Skip to Main Content
Make: More Electronics
book

Make: More Electronics

by Charles Platt
April 2014
Beginner to intermediate content levelBeginner to intermediate
392 pages
14h 57m
English
Make: Community
Content preview from Make: More Electronics

Chapter 3. Experiment 3: From Light to Sound

In this experiment you’ll get acquainted with a phototransistor. Its symbol is shown in Figure 3-1, looking very much like a bipolar NPN transistor. In fact, its collector and emitter serve the same functions. The big difference is that the base is energized by incoming light, indicated by one or two arrows pointing toward it.

Sometimes the circle around the symbol is omitted. Sometimes there may be a single zigzag arrow instead of two straight arrows. These variations don’t indicate any difference in operation. However, if a connection is shown protruding from the base, a base connection is available to supplement the effect created by the incoming light. I’m just mentioning this so that you’ll recognize ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Make: Electronics

Make: Electronics

Charles Platt
Easy Electronics

Easy Electronics

Charles Platt

Publisher Resources

ISBN: 9781449344030Errata PagePurchase book