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50% off our best selling FM Bug Transmitter at:
http://www.bug-transmitter.com

Lets make a very simple mono audio FM transmitter
In this video i will show you how to make a 
FM Transmitter that is very easy to build.
Frequency: 90Mhz - 108Mhz
Current consumption: 11mA at 3v 
Working Voltage: 3 - 12v ,more Voltage more transmission range !
Stability: Not bad
Distance: 300ft - 3000ft, Penetrates through walls and ceilings.
RF Power: 3mW RF output at 3v and about 24mw at 9v
Parts List:

R1 Resistor: 47k
R2 Resistor: 47k
R3 Resistor: 22k
R4 Resistor: 68k
R5 Resistor: 270R
R6 Resistor: 47K

C1 Capacitor: 1n
C2 Capacitor: 1n
C3 Capacitor: 4.7uf
C4 Capacitor: 4.4uf
C5 Capacitor: 1n
C6 Capacitor: 10pf
C7 Capacitor: 33pf
C8 Capacitor: 100n
C9 Capacitor: 1n
C10 Capacitor:10pf
C11 Capacitor:33pf
C12 Capacitor:100nf

2n3904 transistor x 2
Antenna wire: 165cm wire
L1 Coil 5 turn 
L2 1uH
3.5mm audio cable
PP3 battery clip

Music written by Tom Cusack
Composer -- Tom Cusack
Music from www.freemusicforvideos.com

 

 


The EasyACC Bluetooth speaker gives your lots of flexibility on what type of device you use to deliver your music. It has the capability to pair through a bluetooth connection, a slot for an SD memory card (up to 16gigs), and auxiliary input, or through standard FM radio. While it may not provide booming sound it more than holds it own in this price range.

Notes

- Has several different playing modes including playing from SD video cards, FM radio, Bluetooth, or auxiliary inputs

- Can be used as a speakerphone

- Has a removable rechargeable battery - so when the battery dies it can be replaced.

- The bluetooth works very well - it is easy to pair and has significant range (it claims to be 10Meters/32 feet)

- The sound quality is about what I expected. The bass lacks depth and the top end sounds a bit shallow - but that does not mean that it sounds *bad* just that it tuned to to the middle range of the frequencies. However, it sounds as good or better than many of the other bluetooth speakers at this price point.

- Sound Volume is loud enough to fill an entire room - but it may not have the power to be heard at a distance when being used outside. The speaker has two drivers at 2watts each - for a total of 4 watts of power.

- I had some issues in being able to pull in FM radio stations when I was indoors

- Also works as a speakerphones

- Be sure to keep (and read) your instruction manual since some of the key commands are not intuitive.

Final Verdict - This is a speaker for people who want a lot of flexibility. While I had limited success with the FM radio the EasyACC Bluetooth speaker it still provides lots of flexibility, decent sound, and a nice value.

4 Stars

Please Note I received this product in exchange for an unbiased review

 

 


Science@NASA: EMS Electromagnetic Spectrum (Episode 2) - Radio Waves

The electromagnetic spectrum is the range of all possible frequencies of electromagnetic radiation. The "electromagnetic spectrum" of an object is the characteristic distribution of electromagnetic radiation emitted or absorbed by that particular object.

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Please SUBSCRIBE to Science & Reason:
• http://www.youtube.com/Best0fScience
• http://www.youtube.com/ScienceTV
• http://www.youtube.com/FFreeThinker
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MEASURING THE ELECTROMAGNETIC SPECTRUM

The electromagnetic (EM) spectrum is just a name that scientists give a bunch of types of radiation when they want to talk about them as a group. Radiation is energy that travels and spreads out as it goes - visible light that comes from a lamp in your house and radio waves that come from a radio station are two types of electromagnetic radiation.

Other examples of EM radiation are microwaves, infrared and ultraviolet light, X-rays and gamma-rays. Hotter, more energetic objects and events create higher energy radiation than cool objects. Only extremely hot objects or particles moving at very high velocities can create high-energy radiation like X-rays and gamma-rays.

• http://imagine.gsfc.nasa.gov/docs/sci...

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RADIO WAVES

Radio waves are a type of electromagnetic radiation with wavelengths in the electromagnetic spectrum longer than infrared light. Like all other electromagnetic waves, they travel at the speed of light. Naturally-occurring radio waves are made by lightning, or by astronomical objects. Artificially-generated radio waves are used for fixed and mobile radio communication, broadcasting, radar and other navigation systems, satellite communication, computer networks and innumerable other applications.

Different frequencies of radio waves have different propagation characteristics in the Earth's atmosphere; long waves may cover a part of the Earth very consistently, shorter waves can reflect off the ionosphere and travel around the world, and much shorter wavelengths bend or reflect very little and travel on a line of sight.

Discovery and utilization: Radio waves were first predicted by mathematical work done in 1865 by James Clerk Maxwell. Maxwell noticed wavelike properties of light and similarities in electrical and magnetic observations. He then proposed equations, that described light waves and radio waves as waves of electromagnetism that travel in space. In 1887, Heinrich Hertz demonstrated the reality of Maxwell's electromagnetic waves by experimentally generating radio waves in his laboratory. Many inventions followed, making practical the use of radio waves to transfer information through space.

Propagation: The study of electromagnetic phenomena such as reflection, refraction, polarization, diffraction and absorption is of critical importance in the study of how radio waves move in free space and over the surface of the Earth. Different frequencies experience different combinations of these phenomena in the Earth's atmosphere, making certain radio bands more useful for specific purposes than others.

Radio communication: In order to receive radio signals, for instance from AM/FM radio stations, a radio antenna must be used. However, since the antenna will pick up thousands of radio signals at a time, a radio tuner is necessary to tune in to a particular frequency (or frequency range). This is typically done via a resonator (in its simplest form, a circuit with a capacitor and an inductor). The resonator is configured to resonate at a particular frequency (or frequency band), thus amplifying sine waves at that radio frequency, while ignoring other sine waves. Usually, either the inductor or the capacitor of the resonator is adjustable, allowing the user to change the frequency at which it resonates.

In medicine: Radio frequency (RF) energy has been used in medical treatments for over 75 years generally for minimally invasive surgeries and coagulation, including the treatment of sleep apnea.

• http://en.wikipedia.org/wiki/Radio_waves



Enjoy music from your android phone with this Wireless FM Transmitter for Car Radio that lets you play your phone's music over your vehicle's radio stations. 

IMB aFM FM Transmitter lets you listen to your iPhone or Android Phone on your car's FM radio. The advanced audio circuitry rejects cell phone interference while the external antenna improves signal transmission, so you hear your music loud and clear. 

This wireless radio transmitter is the ultimate car companion for your iPhone or iPod. Compatible with most Apple® iPod® Android Phone and audio players with a 3.5mm headphone jack; plays your audio device through your car stereo

This FM Radio Transmitter also provides the convenience and safety of the hands free through your car fm radio quickly and easily.

Simple Plug and Play Gadget 

No Bluetooth!
No Setup!
No Battery!
No Wire!
No App!

iPhone FM Transmitter works best on OLDER cars. No matter if you have a cd, cassette, or 8 track player in your vehicle. This gadget will work beautifully with any FM radio.

Simple 3 Steps Operation 

1. Set your car radio dial or preset
2. Connect this gadget to your iPhone5 
3. Crank it up and enjoy

Is there such a thing as gift giving etiquette? Of course! There are quite a few DOs and DON'Ts of gift giving. Remember, though, that each situation will be a little different from the next, just as individuals differ from each other. We've done a little research to provide a basic gift giving guide. These aren't set in stone, but they should give you a good idea about how to approach gift giving in most situations.

GIFT GIVING ETIQUETTE

Dinner or Party Invitation?

When someone invites you over for a "get together", you'll want to bring a small gift to show your appreciation for the invitation. This could include a candle, flowers, or a bottle of wine.

"Please, No Gifts"

If you've been invited to a birthday party, graduation party, anniversary celebration, wedding, or any gift giving occasion and the invitation specifically reads: "No Gifts, Please", then it is appropriate to respect that request. If you feel that you must bring "something", try a card or some other very small sentiment.

 

Is money an appropriate gift?

It is appropriate to give money in a few (sparse) situations, like when a teen-ager asks for it. But try to avoid giving money. It's more thoughtful to give a gift certificate or gift card, but only if you take the time to consider the the appropriate store or restaurant. Pick something that will be enjoyable and/or useful for the gift recipient.

 

Other Gift Giving Hints

- Don't give loud toys to children

- Don't give things that YOU want

- Always try to wrap a gift. If you don't have the time or talent to make it look nice, spend a dollar on a gift bag and some tissue paper.

- Include a card with your gift, and actually write a personal note in it

- Don't re-gift a present that you have been given unless a) it is still in it's original packaging, b) it's appropriate for the next recipient, and c) the re-gifting will NOT be discovered (by the original giver or the new recipient)

- Always get a gift for a wedding, even if you can't attend (unless "no gifts" were requested)

- Always bring a gift to a shower, but don't feel obligated to do so if you aren't able to attend

Business Gift Giving

Business gifts are appropriate in the following situations:

- Close of a business deal (beware of international etiquette)

- Group gifts for a retirement, serious illness, or other momentous occasion

- Holidays (like a Secret Santa or grab bag)

In a business situation, don't give gifts that are:

- Personal in nature (perfume, red roses, etc.)

- Only from you (give outside of the office in this situation)

- In violation of company policy (check your company guidelines)

- Not considerate of a person's culture, diet, environment, etc.

GIFT RECEIVING ETIQUETTE

When you receive a gift, no matter what you think of it, say "Thank you". Accept any gift politely and remember that it's a GIFT that was not necessary.


By A Heath

Article Source: http://EzineArticles.com/27932