[enquiry]Compression IC NE570 compandor

[elnino86]

Hello everyone,

Im currently doing a project to develop a hearing aid system.I goin to use NE570 compandor as a compression circuit but im confuse how to implement the IC.The 16 pin really confuse me since im lack of reference.Can anyone guide me to this?

[Khron]

I believe the datasheet of the NE570 is more or less "self-explanatory". It seems to contain all the calculations you need, you just have to decide on some time and/or component values.

[elnino86]

I got what you mean. But im really need some example on implementation of NE570(schematic).Im confuse here.

[Khron]

How about the application notes ??

[lineup]

Originally posted by elnino86
I got what you mean. But im really need some example on implementation of NE570(schematic).Im confuse here.

Search google images: http://images.google.com/
Keyword: NE570
You will find more schematics than you need

[elnino86]

Originally posted by lineup


Search google images: http://images.google.com/
Keyword: NE570
You will find more schematics than you need

Haha i had try on that That bring me the issue on this forum.

[elnino86]

Originally posted by Khron
How about the application notes ??

Still learning Im confuse about gain cell pin(3,14).

[lineup]

I think you should study and setup a basic compressor (Fig.7)
and one basic expander (Fig.6), from the NE570 datasheet.

What I understand the compressor can be set to some Gain.
And the Expander will take the compressed signal and put it back for normal use.

The application note pdf is also useful (I think)
Applications for Compandors NE570/SA571
http://www.onsemi.com/pub_link/Collateral/AND8159-D.PDF

[lineup]

The gain cell is where it happens.
Based on the RECT_IN (a rectified signal level)
the gain cell will adjust the gain to required gain level.

If the RECT_IN is fed (getting feedback) from the output, and the output level is very low
then the RECT_IN will tell the gain cell to provide more gain
and so the signal at output gets stronger.

[opikbdg]

Originally Posted by elnino86

Hello everyone,

Im currently doing a project to develop a hearing aid system.I goin to use NE570 compandor as a compression circuit but im confuse how to implement the IC.The 16 pin really confuse me since im lack of reference.Can anyone guide me to this?

try
http://www.icbase.com/pdf/PHI/PHI08040106.pdf
the ne578 are more easy to understand..

cheers