AGC is used in subwoofer for limiter!

GPE · 31st December 2006, 01:26 PM

I would like to seek a kind of AGC circuit to limit output singnal so that distortion is low when input singnal is excess.

The output amplifier should be keeped max 200w.

Input sensitivity : input singnal 500mv ,output 200w!

Who can supply me AGC-LIMITER schematic?

DigitalJunkie · 31st December 2006, 01:48 PM

http://sound.westhost.com/project53.htm

GPE · 31st December 2006, 02:15 PM

If there are other way to meet the function!

I think that the assembly process is difficulty.

Thanks!

GPE · 1st January 2007, 06:18 AM

I have tried to do the AGC-limit with IC-LM13700!

But the distortion will increase to 2%.

The Driver will feel be worse!

Who can help to make the AGC perform well with LM13700 or Mosfet.

pinkmouse · 1st January 2007, 10:54 AM

Quote:

Originally posted by GPE
I have tried to do the AGC-limit with IC-LM13700!

But the distortion will increase to 2%.

The distortion will increase, because the the limiter is changing, (distorting), the input signal in a non linear fashion. It's what it does, any compression or limiting will do the same.

ChocoHolic · 3rd January 2007, 04:47 PM

How about posting the schematic of the circuit, which you have tried....

In general I would propose an unsymmetric time behaviour for the acting characteristic.
If the input signal is to large then the gain must be reduced fast and limit the output voltage to a certain level.
Moving back towards higher gain must be slow. Slow compared to the normal bass pulse sequence of your music programm.
So the limiter will pull down the gain during the first waves of the drum and then 'remember' the right gain for the next beats...
But you will always have some influence of the 'changing/pumping gain' on the output signal.

ChocoHolic · 3rd January 2007, 04:52 PM

Add on:
'If the input signal is to large...' is misleading.
The relevant control criteria for the regulation loop is the output.
Just from outside it will look like high gain for low input signals and dropping gain above a a certain input level.

micb · 7th January 2007, 01:29 PM

Quote:

Originally posted by GPE
I would like to seek a kind of AGC circuit to limit output singnal so that distortion is low when input singnal is excess.

The output amplifier should be keeped max 200w.

Input sensitivity : input singnal 500mv ,output 200w!

Who can supply me AGC-LIMITER schematic?

Why do you want this limiter in place?

I can't help think there is a reasion why you are wanting one that may be solved another way.

31st December 2006, 01:26 PM	#1
GPE diyAudio Member Join Date: Aug 2006	AGC is used in subwoofer for limiter! I would like to seek a kind of AGC circuit to limit output singnal so that distortion is low when input singnal is excess. The output amplifier should be keeped max 200w. Input sensitivity : input singnal 500mv ,output 200w! Who can supply me AGC-LIMITER schematic?

31st December 2006, 02:15 PM	#3
GPE diyAudio Member Join Date: Aug 2006	seek If there are other way to meet the function! I think that the assembly process is difficulty. Thanks!

1st January 2007, 06:18 AM	#4
GPE diyAudio Member Join Date: Aug 2006	nobady? I have tried to do the AGC-limit with IC-LM13700! But the distortion will increase to 2%. The Driver will feel be worse! Who can help to make the AGC perform well with LM13700 or Mosfet.

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31st December 2006, 01:48 PM	#2
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	http://sound.westhost.com/project53.htm

3rd January 2007, 04:47 PM	#6
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	How about posting the schematic of the circuit, which you have tried.... In general I would propose an unsymmetric time behaviour for the acting characteristic. If the input signal is to large then the gain must be reduced fast and limit the output voltage to a certain level. Moving back towards higher gain must be slow. Slow compared to the normal bass pulse sequence of your music programm. So the limiter will pull down the gain during the first waves of the drum and then 'remember' the right gain for the next beats... But you will always have some influence of the 'changing/pumping gain' on the output signal.

3rd January 2007, 04:52 PM	#7
ChocoHolic diyAudio Member Join Date: Dec 2003 Location: Munich	Add on: 'If the input signal is to large...' is misleading. The relevant control criteria for the regulation loop is the output. Just from outside it will look like high gain for low input signals and dropping gain above a a certain input level.

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