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By Paul H. Dietz

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Hearing, like most human senses, is inherently logarithmic. For example, the just noticeable increases in volume from a given level increase proportionally with the A Pragmatic Introduction to the Art of Electrical Engineering 45 Guess the Number volume level. ) So, without further ado, here’s the big picture: 5V 10kΩ pot Vout 5V +9V 1/4 LMC660 DAC 1N4007 amp 1kΩ 1N4007 5V 3 10kΩ Stamp The idea here is that you will use the Stamp to choose DAC outputs. These will be amplified up to give the appropriate comparison voltages.

The receiver sees this start bit, and starts to look for data at specified times after it. In this chapter, we will be using a National Semiconductor MM5484 16-segment LED display driver. (Unfortunately, National recently obsoleted this part, so you may or may not be able to find it. ) This chip receives serial data using a special protocol, and appropriately drives 16 output pins. These outputs each look like switches to ground which can be turned on or off. Once data is received, the switches stay in that state until new data has been received.

This is called a Thevenin equivalent circuit. RT VT To prove this, let’s find the I-V curve produced using this circuit. The test setup is shown below. A test voltage is forced across the two terminals in question, and the current is measured. The current through the resistor will be: V test – V T I test = ---------------------RT Plotting Vtest versus Itest gives the I-V curve shown here. A Pragmatic Introduction to the Art of Electrical Engineering 35 Guess the Number I test RT Vtest VT I test -I sc slope = 1/RT VT = Voc Vtest In fact, we could have found this line even more easily.

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