By AnnMarie Thomas
It is a e-book for folks and different educators—both formal and casual, who're interested in the intersections of studying and making. via tales, study, and knowledge, it builds the case for why it can be crucial to motivate today’s adolescence to be makers—to see the area as whatever they're actively assisting to create. if you happen to are new to the Maker stream, a few background and advent is given in addition to sensible recommendation for buying youngsters begun in making. in case you are already acquainted with the Maker flow, this e-book offers biographical information regarding a few of the “big names” and unsung heroes of the Maker flow whereas additionally highlighting a few of the attributes that make this a move that such a lot of individuals are keen about.
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Additional info for Making Makers: Kids, Tools, and the Future of Innovation
Example text
Fortunately for our purposes, logic chips, microcontrollers, and other digital devices have a high input impedance, so we can attach them directly to the phototransistor emitter—so long as we use an appropriate power supply, which will usually be 5VDC. If you drive the input of a digital chip with the output from an analog device (such as a transistor or phototransistor), you should always be careful to measure the actual voltage going into the chip under all conditions that may exist in the future, to make sure that the voltage stays in an acceptable range.
If any of these reminders is unclear to you, please go back to Make: Electronics, or another introductory book, or a manufacturer’s datasheet, for clarification. Figure 4-8. A graphical representation of “on” and “off” durations in a 555 timer (using a 5VDC power supply) running in astable mode, showing why the total time from the beginning of one cycle to the beginning of the next is proportionate to R1 + R2 + R2. Large capacitors Very high capacitor values (above, say, 470µF) are likely to produce unreliable results, because of leakage.
Quick Facts About Voltage So far I have made some assumptions without justifying them. I have assumed: • The positive voltage in a circuit is a fixed quantity. • All the points in a circuit wired directly to the negative side of the power supply have a potential of 0 volts. • Simple arithmetic defines the behavior of a voltage divider. • We can measure volts or milliamps anywhere we like, without disturbing the circuit. Figure 2-11. The consequences of more current (upper schematic) and less current (lower schematic) flowing through the base of an NPN transistor.