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How to transmit the music from the sound circuit to a speaker

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I have recently been fascinated with wireless-ness. I thought of a little project so I could do a little research in this area. This project uses a circuit board found in a Christmas card or birthday card that makes it play music when the card is opened. It will also use an RF transmitter and receiver. What I am aiming to do is wirelessly transmit the music from the sound circuit to a speaker via the RF transmitter and receiver.

Parts bought from kynix I plan to use:

RF Link Transmitter (315 MHz) -

RF Link Receiver (315 MHz) -

Music Circuit (something similar to this link) -

Original circuit: Music circuit -> Speaker

New circuit: Music circuit -> RF transmitter -> RF receiver -> Speaker

What I'm looking to do is cut the wires of the speaker and attach the circuit board to the RF transmitter. And then attach the speaker to the RF receiver. I'm assuming I'm going to need some sort of buffer attached to the receiver. Is there any sort of hardware buffer I would be able to use or would using a buffer through code be easier?

Music circuit -> RF transmitter -> RF receiver -> Buffer -> Speaker

Another thing I'm worried about is the data I will be sending. Would I need an analog to digital converter to change the original signal (that was sent to the speaker itself) to a digital signal for the RF transmitter to transmit correctly? And then would I need to change that signal back to an analog signal?

Music circuit -> ADC -> RF transmitter -> RF receiver -> Buffer -> DAC -> Speaker

Would this be a practical solution?

I know using 2 arduinos would probably be easier, but I want to eliminate the use of micro controllers and code, and focus on the hardware and circuit analysis of the system. Also, I'm using the RF link transmitter and receiver because they are cheap and I want to focus on how the signal is created, sent, and received.

Edited by lingyueqing

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