Tone Control with Loudness ?

thoronx · 18th June 2008, 07:02 PM

Hi,

I'd like to ask for some good schematic for active tone control, for treble and bass (cca+-20dB) with loudness compensation, I have saw several designs, but all of these designs uses elements that I want to avoid.

I don't like to use:

1. tone control ic's like tda1524 or lm1036
2. center tapped pot, because it is hard to find in My country.
3. "center tapped" attenuator for volume control
4. dsp

Exactly I am not sure is it possible to build this (loudness compensation is important) avoiding things from My list ?!

Thanks for help.

thoronx · 21st June 2008, 03:19 PM

... anybody ... any idea ... nothing ?!

Steerpike · 21st June 2008, 04:35 PM

To get variable loudness, yu HAVE to use some sort of special pot, either a tapped pot, or a 4-gang pot.
POSSIBLY you could make do with two double-gang pots (separate L/R volume adjust) or connect them together with a set of gears.

Minion · 21st June 2008, 04:42 PM

For the tone controll you could use an active Tone controll that Boosts and also cuts....You can use a couple of opamps to do this....

Maybe something like this:

Cheers

nigelwright7557 · 21st June 2008, 09:57 PM

Quote:

Originally posted by thoronx
Hi,

I'd like to ask for some good schematic for active tone control, for treble and bass (cca+-20dB) with loudness compensation, I have saw several designs, but all of these designs uses elements that I want to avoid.

I don't like to use:

1. tone control ic's like tda1524 or lm1036
2. center tapped pot, because it is hard to find in My country.
3. "center tapped" attenuator for volume control
4. dsp

Exactly I am not sure is it possible to build this (loudness compensation is important) avoiding things from My list ?!

Thanks for help.

Loudness compensation is simply lifting the bass and treble at lower listening levels. This is to compensate for the hearings losses at low sound levels.

ajazz · 21st June 2008, 10:01 PM

Try this

http://www.redcircuits.com/Page67.htm

Play around with caps to suit your Bass-Treble taste.

ajazz · 21st June 2008, 10:08 PM

also with resistors for +-db's
the circuit is self explanatory

forr · 21st June 2008, 10:18 PM

Hi ThoronX,
I suggest you do some search on this forum with key words "Holman" and "loudness. Then you can easily get the schematics of the Apt Holman preamp.

thoronx · 23rd June 2008, 08:38 AM

Minion, thanks , nice tone control, but I see no Loudness SW.

thoronx · 23rd June 2008, 08:39 AM

From My point of view Loudness Compensation (with Tone Control) is a 'must' for an amp, specially when I listen music at low volumes as I do frequently ...

I had extreme amount of Google (web and image) queries in the past few months about Loudness compensation or practical implementation of Fletcher–Munson curves,

maching my requirements (no tone control ic, no center tapped pot, no tapped attenuator, no dsp), but without any significant result (schematic+pcb), what was found is a few interesting schematic:

1. PC Preamp Project By Dave Erickson http://www.djerickson.com/pcpreamp/, the schematic is http://www.djerickson.com/pcpreamp/pdf/Pc_preamp.pdf

2. ON Semiconductor's document "Audio Circuits Using the NE5532/4" http://www.eetasia.com/ARTICLES/2007..._ACC_AN_01.pdf

...then I gave up google.

Next I had an idea to find some service manuals for any legacy amplifiers that uses Loudness button (amps mainly produced in the 70's 80's 90's ...) so I went to

http://www.eserviceinfo.com/ and with help of Google (to find model of the amp) downloaded different service manuals, and now I am analysing them ... Sony's implementation in amp model TA-FE210 is looking good ...

18th June 2008, 07:02 PM	#1
thoronx diyAudio Member Join Date: May 2007	Tone Control with Loudness ? Hi, I'd like to ask for some good schematic for active tone control, for treble and bass (cca+-20dB) with loudness compensation, I have saw several designs, but all of these designs uses elements that I want to avoid. I don't like to use: 1. tone control ic's like tda1524 or lm1036 2. center tapped pot, because it is hard to find in My country. 3. "center tapped" attenuator for volume control 4. dsp Exactly I am not sure is it possible to build this (loudness compensation is important) avoiding things from My list ?! Thanks for help.

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21st June 2008, 03:19 PM	#2
thoronx diyAudio Member Join Date: May 2007	... anybody ... any idea ... nothing ?!

21st June 2008, 04:35 PM	#3
Steerpike diyAudio Member Join Date: Jan 2006 Location: Johannesburg, South Africa	To get variable loudness, yu HAVE to use some sort of special pot, either a tapped pot, or a 4-gang pot. POSSIBLY you could make do with two double-gang pots (separate L/R volume adjust) or connect them together with a set of gears.

21st June 2008, 04:42 PM	#4
Minion diyAudio Member Join Date: May 2006	For the tone controll you could use an active Tone controll that Boosts and also cuts....You can use a couple of opamps to do this.... Maybe something like this: Cheers

21st June 2008, 10:01 PM	#6
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	Try this http://www.redcircuits.com/Page67.htm Play around with caps to suit your Bass-Treble taste.

21st June 2008, 10:08 PM	#7
ajazz diyAudio Member Join Date: Apr 2005 Location: INDIA	also with resistors for +-db's the circuit is self explanatory

21st June 2008, 10:18 PM	#8
forr diyAudio Member Join Date: Dec 2004 Location: Next door	Hi ThoronX, I suggest you do some search on this forum with key words "Holman" and "loudness. Then you can easily get the schematics of the Apt Holman preamp.

23rd June 2008, 08:38 AM	#9
thoronx diyAudio Member Join Date: May 2007	Minion, thanks , nice tone control, but I see no Loudness SW.

23rd June 2008, 08:39 AM	#10
thoronx diyAudio Member Join Date: May 2007	From My point of view Loudness Compensation (with Tone Control) is a 'must' for an amp, specially when I listen music at low volumes as I do frequently ... I had extreme amount of Google (web and image) queries in the past few months about Loudness compensation or practical implementation of Fletcher–Munson curves, maching my requirements (no tone control ic, no center tapped pot, no tapped attenuator, no dsp), but without any significant result (schematic+pcb), what was found is a few interesting schematic: 1. PC Preamp Project By Dave Erickson http://www.djerickson.com/pcpreamp/, the schematic is http://www.djerickson.com/pcpreamp/pdf/Pc_preamp.pdf 2. ON Semiconductor's document "Audio Circuits Using the NE5532/4" http://www.eetasia.com/ARTICLES/2007..._ACC_AN_01.pdf ...then I gave up google. Next I had an idea to find some service manuals for any legacy amplifiers that uses Loudness button (amps mainly produced in the 70's 80's 90's ...) so I went to http://www.eserviceinfo.com/ and with help of Google (to find model of the amp) downloaded different service manuals, and now I am analysing them ... Sony's implementation in amp model TA-FE210 is looking good ...

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