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Diode Radio Circuits
Need information about an FM Radio Transmitter?
Hello,
I am doing a project to create a FM radio transmitter, the link below shows the circuit. I want to know what effect does each of the component have on the radio transmission and how it works? so what effects do the varactor diode, buffer ampifiers, inductors, capacitors, oscillators(tapped and voltage-controlled) all have on the transmission of the radio signals?
link to circuit:
http://www.flickr.com/photos/24949707@N07/3768687696/
Thanks
I think you are asking someone to write a textbook of electronics for you. Is that not a little optimistic? I suggest you find a bookshop and choose a book that suits you.
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Radio Communications: Systems and Circuits $29.85 A perfect study companion for the electronics and engineering student curricula. This book contains some of the most classic examples of the electronic circuits commonly used in the communications industry. The information contained concentrates more on the practical rather than the theoretical and includes guidelines on methods for evaluating circuit performance and sheds light on means of avoiding future reliability problems during the life of the product. Author: Rorick, William Binding Type: Paperback Number of Pages: 52 Publication Date: 2008/02/11 Language: English Dimensions: 5.98 x 9.01 x 0.12 inches |
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Diode Lasers and Photonic Integrated Circuits $15 No Synopsis Available |
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Radio Communications : Systems and Circuits $19.45 No Synopsis Available |
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Integrated Circuits in Radio Astronomy $74.1 No Synopsis Available |
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Snap Circuits FM Radio by Elenco Electronics $21.5 The Elenco Snap Circuits Mini FM Radio features brightly-colored electronic components that snap into a clear plastic base to build different circuits. With this kit you can build a working FM radio that automatically scans for stations. This kit includes 3 additional projects: power amplifier electronic kazoo and trombone. It requires 3 AA batteries. It comes out with colorful and easy instruction sheet to follow that make these electronic experiments effortless and fun to use. Gender: Unisex Age: Child |
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Diode Lasers and Photonic Integrated Circuits, 2nd Edition $131.63 No Synopsis Available |
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Radio-Frequency Electronics : Circuits and Applications $90.77 No Synopsis Available |
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Radio Frequency Integrated Circuits And Technologies $106.28 No Synopsis Available |
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Radio Frequency Integrated Circuits and Technologies $106.28 No Synopsis Available |
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Advanced Ac Circuits and Electronics $334.39 From the moment they open Advanced AC Electronics: Principles and Applications, readers will become actively involved in learning how to apply AC circuit techniques to electronics circuits that are interesting and actually do something useful! Rather than presenting AC electronics as a series of seemingly magical rules and incantations, this book integrates AC circuit theory tools with electronics, interweaves topics as needed, and introduces the use of circuit analysis tools on a just-in-time basis to support development of electronics circuits. It engages readers in applying circuit theory to a wide variety of passive and active electronics that respond to a sinusoidal signal with both a change in magnitude and a shift in the sine wave's phase. Immediately upon introduction, each technique is applied to a host of examples, including: commercial electrical power production and distribution, industrial motor performance and control, audio systems, instrumentation, radio frequency, and communications circuits. Motors, rf and audio cables, loudspeakers, thyristors, transition and op amp amplifiers are also introduced early on, capturing attention while guiding readers in their examination of real-world responses to sinusoids. Level and rigor make Advanced AC Electronics an ideal choice for programs accredited by the Accreditation Board for Engineering and Technology (ABET). |
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Circuits and Systems for Wireless Communications $412.62 This book contains revised contributions by the speakers of the 1st IEEE Workshop on Wireless Communication Circuits and Systems, held in Lucerne, Switzerland, from June 2224, 1998. The aim of the workshop was to demonstrate the vast expertise of the CAS Society in the area of circuit and system design to the rapidly growing field of wireless communications. The workshop combined presentations by invited experts from academia and industry with panel and informal discussions. The following topics were covered: RF System Integration (singlechip systems, CMOS RF circuits), RF FrontEnd Circuits (CMOS RF oscillators, broadband design techniques), Wideband Conversion for Software Radio (A/D conversion issues, wideband subsampling, lowspurious A/D conversion), Process Technologies for Future RF Systems (Si, SiGe, GaAs, CMOS, packaging technologies), DSP for Wireless Communications (DSP algorithms, fixedpoint systems, DSP for baseband applications), Blind Channel Equalization (adaptive interference suppression, design techniques, channel estimation).A carefully selected combination of tutoriallike papers as well as papers on specialized and advanced topics is included. Thus, newcomers to the field of wireless communications will benefit from the overview of emerging technologies in circuits and systems, and specialists will benefit from the thoughtprovoking details presented in this book. Author: Helfenstein, Markus/ Helfenstein, Markus/ Moschytz, George S. Binding Type: Hardcover Number of Pages: 404 Publication Date: 1999/11/30 Language: English Dimensions: 9.72 x 6.50 x 1.09 inches |
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Radio Frequency Integrated Circuits and Technologies By Ellinger, Frank $146.24 Author: Ellinger, Frank Publication Date: 2008/09/01 Number of Pages: 516 Binding Type: Hardcover Language: English Depth: 0.75 Width: 6.00 Height: 9.00 |
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The Design of Cmos Radio-Frequency Integrated Circuits $18 No Synopsis Available |
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Spirit Radio With LSD (Light Sensitive Diode)
How could I keep the Radio in my truck from losing it's memory?
Alright, I drive a tractor trailer for a freight company. Of course, there are no radios in the truck. What we(drivers) do is build a box with speakers and a car radio mounted in it. There are bannana plugs on the dash to get power from. Now The only problem is that everytime you shut the truck down the radio will lose it's memmory (presets, Volume level, etc). I could get an analog radio but that is just out of the question. I was thinking more along the lines of a secondary power source. Like connecting a 9V battery connector to the memmory wire so when the truck is off it will still hold it's memmory. Seeing that the radio won't work without this wire being hooked up to the trucks power I would have to incorporate a diode of some sort so I don't fry the battery. What kind of diode should I use and Where should I put it in the circuit? I can't mess with the truck, so whatever I do has to be done in my radio box. Thanks for any info....
A 9V battery will hold the memory in your radio. A lot of people use that trick to keep their radio and their on-board car computer from losing its memory when they need to take out the car's battery for repair work. There is even a commercial product which is a 9V battery connected to a plug that fits a cigarette lighter, so its use is well known.
What you need to do is put the snap on connections for a 9V battery into your box across the power input wires (watching the polarity red/black wires). Now you can snap on a 9V battery on to keep the radio powered up. I don't believe you need the diode but it doesn't hurt to add one. Put it in series with one of the leads from the 9V battery so it would oppose the flow of truck power into the 9V battery. The arrow symbol on the diode should point toward the black wire (negative). You can use a low wattage diode since the current required to keep up the memory in the radio is very small.
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