The Electrician
Active Member
In another thread, audioguru posted an example of a Baxandall tone control circuit with bass, midrange and treble controls. Also included was a graph of the response of the three controls at full boost, full cut and flat.
An analysis of the circuit performance does not verify the graphs. The main problem is that the treble performance is not as portrayed.
Here is the circuit and graph plus an analysis of the actual circuit performance. My analysis shows more than just full boost and cut. I have shown the responses with each control varied in 10% steps from one end to the other of the potentiometer range.
The problem with the treble response is clearly seen.
Capacitor C2 is too small; with only 1 μF there is a db or so rolloff at the lowest bass, so I changed it to 10 μF for my analyses.
In the next thread I'll deal with the treble problem.
An analysis of the circuit performance does not verify the graphs. The main problem is that the treble performance is not as portrayed.
Here is the circuit and graph plus an analysis of the actual circuit performance. My analysis shows more than just full boost and cut. I have shown the responses with each control varied in 10% steps from one end to the other of the potentiometer range.
The problem with the treble response is clearly seen.
Capacitor C2 is too small; with only 1 μF there is a db or so rolloff at the lowest bass, so I changed it to 10 μF for my analyses.
In the next thread I'll deal with the treble problem.
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