The receivers will be able to receive only one of the four signals.
Lets say the transmitter has four button on it, each one to activate one of the receivers and the receiver will play some sound. I'm interested in making the receivers as small as possible less than 1 (in)sq.
This is what i'm thinking. the transmitter will transmit sound modulated at a high frequency (four different one for each receiver, depending on which button is pressed). The receivers will have a filter, demodulator and a speaker. This will make the receiver very small. the filter and the demodulator will the simplest one possible. this will eliminated the need for the sound signal to be stored the receiver.
I don't want to but them i want to make them I'm looking for the schematic, Any other design idea is welcomed.
<font size=-1>[ This Message was edited by: nitr8 on 2002-04-21 03:51 ]</font>