Pusch3l

Re: Baxandall Eq circuit, any comments?
« Reply #40 on: June 28, 2019, 02:16:22 AM »
And your GND goes to Pin3 on the NE5532?



weiss

Re: Baxandall Eq circuit, any comments?
« Reply #41 on: June 28, 2019, 05:41:01 AM »
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?
« Last Edit: June 28, 2019, 05:51:01 AM by weiss »

Pusch3l

Re: Baxandall Eq circuit, any comments?
« Reply #42 on: June 28, 2019, 08:27:30 AM »
Give it a try  ;)
Or build the circuit like TI drawn it for testing purpose and see if it makes a difference

weiss

Re: Baxandall Eq circuit, any comments?
« Reply #43 on: June 28, 2019, 12:20:12 PM »
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...  ???
« Last Edit: June 29, 2019, 06:45:26 AM by weiss »

weiss

Re: Baxandall Eq circuit, any comments?
« Reply #44 on: June 29, 2019, 06:45:13 AM »
Do i need an input buffer before the tone stack? I thought it should work without.

weiss

Re: Baxandall Eq circuit, any comments?
« Reply #45 on: June 29, 2019, 09:12:50 AM »
Oh my. It works.

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


 

Related Topics

  Subject / Started by Replies Last post
1 Replies
2573 Views
Last post June 20, 2004, 01:36:04 PM
by JayDee
4 Replies
1870 Views
Last post January 17, 2005, 08:51:52 AM
by
7 Replies
4092 Views
Last post December 21, 2005, 02:08:56 PM
by rodabod
8 Replies
2216 Views
Last post November 26, 2007, 06:57:58 PM
by dale116dot7