Wireless Intercom - Electronic Circuits Projects Diagrams Free

t_anjan · 7th May 2007, 01:41 PM

The basic idea is to have an audio transceiver in various rooms of my house. Each should have buttons like Room 1, Room 2, and so on. Pressing a button and speaking should result in the corresponding receiver receiving the voice signal. Full duplex is not necessary. Frequency range is not important. Would rather avoid (obviously) the 88-108 MHz FM. Range need not be more than 200 metres LOS. I would like some ideas to start going about making this project.

I searched on the forum and Google for wireless intercoms and such, but couldn't find any satisfactory results.
Thanks!

CheapSlider · 7th May 2007, 07:22 PM

Sounds like a job for a DECT phone system

Secure frequency, non FM broadcast band
Signal and talk between any of up to 6 handsets

You'd be very hard pressed to make anything comparable for the same price

t_anjan · 8th May 2007, 10:59 PM

Don't think "DECT" phone systems are available here. Is it really that tough to make? Non FM broadcast band is a must, but secure frequency, in terms of eavesdropping, is not that important.

mneary · 9th May 2007, 12:47 AM

93 different ads for "DECT" phones on ebay India. You probably have other sources if you look in the right places.

To build your own, you first have to find a suitable license free band which is still empty, and then design a protocol to alert one handset and not the others, and build the transmitters and receivers.

If you have anything like the "family radio service" like we have in the States, those transceivers would be ideal.

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7th May 2007, 01:41 PM	(permalink)
t_anjan	Wireless Intercom The basic idea is to have an audio transceiver in various rooms of my house. Each should have buttons like Room 1, Room 2, and so on. Pressing a button and speaking should result in the corresponding receiver receiving the voice signal. Full duplex is not necessary. Frequency range is not important. Would rather avoid (obviously) the 88-108 MHz FM. Range need not be more than 200 metres LOS. I would like some ideas to start going about making this project. I searched on the forum and Google for wireless intercoms and such, but couldn't find any satisfactory results. Thanks!

7th May 2007, 07:22 PM	(permalink)
CheapSlider	Sounds like a job for a DECT phone system Secure frequency, non FM broadcast band Signal and talk between any of up to 6 handsets You'd be very hard pressed to make anything comparable for the same price

8th May 2007, 10:59 PM	(permalink)
t_anjan	Don't think "DECT" phone systems are available here. Is it really that tough to make? Non FM broadcast band is a must, but secure frequency, in terms of eavesdropping, is not that important.

9th May 2007, 12:47 AM	(permalink)
mneary	93 different ads for "DECT" phones on ebay India. You probably have other sources if you look in the right places. To build your own, you first have to find a suitable license free band which is still empty, and then design a protocol to alert one handset and not the others, and build the transmitters and receivers. If you have anything like the "family radio service" like we have in the States, those transceivers would be ideal.