Electronics Projects For Dummies (For Dummies (Math & Science))

These projects are fun to build and fun to use


Make lights dance to music, play with radio remote control, or build your own metal detector

Who says the Science Fair has to end? If you love building gadgets, this book belongs on your radar. Here are complete directions for building ten cool creations that involve light, sound, or vibrations -- a weird microphone, remote control gizmos, talking toys, and more, with full parts and tools lists, safety guidelines, and wiring schematics.

Check out ten cool electronics projects, including
* Chapter 8 -- Surfing the Radio Waves (how to make your own radio)
* Chapter 9 -- Scary Pumpkins (crazy Halloween decorations that have sound, light, and movement)
* Chapter 12 -- Hitting Paydirt with an Electronic Metal Detector (a project that can pay for itself)

Discover how to
* Handle electronic components safely
* Read a circuit diagram
* Troubleshoot circuits with a multimeter
* Build light-activated gadgets
* Set up a motion detector
* Transform electromagnetic waves into sound

Companion Web site
* Go to www.dummies.com/go/electronicsprojectsfd
* Explore new projects with other electronics hobbyists
* Find additional information and project opportunities

Customer Review: Not dumb enough for me

I am still searching for a book for REAL Dummies.. people who have never wired a circuit and who are still struggling with First grade concepts like "what is a volt, what is an ampere? How do I wire up one LED so that it will light up? Is it positive to negative or the other way round?"



This book is not really for that kind of dummy. It starts you off with a project that involves about 50 resistors, integrated circuits, etc. It should not be called 'for dummies', but simply "simple projects for home hobbyists."



Having learned to wire my single LED (from relatives and the internet), and thus discovering what resistors are all about, I want to build an equally simple circuit to discover what a Capacitor is all about.

I am still looking for the first grade primer that will guide me in these basic learning exercises, but this book isn't it.

Customer Review: Electronics Projects For Dummies

This book offers no significant understanding of electronics or of the components used in it. Rather than encroach on the sales of his co-authored book Electronics For Dummies, Boysen simplifies his book of Electronic Projects to the point of incoherence. There is some explanation of what a component is doing in the circuit, but the explanations are very brief, and there is no background understanding provided for comprehending the significance of the explanation.



There is no discussion of current flow (negative to positive vs positive to negative) and of how current flow determines where in a circuit a component is placed. There is only a brief discussion on how to read and interpret a schematic, the discussion being on the meaning of the symbols. The authors spend more time telling you how to use a soldering iron than how to understand what it is you're actually doing when you replicate the schematic on the breadboard. As they describe step-by-step (along with photos) how to layout and wire the breadboard, they do not associate the procedure back to the schematic. Never do they say anything such as: "Now here in the schematic we see x occurring, and so on our breadboard we do y."



They very briefly explain how a breadboard itself is pre-wired but do not refer back to that explanation during the initial projects to clarify what it is they're doing. A study of the second project, a parabolic microphone, a less detailed project than the first, allows an easy comparison between schematic and completed breadboard and will clear up any confusion for the reader - no thanks to the authors. This completed breadboard is shown early in the book, with components labeled, as an example of what a completed board looks like, and shown again in the chapter on its project. But they don't take the trouble to be helpful to beginners and mention the IC is oriented top to the left. But then, the only help they're really giving anyway is telling you what to do, not why you do it.



There are no design tips, such as: "If you want a circuit that does x then these are the electrical conditions under which x would occur and this is how you might go about designing a circuit to make x occur." They don't explain how they went about designing the various circuits in their projects. Nor is there is any mention of any useful conventions or possible mistakes in drafting a schematic. When a sub-circuit (potentiometer/IC amp/speaker) is literally duplicated from one project to another, they don't point that out. This modularity is significant and they see no reason to mention it.



An advantage of the book, I suppose, is that you don't have to understand electronics to follow the step-by-step instructions for building the projects in it. Just skip the explanation of the schematic, which is only marginally helpful anyway, and connect the dots the way they show. Another analogy is painting by numbers. This color goes here, here and here, and this other color goes right there and nowhere else. You might learn how to paint that way, but it's a pretty mindless way to teach it.



There is a glossary but it is elementary. The entry for current is: "The flow of an electrical charge", with no mention of Ohm's Law, which the authors stated on page 19. If you look up Ohm's Law in the glossary you read: "The equation that you use to calculate voltage, current, and resistance, or power", with no reference to what the law says or where it is given in the book.



There are 10 projects. The first project results in LED lights that react to high or low frequencies of sound, so you get a blinking light show. That's followed by a parabolic microphone, then a circuit designed around a programmable IC sound chip that's activated by pressure switches which they put in a doll. Finally at project 4 you get to see the schematic for an AM radio, the first project that interested me, but since most of the electronics for it is on an integrated circuit, there isn't much to learn from this project.



Next we get two plastic pumpkins, one of which transmits an infrared beam to the other. When the beam is broken, the other pumpkin is activated to speak or play a recorded sound. This has applications outside of pumpkins, for an alarm system, of course. So this project has some appeal.



Project 6 involves timing a collection of LEDs to create a sequence of images, which they call Dancing Dolphins. Next they control a little 3-wheeled go-kart via infrared, which involves an infrared receiver and transmitter like in the pumpkins, although in this case the transmitter is a remote control for the electric motor in the go-kart.



After that you get a metal detector with a maximum sensitivity range of about an inch, then a project called Sensitive Sam, which involves a motorized cart that can follow, via sensors, a track on the floor created by black electrical tape, as long as the floor is otherwise shiny or reflective. With a radio wave remote you build you can control the cart's speed, honk its horn or turn it off.



The last project, which should have been one of the first, is a small box that detects its own motion off the horizontal via a tilt switch, which activates a sound chip. It contains a microphone for recording into the sound chip. This project does not require a computer to get your voice into the chip. It uses the same chip used in the talking pumpkin. In fact, the schematic for this is a slight simplification or variation of that for the pumpkin that receives the infrared beam. The authors do not mention this similarity, and because the schematics have to accommodate the few differences in the components they require, they are not drawn so that they mirror the similarities between them.



They're of little help in gathering the components for the projects. An appendix with a comparative chart of the components used in the book would have been helpful. They list what you need within a project's chapter, such as "100 microfarad electrolytic capacitor", which does tell you what you need in this case, if you can figure out how to find that in the huge electronics catalogs online, but there's no general suggestions about capacitors and resistors for future projects using AA batteries or other low voltage projects. If you want to buy in bulk they don't point you in the right direction: "Get a bunch of these, and these, and a lesser amount of these, and you'll probably appreciate a wide assortment of these, and you won't need any of these for a while but you might as well get one or two of these." They're no help whatsoever in choosing a multimeter: what features would be useful to a hobbyist and which are superfluous.



If you want merely to learn how to assemble some simple circuits and don't mind not learning any electronics along the way, and you like the projects the book offers, then this book can suffice. In the final chapters, the authors give helpful suggestions of where to go next. Among their suggestions the only two books they recommend are: Electronics For Dummies by Gordon McComb and Earl Boysen, and The Art of Electronics by Paul Horiwitz and Winfield Hill. I think I'll pass on the Dummy book.


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