Hopefully some one with a little more knowledge about these things will be able to answer my question(s)
The image is from the appnote for the LM833 chip. It shows a variation of the Baxendal tone control and the design formulas. However when using the shown values with the equations as shown I do not get the same results.
When using formulas I had: C values are in Farads, Resistors in Kohms ie. C1 5E-8, C2 5E-9, R1 1.1E4, R2 1.0E5, R3 1.1E4, R5 3.6E3
results (stated results in brackets)
Fl 31.83099 Hz - close enough (32Hz)
FlB 289.3726 Hz - (320Hz)
Fh 8841.9413 Hz - not close (11kH)
fhB 869.69914 Hz - not close (1.1 kH)
Am I doing something wrong? Are there some series or parallel relationships to be taken into consideration? Or is there a little poetic license being used by the Appnote writer when stating the response values for the given component values?
Can someone point me to a web page that has better equations of a description of how to design a Baxendal tonestack from the ground up.
All I wanted to do was to change the response from the traditional HiFi values (1kHz cross over frequency) to guitar values bass frequency around 150Hz and Treble around 5kHz...
Yes I know about the tonestack calculator, but I wanted to learn a little about the circuit, not just plug in some values.
Any recommendations and suggestions (please keep it clean ) and advice would be gratefully recieved