Loudness stage

WebWilly · 13th December 2011, 10:35 AM

Hi all.
I'd like to build a simple "loudness" stage for include beetwen TV low level output and the line input in my amplifier.
I'm thinking in a operational step like LM387 or so. But I have not idea about RC filters.
I need to have a single +V for the circuit (if is +5V, better).
Thanks for your help
WebWilly

Mooly · 14th December 2011, 07:34 AM

"Loudness" stage often means a modified frequency response such as the old "loudness" control that was always fitted to 1970/80's music centres and amplifiers.

Or do you mean a preamplifier ? to just boost the signal level.

WebWilly · 14th December 2011, 07:54 AM

Thanks Mooly.
I mean the old "loudness" control you refered. The aim is to listen the TV in very low sound level in the room but with confortable feeling. I know that this is not purity sound, because some tones will be modify.
Thanks
WebWilly

Mooly · 14th December 2011, 01:01 PM

Haven't anything I can think of to recommend tbh. A proper loudness control uses a tapped volume control.

This was an odd design with limitations but might achieve what you are after at a fixed level,
VOLUME CONTROL PASIVE !

PRR · 15th December 2011, 12:56 AM

> in very low sound level in the room but with comfortable feeling.

WebWilly · 15th December 2011, 06:50 AM

Many tanks Mooly and PRR. I'll try with this and let you know the result.

PRR: tha capacitor is 0.03 uF if I read correctely, isn't ?

Thanks

mjf · 15th December 2011, 06:06 PM

..........examples from an old hifi - book

tiefbassuebertr · 5th March 2012, 11:44 AM

check out this URL:
Grimm Audio

The Luxman Receiver R5030 uses a variable loudness filter - go to page 15 about sm from
Luxman R-5030 | Owners Manual, Service Manual, Schematics, Free Download | HiFi Engine

13th December 2011, 10:35 AM	#1
WebWilly diyAudio Member Join Date: Nov 2011 Location: Madrid, Spain	Loudness stage Hi all. I'd like to build a simple "loudness" stage for include beetwen TV low level output and the line input in my amplifier. I'm thinking in a operational step like LM387 or so. But I have not idea about RC filters. I need to have a single +V for the circuit (if is +5V, better). Thanks for your help WebWilly

14th December 2011, 07:34 AM	#2
Mooly diyAudio Member Join Date: Sep 2007	"Loudness" stage often means a modified frequency response such as the old "loudness" control that was always fitted to 1970/80's music centres and amplifiers. Or do you mean a preamplifier ? to just boost the signal level. __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

14th December 2011, 01:01 PM	#4
Mooly diyAudio Member Join Date: Sep 2007	Haven't anything I can think of to recommend tbh. A proper loudness control uses a tapped volume control. This was an odd design with limitations but might achieve what you are after at a fixed level, VOLUME CONTROL PASIVE ! __________________ ------------------------------------------------------- *A simulation free zone.* *Design it, build it, test it.*

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14th December 2011, 07:54 AM	#3
WebWilly diyAudio Member Join Date: Nov 2011 Location: Madrid, Spain	Thanks Mooly. I mean the old "loudness" control you refered. The aim is to listen the TV in very low sound level in the room but with confortable feeling. I know that this is not purity sound, because some tones will be modify. Thanks WebWilly

15th December 2011, 12:56 AM	#5
PRR diyAudio Member Join Date: Jun 2003 Location: USA	> in very low sound level in the room but with comfortable feeling.

15th December 2011, 06:50 AM	#6
WebWilly diyAudio Member Join Date: Nov 2011 Location: Madrid, Spain	Many tanks Mooly and PRR. I'll try with this and let you know the result. PRR: tha capacitor is 0.03 uF if I read correctely, isn't ? Thanks

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