Hi I have been playing with this tone control circuit to replace my baxandall tone control. This circuit is designed to cut the bass, mid and treble -26db and to boost them 6db. It works fine however, I want to raise the boost a bit higher than 6db (maybe 12db) so would like to know which resistors I would have to replace. Thanks for you time, any help is much appreciated
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The circuit is strange, I never saw none similar to this, but appears to me that increasing R19 and R35 would be a starting point.
Do you mean AFTER the level is elevated by the first opamp?
The first opamp already has around 47k/8k2=5.7=15.1dB of gain. The second opamp more or less cut both frequency ends and the third opamp notch the midrange.
So if you want more gain, instead of altering the gain of the second and third opamps you can also increase the gain of the first opamp, which is already high.
Strange, if not bad tone control design imo.
Hi thanks for your response, I am happy with the 15db gain on the volume pot, but I just want to be able to boost the actual tone frequencies more than 6db thanks
Oh so you want to boost above volume level...
This depends on the value of your pots. If the resistance on the left of the wiper equal to the resistance on the right, you get 0dB. So to increase gain what you want is to increase the pot (e.g. to 100K) or to lower R22, R17 and R25 to half of it (6k8-->3k3, 5k6-->2k7)
Sorry I dont quit understand what you are saying, all I am trying to do is boost the individual frequencies above 6db, so I want to know which resistors to change without affecting the turnover frequency thanks
I think it is better to design the TC where you can control the pole frequencies ala parametric EQ. Here is a good one from www.sevenwoodsaudio.com
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