By Paul H. Dietz
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Extra info for A Pragmatic Introduction to the Art of Electrical Engineering
Please read the datasheet carefully. Not all of it will make sense, but you will most likely find it helpful. What’s Next? In the next chapter, we will be examining another technique for performing analogto-digital conversion. However, this new approach will use time varying circuits, including capacitors. This would be a good time to review first order differential equations! A Pragmatic Introduction to the Art of Electrical Engineering 47 CHAPTER 5 Timing is Everything The Problem As you might have noticed, we are starting to use up most of the I/O pins available on the Stamp.
What is an independent source and what is superposition? What is a digital to analog convertor? What is a Voltage Divider? The Stamp lives in a digital world of 5V or 0V. But what if you wanted to use the Stamp to generate voltages in-between? How do you go about this? In the previous chapter, we saw that a voltage drop occurs as current flows through a resistor, and that the magnitude of this voltage is given by Ohm’s Law. By adjusting the current, we change the voltage. We also saw that a resistor could be used in the LED circuit to help set the current.
Here, G = 1. This is often referred to as a unity gain buffer. You may have thought that there wasn’t much point to an amplifier with a gain of one, but if you examine the figure closely, you’ll notice that it has a dramatic effect. If the load resistor, Rl, had been placed across V1, a voltage divider would have A Pragmatic Introduction to the Art of Electrical Engineering 39 Guess the Number Rs Vs V1 GV1 Rl been formed, and the load would have seen only a fraction of the voltage Vs. With the buffer, the load is directly driven by the dependent source, bypassing the source impedance, Rs.