I found some designs for power amp clipping indicators but I'm looking for some line level output indicators.  Also looking for a soft limiter design like in the Apogee mini me.  Thanks for any help.

I looking to add this to the back end of a mic pre.



Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #2 on: November 10, 2009, 02:13:57 PM »
Thanks for the link but the website for soundskulptor isn't working in that thread and it's looks as if that's what I need.

JPK

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #3 on: November 12, 2009, 02:34:58 AM »
Sorry for the website flu, it is back to work now.
The LED driving circuit is on page 2 of this PDF : http://www.soundskulptor.com/pdf/mp12-schematic.pdf
But no soft limit here.

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #4 on: November 12, 2009, 05:53:56 AM »
Yeah, No simple soft limiters around?

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #5 on: November 12, 2009, 03:00:37 PM »
As for the soft clipping, well... for starters you could look for the schematic of a limiter, and set fixed parameters: 0 threshold, infinite ratio, fastest attack and release possible...

bronski

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #6 on: December 09, 2009, 12:26:30 PM »
Hello,

nice circuit from soundskulptor. does anybody know how can i make the circuit more sensitive? for -10db consumer level (yes i have some -10db gear in my studio, so i want it to make switchable) it isnt sensitive enough.

Thanks

Olli

Gert

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #7 on: December 09, 2009, 04:27:44 PM »
Sensitivity can be changed in lowering the value of R29 =more sens.

bronski

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #8 on: December 09, 2009, 05:21:19 PM »
Hi Gert,

can this be correct?  ??? lowering r29 doesnt show any effekt.

Olli

Harpo

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #9 on: December 09, 2009, 07:04:49 PM »
Clip level threshold  is actually set for 3,63V by the voltage divider R26/R27.
For -10dB down you could try R27 as 3K9 for similar behaviour, or use a trimmer to adjust to your needs.
R28/R29 is setting threshold of signal present LED.
A common mistake that people make when trying to design something completely foolproof is to underestimate the ingenuity of complete fools.  -Douglas Adams


skipwave

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #10 on: December 09, 2009, 07:31:52 PM »
http://www.groupdiy.com/index.php?topic=27302.0

You probably already looked here: http://gilmore2.chem.northwestern.edu/projects/limiter_prj.htm

Headphone soft clipper scheme could simply be scaled down for line-level (choose your standard/reference).
Quote from: PRR
Now, maybe you don't, or shouldn't, grab the ribbon for far-harpsichord, nor the hot condenser for snare-kissing... yet often we do.

bronski

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #11 on: December 09, 2009, 09:23:30 PM »
Hello,

thanks a lot. i've meanwhile set r28 & r29 to 82k, so the treshold for clipping and signal present is now approx the middle between -10db and +4db. the finetuning will done by two 50k trimmers and a switch in front of the schematic. works fine.

thanks a lot

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #12 on: December 10, 2009, 01:53:38 PM »
Hello,

thanks a lot. i've meanwhile set r28 & r29 to 82k, so the treshold for clipping and signal present is now approx the middle between -10db and +4db. the finetuning will done by two 50k trimmers and a switch in front of the schematic. works fine.

thanks a lot

Can you post your schematic or pcb when done?

bronski

Re: Looking for a simple soft limiter and clipping indicator design.
« Reply #13 on: December 10, 2009, 03:17:57 PM »
Jo,

here's the schemo ;)




Olli


 

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