Passive soft clipper limiter

[Coldsnow]

Hi,
I'm trying to make something similar to the prism over killers.  I found through past discussions a similar circuit that has a resister on the plus and minus of the balanced input then two zener diodes 8.2 running into each other in between.  I can't find how to determine what the resister values should be for a typical 600 oh, output the the input of a digital ad input.
+-resister----------------
                    |
                  8.2 Zener
                    |
                8.2 Zener
                    |
- -resister------------------           

 

[PRR]

> the the input of a digital ad input.

What is the impedance of that?

Shoot the middle. If the output does not like less than 600 ohms, don't go less than 600 (two 300 for balanced). If the DAD(?) input is, oh, say, 27K, stay much less than 27K (two 13.5K). Perhaps two of 2.2K?

 

[grantlack]

If I remember the thread in question, there's a healthy dose of diode matching to concern yourself with.

 

[ricardo]

If I remember the thread in question, there's a healthy dose of diode matching to concern yourself with.

Err..rh!  There are far more important 'matching' issues with a clipper.

eg what is FS on the A/D?

 

[Coldsnow]

The output of the mic pre is 600.  The input of the ad is 10k. 

 

[ricardo]

The output of the mic pre is 600.  The input of the ad is 10k.

That's the Output & Input impedances.

At what voltage does the A/D clip?

 

[Coldsnow]

I actually think I'm going to use them in between my compressor and mixer for mix down on overheads.  I just don't want a loud cymbal ruinning a mix prior to hitting the final ad.