How to Create a Simple AM Radio

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How to Create a Simple AM Radio Powered By Docstoc
					                   How to Create a Simple AM Radio

  AM radios are very easy and cheap to make and this one goes together in a very few
  parts. The circuit described below is for all living within 5O kilometers of the station.


2. AM radio is complete, we need five basic parts:
3. Antennas, electromagnetic waves are received and converted back to electrical signals
4. Tuner, we want to sort out the correct carrier frequency, a radio station that we are
ready to listen
5. Detector (diode), but the low frequency mind to get rid of high frequency signal
6. , Amplifier with signs
7. Speaker, producing a sound that we hear
8. Here are the details of the individual parts are as follows:
9.The antenna: an antenna, all we need is a long piece of wire. Ideally, this should be too
long (about 50 feet), but the short is something we will work quite well. We antenna line
wound around a piece of wire with a plastic tubing together. Below is a picture that is
almost exactly what you are going to like this show. This coil is about 3 inches high and
1.5 inches in dia.
Tuner: The tuner function to choose what we want to listen to the radio. Each radio
station broadcasting carrier frequency range. Our tuner wire loop (called inducer) and the
use of capacitors. Inductor and capacitor combination of "ready" is something - a cycle
that is thrown away all unwanted signals, and we want to keep only one. Resonator
resonates (obviously. ..) particular version of the stimulus measures ("inductance",
including "henries" is measured) and the capacitor is determined by the size
("capacitance" in its measured) "farad". Tuner is designed for power and motive power
capacitor little figure below shows the symbol. Thin insulation on the red wire coil tuner
and a 200 rotation. Ceiling insulation to combat it. Radio tuned, we use a copper strip coil
final contact with the various locations, which were scraped off the end of the insulation
on the electrical contact. Copper coil strip the screw on the sliding contact, will be
changing its inductance. When contact is close to a final inductance is very small, and the
cycle will tune stations in the radio frequency carrier too. When contacting other end is
near, inductance will be higher and the cycle will tune stations in the radio frequency
carrier is very low.
11. Detector: detector "germanium diode" is something. Germanium diode electricity
flows in one direction, but you can in the opposite direction. Germanium diode and a
small cylinder-like metal wire glass from each at the end.
12. Amplifier: signal that we point the antenna and tuner are very small - perhaps only a
few thousand volts. (1 ½ volt batteries in regular flashlight). Therefore, the amplifier
makes a great sign. Radio, we both "integrated circuit" or "chips," said the young man,
making signs. There is a separate children integrated circuits. Use type "op - AMPS" or
"breeders work" is called. Like a little spider with eight legs, each op - come! We will use
them every radio two.
13. Speaker. Speaker is something that actually makes a sound. With a small
electromagnet electrical, signal to move a piece of plastic or paper, and use, makes it
sound that we hear. Stereo radio speakers only smaller versions that you, your home, or
may be speaking television.

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