PCS Electronics PCS Electronics - home page PCS Electronics  
RegisterSearchFAQAM & FM Radio transmitters shop UsergroupsLog in
Wireless surround speakers

 
Reply to topic    PCS-Electronics Forum Index » Schematics - help and ideas View previous topic
View next topic
Wireless surround speakers
Author Message
DukerX
New registered user
New registered user


Joined: 25 Jul 2004
Posts: 3

Post Wireless surround speakers Reply with quote
I'm currently planning to make a a couple of wireless speakers to use around the house.
The speakers wil have built-in power supply, amplifier CPU and radio receiver.

I got the Powersupply, Amp and CPU part covered, but I'm not so sure about the radio receiver.
I'm thinking the receiver should be controlled by the CPU, so a digitally controlled PLL chip might do the trick.

The idea is that each speaker has some sort of control panel ( 7seg LED display and a pair of buttons ) where the signal source is selected.
I think 7 to 10 different channels would be enough.

The idea is to have at least two base stations, where one is connected to the TV-set (5.1 surround output) and one to the computer (stereo) and then be able to select the source for each speaker.

The really tricky bit is the base station for the surround signal.
I've been thinking about using 3 stereo transmitters, each tuned to a different frequency, but I think the transmitters could interfere with eachoter but I'm not sure.

Could this be done at all?
Mon Jul 26, 2004 12:28 am View user's profile Send private message MSN Messenger
pcs
Site master
Site master


Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
They won't interfere if you use them at frequencies sufficiently
separated and make sure the transmitters are using just as much
power as needed, nothing more. And of course provide good shielding
between them and place antennas as far from eachother as possible.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Mon Jul 26, 2004 12:50 am View user's profile Send private message Visit poster's website
DukerX
New registered user
New registered user


Joined: 25 Jul 2004
Posts: 3

Post Reply with quote
Ok.. So I'll have to use more than one antenna... Ok..

But for the receiver part.. I can't seem to find any "single chip" receivers that has a digitally controlled tuner.

The TDA7000 keeps popping up various places on the net, and a search for "FM PLL" on www.datasheetarchive.com came up with a bunch of various circuits, including some SANYO parts (LA3430) but I don't understand how to use these parts.

What I need is a (preferably) one-chip FM receiver that can be tuned from a microprocessor.
Any suggestions?
Mon Jul 26, 2004 1:55 am View user's profile Send private message MSN Messenger
pcs
Site master
Site master


Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
This might be bigger than you can handle. Its no small feat.

You may need to separate receiver into more than 1 chip.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Mon Jul 26, 2004 7:49 am View user's profile Send private message Visit poster's website
DukerX
New registered user
New registered user


Joined: 25 Jul 2004
Posts: 3

Post Reply with quote
Hmm...
Perhaps I could use a couple of TDA7000 chips, pretuned, and just use an analog multiplexer.
It's just a thought...

But these Sanyo-chips (LA3401 and LA3450)..
What are they used for?
Is it a complete stereo FM receier, or does it need more active components to work (not counting audio-out amplifier)?

I have also come across a sort of diode wich changes capasity according to voltage... Any comments on this?
Mon Jul 26, 2004 3:18 pm View user's profile Send private message MSN Messenger
pcs
Site master
Site master


Joined: 18 Jan 2002
Posts: 3063
Location: Radio Land

Post Reply with quote
The fact that you need to ask these questions tells me that this
is probably too big of a problem for you.

No, you can not use multiplexing for this (tda...).

Look for the datasheets of the other chips.
Remember, google is your friend.

_________________
Best regards,
Marko - PCS Electronics
--------------------------------------------------------
Turn your PC into a FM radio station!
http://www.pcs-electronics.com
fax +386 4 2316 128
Mon Jul 26, 2004 5:26 pm View user's profile Send private message Visit poster's website
Display posts from previous:    
Reply to topic    PCS-Electronics Forum Index » Schematics - help and ideas All times are GMT + 1 Hour
Page 1 of 1

 
Jump to: 
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


Powered by phpBB © 2001, 2005 phpBB Group