none wrote:
On Mon, 27 Dec 2004 20:44:03 GMT, noners wrote:
How to build a Basic FM transmitter with spare parts available at home
Hi,
I would like to know if you guys know or have a schematic which is
easy to follow for a beginner, on how to build a fm transmitter with
household spare parts? I would like to play back my pc music files
over the transmitter to a radio 15 ft away.
THANKS
ust do a google or dogpile search for "FM transmitter kit".
There are several electronic hobby shops on the web selling all sorts
of DIY kits.
I don't want to discourage you from building stuff. Learning is good.
But let me try to adjust your expectations. I've built several over the
last 40 years...from scratch, Built kits, Bought commercial ones.
None are worth a darn
and here are some of the reasons why.
I live 10 miles from Portland, Oregon. Here, there ISN'T a blank spot
on the FM dial you can use for such transmission...at least with
anywhere near legal power output and a receiver you're likely to be
using. If you live in a rural area, this won't be a problem so much.
Pay particular attention to frequency stability. Doesn't do you any
good if it's drifting all over the place. You probably can't retune the
receiver, cause there's a radio station either side of the spot you're
using.
Plan on running the transmitter from batteries. Unless you use a VERY
good isolated supply, you'll get more hum than you want.
Do you want stereo? That significantly complicates things.
The audio quality is likely gonna be less than you expect.
These things are sold by the zillions for people to use their CD player
in the car. Sounds like crap relative to a direct connection, so there
should be a lot of 'em laying around gathering dust. Try to borrow one
to check your location and adjust your quality expectations. If you're
anywhere near PDX, I'll loan you one or two or three...I get 'em at
garage sales for a quarter. I keep hoping I'll find one that sounds
good. Still hoping.
If you like what you hear, go ahead and start buldin'.
For 15 feet, an excellent solution is often a pair of powered speakers
and a wire. I junked all my fm stuff and switched to powered speakers
everywhere I want music and a roving mp3 cd player. Wireless laptop
with powered speakers can also sound great, but that's overkill
unless you just happen to have laptops laying around. Those Recoton
wireless speakers work quite well at 15 feet. Find those frequently
at garage sales and goodwill stores.
Also, do some math on the costs of electricity. I was amazed to learn
how much it was costing me to have a dedicated computer to play music.
Paid for the walkman-style portable mp3 player in short order on power
savings alone.
mike
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