MAS.500
Problem Set 4
Due 10.16.12


Problem 1: Desolder the speaker from your doomsday board.

Problem 2:  Use the speaker from problem 1, and the CDS photocell, to make
 a light-theremin.  The frequency of sound coming out of the speaker should
 vary with how much light is on the sensor.  You can use either the Arduino,
 an op-amp, or both.  Build an amplifier to power the speaker.  You may want
 to use it with a resistor in series to back the volume down for testing.
 Bring your circuit to class to show it working.  Draw up a schematic of your
 circuit to be handed in.