Baxandall Eq circuit, any comments?

[Pusch3l]

And your GND goes to Pin3 on the NE5532?

 

[weiss]

And your GND goes to Pin3 on the NE5532?

your schematic is not correct,

Pin 4 is negative Voltage (-15v)
Pin 3 connects to the ground in this type of circuit

Texas Instruments actually show the same layout in their tone control example in the datasheet p. 29 of the lm4562 (same pinout): http://www.ti.com/lit/ds/symlink/lm4562.pdf


In this example, i notived btw. that they use two identical capacitors in the low end, where as i only use one capacitor around VR1 (C1). And this has furthermore no connection to the wiper of the resistor (in their layout it does). Does this make a difference?

 

[Pusch3l]

Give it a try 
Or build the circuit like TI drawn it for testing purpose and see if it makes a difference

 

[weiss]

Give it a try 
Or build the circuit like TI drawn it for testing purpose and see if it makes a difference

I just rebuilt the demo curcuit from TI. Same thing, when i connect the ground from the opamp (+)  to the 0v of the psu the tone control gets disabled, as soon as i disconnect it it is enabled but sound gets distorted (sounds overloaded and crappy). the high boost/cut seems to influence the low end, not the high end...  ???

 

[weiss]

Do i need an input buffer before the tone stack? I thought it should work without.

 

[weiss]

Oh my. It works.

I put a buffer before the tone control and now my problems are all gone!