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Old 22nd October 2009, 02:08 PM   #1
mckvak is offline mckvak  Czech Republic
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Default Baxandall tone control circuit

Hi all. I look for a Baxandall tone control circuit, which can control bass and treable on 20dB or more. My english is not good I know sorry
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Old 22nd October 2009, 05:13 PM   #2
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Quote:
Originally Posted by mckvak View Post
Hi all. I look for a Baxandall tone control circuit, which can control bass and treable on 20dB or more. My english is not good I know sorry
Hi

Your English is good enough:
I hope this helps.

Max bass boost = (R1+R2) / R1

Max bass cut = R1 / (R1+R2)

Max treble boost = (R5+R1+2*R3) / R5

Max treble cut = R5 / (R5+R1+2*R3)

R4 shall be larger or equal to 10*(R5+R1+2*R3)

R2 shall be much larger than R1


In the example circuit:

Max bass boost = 20*log ((11k+100k)/11k) = 20dB

Max bass cut = 20*log (11k / (11k+100k)) = - 20dB

Max treble boost = 20*log ((3.6k+11k+2*11k) / 3.6k) = 20dB

Max treble cut = 20*log (3.6k / (3.6k+11k+2*11k)) = -20dB
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Old 22nd October 2009, 05:58 PM   #3
mckvak is offline mckvak  Czech Republic
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It look easier than it seem. Is possible use transistor on the way out, because operations amplifier and another integrate circuit is not allow for my poject.
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Old 22nd October 2009, 06:56 PM   #4
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additional informations and weblinks you can find here:
need equation for 3 band baxandall equalizer
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Old 22nd October 2009, 07:29 PM   #5
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Originally Posted by mckvak View Post
It look easier than it seem. Is possible use transistor on the way out, because operations amplifier and another integrate circuit is not allow for my poject.
Hi mckvak

Yes it is possible to use transistors instead of an opamp.

Maybe you should post the circuit you have made so far, that you would like to use the tone control with. If you have a gain stage maybe you should try to implement the tone control around that stage, or you could use a passive tone control.

stinius
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Old 23rd October 2009, 03:05 PM   #6
mckvak is offline mckvak  Czech Republic
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This is the circuit. But way out sign as REC out I will not use

Click the image to open in full size.
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Old 19th February 2013, 10:21 PM   #7
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There are diagrams where instead of R5 is a capacitor let's say about 1.8 or 3.3nF in series with the treble potentiometer and even if instead of C2 in some diagrams appears a fix rezistor. How can you calculate in this case? Another diagrams omit even R5 and the treble potentiometer (R4) is connected directly in paralel with R1-R2-R1. Which is the formula for this case? Thank you!
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Old 19th February 2013, 10:28 PM   #8
tinitus is offline tinitus  Europe
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today there are fine calculators for that

on Duncan Amps site ?
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Old 19th February 2013, 10:31 PM   #9
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With that calculator you can calculate for passive Baxandall. I heard that a capacitor has a reactance.. Let's say 100nF ~ 6.8K rezistor..

How is modified the formula for the casese when there are capacitors?
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Old 13th April 2013, 11:18 PM   #10
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Update : Active Baxandall calculator (online soft) Active BAXANDALL
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