Hello. Baxandall type tone controlls tend to be 180 degrees inverting so i added another inverting configuration in front to have a total of 0 degrees phase shift between input-output signals.The tone control part is by Mr. Bora Jagodic
http://bas.elitesecurity.org/indexV.html
Is the inverting front part i added ok?
Are resistors R6 and R12 needed?The value commonly used is usually between 22-220R
Waiting for your feedback..🙂
http://bas.elitesecurity.org/indexV.html
Is the inverting front part i added ok?
Are resistors R6 and R12 needed?The value commonly used is usually between 22-220R
Waiting for your feedback..🙂
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Looks OK as long as you realise the input impedance is a low 6k. R12 isn't needed if the layout is good because we can see the load the opamp is working into. R6 is needed because anything could be hung off the end of the final stage.
So what would be a good compromise between R1,R2? Using bigger values such as R1=22K,R2=10K?
It depends on what is driving the stage. If its already another low impedance opamp output then stick with what you have. If its something that is going to struggle driving 6k then you need to scale the values accordingly. You could be feeding it from a valve stage that struggles with 100k loading. Design it to suit your requirements.
Another option is to add a buffer stage at the front end and move the inverting stage to after the tone control.
Another option is to add a buffer stage at the front end and move the inverting stage to after the tone control.
Since you're going to use two op amps, I don't see why you don't cascade the bass and treble controls. In other words, use the first op amp for the treble control and the second for the bass control. It will be much more precise; one control will never affect the response of the other. You will have much more freedom of design this way. Your phase will still be corrected. And it will work better.
Look up Walt Jung's shelving tone controls. So easy to scale and it's worked excellent for decades.
I don't think you need R12 and C2. Also these tone controls need to be driven by a low impedance source; low impedance over the whole audio band. A non inverting buffer serves this purpose well if the previous stage does not meet these requirements.
Look up Walt Jung's shelving tone controls. So easy to scale and it's worked excellent for decades.
I don't think you need R12 and C2. Also these tone controls need to be driven by a low impedance source; low impedance over the whole audio band. A non inverting buffer serves this purpose well if the previous stage does not meet these requirements.
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