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Old 5th March 2007, 12:39 AM   #1
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Default Bass and treble control...how?

Hi guys.

I'm looking for a way to control bass and treble in my diy amp.

I found some ICs that control it with a few potentiometers, like the Philips TDA 4857A, which control volum, balance, treble and bass.

Is there any other IC that I can use to control it?
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Old 5th March 2007, 06:02 PM   #2
StalfoS is offline StalfoS  Canada
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If you want a tone control you probably need to build something like this:
http://sound.westhost.com/project02.htm

I would venture that most people in this forum think that tone controls are inappropriate for Hi-Fi systems, but you may have your own specific needs.
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Old 5th March 2007, 07:03 PM   #3
sek is offline sek  Germany
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In essence, Peter Baxandall is credited for the most widespread tone control circuit using only an opamp and some passive components (including two pots). Rod Elliot uses this circuit in the project StalfoS mentions. This is your average tone control as seen on any regular stereo or car stereo for bass and trebble. Not very desirable, though.

Other, more sophisticated circuits include "graphic equalizers" (lame, as seen on bargraph EQs) and "parametric equalizers" (good but more complex, as seen on studio gear), all realizable with only one opamp per frequency range (that is to be influenced).

Cheers,
Sebastian.
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Old 5th March 2007, 07:44 PM   #4
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sek is right: Better than a tone control is a simple graphic equaliser like this: http://www.electronic-kits-and-proje.../1000/1044.pdf ... 5 bands are better than 2 ... although for quality reasons, I would use a better op-amp than the old '741 ... like maybe the AD825 ...
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Old 6th March 2007, 01:17 AM   #5
Leolabs is offline Leolabs  Malaysia
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National Semiconductors' LM1036.
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Old 6th March 2007, 01:25 AM   #6
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" Channel separation, 75 dB typical " From: http://www.national.com/pf/LM/LM1036.html

An excellent choice. One might consider using two chips (as/or two single channel versions) with a well filtered power supply to get that channel seperation number up a bit ...

Make that a decent polystyrene 0.01 uF snubbing cap on pin #11 (+Vcc) and it would do just all right ...
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Old 6th March 2007, 01:49 AM   #7
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What about LF353, super simple. It could double as a buffer.
Attached Images
File Type: jpg lf353_tone.jpg (26.7 KB, 820 views)
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Old 6th March 2007, 02:04 AM   #8
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This LM1036 looks (or sounds) very good, but it is way more expensive than the others. almost 3 times more expensive.

I don't need nothing very high-end-fancy-processor, since I already have a 10 bands x2 equalizer.

my idea is to something to control the bass/treble/balance/volume for the estereo and another controller for the subwoofer channel, baybe just gain and lowpass, like this project: http://sound.westhost.com/project48.htm
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Old 6th March 2007, 02:05 AM   #9
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Re: LF353 (dual channel op-amp) and the circuit @ http://www.national.com/images/pf/LF353/00564939.pdf ... The SoCal Anon1: " ... It could double as a buffer ..."

I might also suggest leaving the first half of the chip, the unity gain stage, outta the circuit altogether, thus eliminating one of those pesky capacitors (and some of the THD) outta the audio signal = modest improvement in the sound.

If the input is directly from a well mannered pre-amp (with little or no DC offset and the gain firmly under control, higher output impedence, etc.), then there only need be a single cap in the audio signal = the single 1.0 uF non-polarized = ... in which case, the op-amp could be one of my favorites (see my avatar image) ...

Re: Costs of op-amps. If you have to ask, you can't afford to use a cheaper one ... Most single channel op-amps cost way less than US$10, dual channel op-amps less than US$12 ... speciality purpose op-amps can cost upwards of US$20 and the higher the cost, the closer they are to either obsolesence or beta development (untested in the field). The main stream op-amps are the ones that work well and cost the least ... IMOP

Any sample op-amp on this page = less than 5 US Bucks : http://www.analog.com/en/prod/0,,759_786_AD825,00.html
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Old 6th March 2007, 02:23 AM   #10
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Interesting as well is this dual version of my avatar image:

http://www.analog.com/Analog_Root/st...ges/AD8599.gif

... the thing is a lavatory grade dual channel op-amp with very, very low noise and it is US$4.25 in quantity !!! ... samples slightly higher

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