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MY FIRST BOOK ON CRYSTAL RADIOS - "VOICE OF THE CRYSTAL"
dx dan on 08/24/2011 at 10:19pm (UTC) | | | Here are some Things I've learned from the book "Voice Of The Crystal" by H. Peter Friedrichs. This is my very first book on the topic of crystal radios.
1. High Impedance headphones are very desirable when listening to crystal radios.
2. I liked this concept from the book and think it would help in learning how a radio is affected by the variations in components if you build them so they are interchangeable. - QUOTE from the book - "You will note that the projects in this book are not complete radios but components. This approach was taken on purpose. First, I wanted each part to stand on its own, for the sake of clarity. Each component is based on different principles, and each required its own consideration. As examples of creative thought, the components best serve this purpose as separate entities.
Second, I like the idea of separate "laboratory" style parts that can easily be mixed and matched to create various radio "hookups". If you stumble upon a favorite hookup, you can always replicate your lab components and assemble them as parts of a complete and permanent radio set.
3. Hz = Hertz = cycles per second
4. Amplitude = height of a wave
5. "We can build an electronic equivalent of a tuning fork by using two electrical components, a coil and condenser. Together, they form the basis of a circuit that will resonate at, or "ring" at a specific frequency. The coil / condenser combination creates what is called a tuned circuit."
6. There is a sympathetic energy transfer between matching tuning forks.
7. No energy transfer between mismatched forks.
8. Tuned circuits exhibit most of the same characteristics of tuning forks.
9. Tuned circuits (coil / condenser) can capture energy from passing electromagnetic waves, provided that the circuit is tuned to resonate at the same frequency as the waves that strike it.
10. Detector = Diode = Crystal
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