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Old 18th June 2008, 06:02 PM   #1
thoronx is offline thoronx  Yugoslavia
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Default 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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Old 21st June 2008, 02:19 PM   #2
thoronx is offline thoronx  Yugoslavia
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... anybody ... any idea ... nothing ?!
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Old 21st June 2008, 03:35 PM   #3
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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.
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Old 21st June 2008, 03:42 PM   #4
Minion is offline Minion  Canada
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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:


Click the image to open in full size.


Cheers
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Old 21st June 2008, 08:57 PM   #5
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Default Re: Tone Control with Loudness ?

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.
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Old 21st June 2008, 09:01 PM   #6
ajazz is offline ajazz  India
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Try this

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

Play around with caps to suit your Bass-Treble taste.
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Old 21st June 2008, 09:08 PM   #7
ajazz is offline ajazz  India
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also with resistors for +-db's
the circuit is self explanatory
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Old 21st June 2008, 09:18 PM   #8
forr is offline forr  France
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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.
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Old 23rd June 2008, 07:38 AM   #9
thoronx is offline thoronx  Yugoslavia
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Minion, thanks , nice tone control, but I see no Loudness SW.
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Old 23rd June 2008, 07:39 AM   #10
thoronx is offline thoronx  Yugoslavia
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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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