Looking for audio modulation circuit

[kkdelabaca]

audio modulation

Hello,

I need to modulate an audio signal for transmitting by optica fiber. Somebody knows some circuit to modulate and demodulate audio in FM, PWM...

Regards!

 

[Igor_S]

Re: audio modulation

Hi,
You can use the 555 timer IC, applying audio to threshold pin. Thus you will get the PWM

 

[Aoxomox]

Re: audio modulation

Have a look at this datasheet:

**broken link removed**

I know there was a common part called RC4151, quite old and I don't know the supplier.

-aOxOmOx