king-rb

Davelizer Mastering EQ
« on: June 16, 2010, 09:37:39 AM »
....
« Last Edit: July 18, 2012, 05:40:53 PM by king-rb »


Biasrocks

Re: Davelizer Mastering EQ
« Reply #1 on: June 16, 2010, 11:23:50 AM »
maybe someon already build this and can help me with the values?

From Dave

f=1/(2piRC)

Here's the original thread, with some suggested values.

http://recforums.prosoundweb.com/index.php/mv/msg/29585/0/0/4799/

Mark
« Last Edit: June 16, 2010, 11:28:58 AM by Biasrocks »
http://SharktankPro.com

"I'd rather use an SPX90 than a UA plugin....." Joe Barresi

king-rb

Re: Davelizer Mastering EQ
« Reply #2 on: June 16, 2010, 12:48:01 PM »
...
« Last Edit: July 18, 2012, 05:41:09 PM by king-rb »

Biasrocks

Re: Davelizer Mastering EQ
« Reply #3 on: June 16, 2010, 01:35:30 PM »
thanks for the link. the frequencys swithces are finished but im still missing the values for r2, r3, c3
should i post my frequency choices here?

Those values have nothing to do with your frequency selections. It's for the opamp buffering the input stage and determines the gain of that stage. I'm assuming you'd want unity gain for that stage.

Look here for info on Opamp feedback.

http://www.ecircuitcenter.com/Circuits/opfeedback1/opfeedback1.htm

Mark
http://SharktankPro.com

"I'd rather use an SPX90 than a UA plugin....." Joe Barresi

SIXTYNINER

Re: Davelizer Mastering EQ
« Reply #4 on: June 16, 2010, 01:56:00 PM »
cool project
 8)
>>" 1 Picture say what billions words cannot "<< - >>"SMD Kill the DIY STAR"<<
Why in the  forum  if no share

king-rb

Re: Davelizer Mastering EQ
« Reply #5 on: June 16, 2010, 03:22:46 PM »
is there a way to get the input/output symetrical with the same opamps?

Biasrocks

Re: Davelizer Mastering EQ
« Reply #6 on: June 16, 2010, 04:22:04 PM »
is there a way to get the input/output symetrical with the same opamps?


I'm assuming that this is a single band implementation, you could add additional bands, as many as you want.

It requires some sort of summing/makeup/balancing stage after it.

Study the Sontec project for how to implement this.

You could also use something like this.

http://www.thatcorp.com/1600-series_Balanced_Line_Driver_ICs.shtml

Really, the Daveilizer EQ is not a connect the dots, stuff the components and you're done kind of project.

He gives you enough to get going but you really need to understand all the parts of a functioning EQ that are required to get something like this going.

Mark
« Last Edit: June 16, 2010, 04:34:54 PM by Biasrocks »
http://SharktankPro.com

"I'd rather use an SPX90 than a UA plugin....." Joe Barresi

Tekay

Re: Davelizer Mastering EQ
« Reply #7 on: June 17, 2010, 06:01:02 AM »
Looks like the original uses 3 band in serie. Barry Porter design?
Low = 30, 50, 75, 125, 180, 250
Mid = 400, 600, 800, 1k25, 2k5, 5k
High = 2k, 4k, 8k, 12k, 16k, 20k
Broadband
Thomas "TK" Kristiansson
----------------------------------
"The Sound Is In The Iron"
www.vintagedesign.se  www.tkaudio.se

king-rb

Re: Davelizer Mastering EQ
« Reply #8 on: June 17, 2010, 09:51:23 AM »
...
« Last Edit: July 18, 2012, 05:41:32 PM by king-rb »

duende

Re: Davelizer Mastering EQ
« Reply #9 on: March 12, 2021, 12:44:24 PM »
Hi,

I'm planning to build this project but i have some doubts...

The first buffer opamp is needed per additional band or it's just an input buffer for the circuit ?

I don't understand the gain resistors values, is there a method to calculate this resistors ?

The junction at R19/R7/R9 is not like R21/R18/R8, is it  due to the gain "curve" ( log , rev log ?) or it's an schematic error ?

Thanks.


Gold

Re: Davelizer Mastering EQ
« Reply #10 on: March 12, 2021, 01:03:25 PM »
Looks like the original uses 3 band in serie. Barry Porter design?

It’s a Wein bridge design not an SVF.

duende

Re: Davelizer Mastering EQ
« Reply #11 on: March 12, 2021, 01:49:33 PM »
It’s a Wein bridge design not an SVF.

Hi Gold, can you you tell me more on this circuit ?

Hi,

I'm planning to build this project but i have some doubts...

The first buffer opamp is needed per additional band or it's just an input buffer for the circuit ?

I don't understand the gain resistors values, is there a method to calculate this resistors ?

The junction at R19/R7/R9 is not like R21/R18/R8, is it  due to the gain "curve" ( log , rev log ?) or it's an schematic error ?

Thanks.

Gold

Re: Davelizer Mastering EQ
« Reply #12 on: March 12, 2021, 02:34:48 PM »
Hi Gold, can you you tell me more on this circuit ?

I haven't studied it. It's a fixed bandwidth Wein Bridge EQ with the bands in series. I know Dave built it with a wide bandwidth as a general tone shaper. Not a surgical EQ.

duende

Re: Davelizer Mastering EQ
« Reply #13 on: March 12, 2021, 04:44:10 PM »
I haven't studied it. It's a fixed bandwidth Wein Bridge EQ with the bands in series. I know Dave built it with a wide bandwidth as a general tone shaper. Not a surgical EQ.

Thanks!

Gold

Re: Davelizer Mastering EQ
« Reply #14 on: March 12, 2021, 07:03:58 PM »
The only other thing I remember is him saying he used a 5532 “just to piss everyone off”

pucho812

Re: Davelizer Mastering EQ
« Reply #15 on: March 14, 2021, 08:25:54 PM »
Does anyone have this schematic?
You tell me whar a man gits his corn pone, en I'll tell you what his 'pinions is.


 

Related Topics

  Subject / Started by Replies Last post
14 Replies
6782 Views
Last post July 01, 2004, 06:17:58 AM
by Michael Krusch
13 Replies
2880 Views
Last post May 20, 2005, 09:55:32 PM
by Crusty2
15 Replies
7046 Views
Last post September 03, 2008, 12:25:39 PM
by khstudio
4 Replies
2203 Views
Last post February 16, 2007, 03:56:37 AM
by ChrioN