect the P7 module to the 20K ohm Variable Resistor and the 100uF Capacitor. Be careful to connect the capacitor the correct way round as it is an electrolytic type. 3, Connect also OP1 to the Piezo Sounder with two white leads. 4, Stack two more white leads into the Piezo Sounder and join to the L.E.D. 5, Check your wiring is accurate and then connect the 9 volt power supply. |
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Testing and Investigating: Don't forget to write up your method and results afterwards. 1, Press the push switch on IP2 and the L.E.D. should start flashing. A click should also be produced by the Piezo Sounder. 2, Adjust the 20K ohm Variable Resistor to make the flash rate (frequency) vary. A tone or note should be produced when the frequency is at its highest. 3, Place the leads that are connected to the 100uF capacitor into the 10 uF capacitor above. What has happened to the frequency or tone? Repeat for the other capacitors too. Remember to press the switch on IP2 to operate P7. |
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Connecting up Further Circuits 4, With the 0.1uF capacitor connected, take the leads now from the variable resistor and place them into the L.D.R. sockets. Vary the light entering the sensor and listen to the pitch of the sound change. Does it get higher or lower as the light increases and why do you think this is happening?
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