There is a list of components you need to get a 4.8khz sine wave: 

1 NE555
1 Capacitor 47pf
1 Capacitor 100pf
3 Capacitors 10nf
1 Capacitor 100nf
1 Resistor 1MΩ
1 Resistor 10KΩ
3 Resistors 3.3kΩ

 
First, start the assembly of the NE555 in astable mode. 

Then mesuring the signal from the Pin 3 (out), we get a square wave of 4.85khz
Using the formula : 

nota: to keep a duty cycle of 50%, R2 has to be 100 times R1.

Now let's check it in real life.

To get a sine wave we have to build a 3 Stages Low Pass RC Filter.
For that we use this formula: 

We know the frequency so let's detemine R and C. 
Since i don't have that many capacitors i choose C = 10nf.
So we have to find R. 

We end up with R = 3.3KΩ
Building the 3 stages Low Pass RC Filter.

Why a 3 stages filter ? 

Each stage serve to eliminate the harmonics and then get a sine wave.
Let's probe at S1 S2 and S3.

There is an issue it has a DC component that is "crushing" our sine wave after filtering.

So to block the DC we add a 100nf capacitor in serie with the filter just at the ouput of the pin3(out) of the NE555.

And so we have the NE555 timer used as sine wave generator. 

I hope you've learned something funny !