Optocouplers for audio applications

[xirix]

Does anybody experimented usual optocouplers in audio applications?
I'm considering direct transfer of audio signal through optocouplers, not special techniques (modulations).
I don't want to use special linear optocouplers.
Any suggestion will be wellcomed.
Thanks

 

[Moss]

General approach is to use two identical optocouplers. One in forward path, and one in feedback, Thus providing compensation for nonlineap amplitude response.

 

[aNdreiBuuu]

Hi,
You have 2 options:
1. as Moss said use 2 identical optocouplers (in same package)
2. use FM modulation for audio isolation.

The common way is to use the 1'st option. If you're searching on HP web site you'll find a good essay regarding optocoupler compensation for nonlinear amplitude response.

Hope this help,
//a

 

[IanP]

I think that for isolation of a baseband audio signal you don't have any other option than linear..
You not only need good frequency response but also amplitude .. and standard opto-couplers have been designed for DIOs, ie. 0 or 1.
Besides, linear optocouplers are not that expensive..