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How to build Crystal Sets. This book first published in 1977, is still in print and has sold world wide since it was published. Hope and Allen Publishing hopes this E book will encourage new generations world wide to be engaged and amazed by a radio that works for free.
- Sales Rank: #393361 in eBooks
- Published on: 2015-11-27
- Released on: 2015-11-27
- Format: Kindle eBook
Most helpful customer reviews
3 of 3 people found the following review helpful.
It's Magic!
By B. L. OCONNOR
Back in the 1950s when I was a kid, my father bought me a Heathkit crystal set that I had to assemble myself. I enjoyed the assembly, but couldn't believe it would work because there was no power source: No batteries, no cord to a wall outlet, no transformer. You just strung one long piece of wire for an antenna and a second wire for a ground and you were done.
When I plugged in the earphones, I was mesmerized. It was magical! I could hear radio broadcasts! We lived in the San Francisco Bay Area then and I spent countless nights drifting off to sleep listening to the Giants baseball team.
Since my retirement, I've rekindled my interest in crystal radios and this book has made the magic reappear for me: I've used it over the past several years to build several crystal sets, each special in its own way. And every time I look at the book, I refine my understanding just a little bit more.
I need to make several additional points:
1) The title (Radios That Work For Free) is a clever description of the final product: once you've completed one of the crystal sets, they work for free. That is, they capture energy from the radio waves that are all around us and use that energy to create an audible signal. As I say, no power other than the waves themselves. How cool is that?
2) The instructions are clear and, viewed simply as a set of recipes, the book stands as well worth the purchase. But Radios That Work for Free is much more: it explains in simple terms the conceptual underpinnings of what each part of the radio system does (AM transmitter, the radio waves it produces, the antenna, the coil, the capacitor, the diode and the earphones).
If you understand how each of these elements works, you will be well on your way to understanding the conceptual framework of radio receivers.
3) In the sense of 2) above, crystal radios are primitive. And by building one and listening to it you will become immersed in a kind of history that few experience.
Think about it: There was a time about a century ago when crystal sets were cutting-edge technology. The people who listened to sets of this kind were able to touch the future and wonder at the present. To me, there is a certain romance in experiencing the same kind of magic as our forebearers did: these sets are no less marvelous today than they were when they first appeared. Perhaps they are more impressive.
4) The book and its projects is a wonderful way to introduce youngsters to science. How many of us have had science projects that "almost/should have" worked but didn't quite? The crystal sets here will work if built as instructed. Period.
5) For a parent, the book and the instructions it provides a wonderful way to collaborate with a child in building something that will work. The memories for both child and parent will last a lifetime.
If you have any interest at all in basic science; if you want a project to enjoy with your child; if you want the thrill of experiencing a little magic first-hand; if you are an incurable romantic who wants to experience what the ancients of the early 20th C did — then buy the book.
5 of 6 people found the following review helpful.
Innoculated by a Diode
By Roger T. Yokubaitis
This review of “Radios that Work for Free” is a slam-dunk because, for anyone that does not already know, it is common knowledge by everyone in the hobby of building crystal radios that “Radios that Work for Free” is far and away the very best book ever published comprising the start-to-finish radio theory; circuit suggestions, explanations, and tricks; photographs, diagrams and lists; details and explanations of components; suggested, practical, construction projects; motivational excitement; and everything else one needs to know in order to build and operate a crystal radio set, and to well know just exactly how and why a crystal radio and many other radios work.
As a Boy Scout in the 1950s, I built and rebuilt crystal radios and fox-hole radios over 25 years before this book was published because, somewhere along the way, I had been inoculated by a diode, and I can assure you my crystal-radio experience would have had many fewer hard knocks had I had K. E. Edwards’ “Radios that Work for Free” in hand before I started. With the start in learning radio theory afforded by having built and rebuilt crystal radios, I later built tube and then transistor radios, and, in August 1976, passed the Federal Communication Commission license examination for the issuance to me of ham radio station license and operator callsign of WB5YJN, which I still have.
Nevertheless, I also noticed and bought “Radios that Work for Free” in the early 1980s, and one of my sons and I built the most simple crystal radio K. E. Edwards’ shows, on page 4, in “Radios that Work for Free.” That crystal radio worked great and, consequently, my son also had been inoculated by a diode. Next, he had to have a science fair project at his school and decided he would build the Third Crystal Set Project, detailed on page 108 of “Radios that Work for Free,” which happened to be a short-wave crystal radio! Yes, a short-wave crystal radio. I had never built a short-wave crystal radio and I explained to him that about all I could do would be to show up and help him grunt. He followed Chapter 17 in “Radios that Work for Free” and without any problem had a working short-wave crystal radio set that received the BBC, Radio Moscow, Radio Havana, the Voice of America, Radio Nederland, Deutsche Welle Radio, and others. You owe it to yourself to build this short wave crystal radio just for the fun of it and to keep it by your bed just for even more fun listening to it work for free.
Even if you mistakenly think the Internet has completely replaced radio, or even if you are an Extra Class ham-radio operator, or even if your hobby is collecting only original orchestral soundtrack movie music composed by giants the likes of John Williams, James Horner, Bill Conti, Elmer Bernstein, Maurice Jarre, and others, then do yourself a big favor, buy K. E. Edwards’ “Radios that Work for Free,” and build just the crystal radio set shown on page 4. I guarandamntee you that you too will be inoculated by a diode!
0 of 0 people found the following review helpful.
Another book that does a much better job explaining the theory and showing you how to ...
By Brian Wegener
This book will definitely show you how to make a crystal radio, but I thought it was light on explaining the theory. Another book that does a much better job explaining the theory and showing you how to build the components from scratch is The Voice of The Crystal by H. Peter Friedrichs. Buy that book instead. Cover and contents of Friedrichs' book are shown in photos.
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