DESIGN REVIEW MINUTES, 3/29/2000

-Overall design goal was introduced by Prof. Arnstein.
	-We want to use the uControllers to play music. 
	-Would like to be able to network the music players
	 and have them interact with each other.
	-Each music player will be identical, or at least should have 
	 similar features.

-Some questions came up about how to get started:
	-How do you get music out of a uC.
	-What speakers?
	-How do you hook up a speaker?

-Prof. Arnstein gave the basics of how a speaker works.
	-A permanent magnet surrounded by coils. 
	-When voltage is applied to the coil, it causes the magnet (or
	coils if the magnet is stationary) to move depending on voltage
	differential.
	-KEY IDEA: If we apply a fast enough square wave the speaker will 
	produce a nice tone similar as if it was driven by a pure sine 
	wave.

-So now how can we hook up the speaker?
	-We can think of the speaker just as a resistor like we did
	in the lab with the LED.
	-For implementation will need some kind of current-limiting
	circuitry.

-How can we play a chord?
	-Need to superposition multiple sources to the same speaker.
	-Can't simply wire sources together because it essentially shorts
	pins together.
	-Must use resistor in series with each source.

-Ideas and Questions from the class
	-Having multiple speakers on one music box.
	-Synchronizing music boxes:
		-How to do it?
		-Synchronized clocks?
		-A global "start" signal
	-Why can't we do the superposition in software and drive a single
	pin with the chord we want to play?