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Old 22nd October 2009, 01:08 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, 04:13 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, 04:58 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, 05:56 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, 06:29 PM   #5
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Quote:
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, 02:05 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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