Purusha

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #40 on: January 13, 2007, 04:39:05 AM »
Quote
My goal is to basically build the "AIR" band & share it with the group.


Why not the whole thing?
Regards as always, Purusha


khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #41 on: January 18, 2007, 01:34:20 AM »
Deleted
« Last Edit: February 14, 2010, 04:17:31 PM by khstudio »
Kevin ~ KHStudio

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #42 on: January 18, 2007, 03:10:02 AM »
Deleted
« Last Edit: February 14, 2010, 04:17:46 PM by khstudio »
Kevin ~ KHStudio

Purusha

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #43 on: January 18, 2007, 06:13:31 AM »
Quote
The schematic I'm making (for now) will only be the fixed 2.5k band & the switchable shelf = 5k, 10k, 20k, 40k.


Kevin, not bad idea at all  :thumb:

Maybe I could make some nice 2U cases for 8ch. of 2.5k band & the switchable shelf = 5k, 10k, 20k, 40k. We could organize some PCBs order and have a group buy. I know how this AIR sounds and I liked it from the first moment I heard it.
Regards as always, Purusha

Purusha

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #44 on: January 18, 2007, 06:16:33 AM »
Although the SUB part sound very usefull too.
Regards as always, Purusha

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #45 on: January 18, 2007, 07:04:26 AM »
Quote from: "Purusha"
Although the SUB part sound very usefull too.


Yeah, the sub DOES sound very good :sad:

Damn you :green:

K
Kevin ~ KHStudio

Purusha

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #46 on: January 18, 2007, 07:13:48 AM »
Let's do the SUB as well  :green:

8channels of 3 band  :thumb:
Regards as always, Purusha

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #47 on: January 18, 2007, 11:12:35 PM »
Deleted
« Last Edit: February 14, 2010, 04:18:16 PM by khstudio »
Kevin ~ KHStudio

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #48 on: January 19, 2007, 12:21:13 AM »
Deleted
« Last Edit: February 14, 2010, 04:19:05 PM by khstudio »
Kevin ~ KHStudio

clintrubber

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #49 on: January 19, 2007, 04:08:35 AM »
Quote from: "khstudio"

I may start breadboarding just the "air" band tonite.

QUESTION:
I mentioned a few times that the circuit is parallel = 1 is the raw signal & the other EQ - the EQ pots are summed using 5.62k resistors (6 TOTAL) If I ONLY build just the "AIR" band I won't need all the summing resistors :?  BUT, won't that change the impedence :?: And how should I compensate or do I even need to :?:  :?:  :?:

Thanks,
Kevin


I'm not familiar with the exact functionality of this unit (a pic of the frontpanel would be nice, couldn't find a decent one).
But let's try: OK, so there's one 'dry' path to an output-summer and several parallel paths doing a certain frequency band ? If you only want one then no corrections needed I'd say. Since this is a pile of opamps doing filtering & summing all will be 'independent' I assume.
So just try it, I expect it'll just work.

Nice work !

Bye,

  Peter


khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #50 on: January 19, 2007, 10:22:14 AM »
Deleted
« Last Edit: February 14, 2010, 04:21:14 PM by khstudio »
Kevin ~ KHStudio

Greg

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #51 on: January 19, 2007, 10:55:23 AM »
Nice work khstudio. I'm gonna take look over this the next few days.

One thing I noticed, and it's very, very minor. It looks like you used the resistor symbol for the inductors L1 and L2. Look for a symbol that looks like a coil... looks like the primary or secondary side of a transformer symbol.

 :guinness:
Greg Stein
New Orleans, LA

clintrubber

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #52 on: January 19, 2007, 10:57:22 AM »
Thanks for posting this  :thumb:

Is the sum-collection-point at the top-side of R31 (@U5) ? Label might be missing.
edit: no wait, I see 'EQ-sum'. But what's U5 doing ?

Cheers,

  Peter

peterc

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #53 on: January 19, 2007, 03:45:12 PM »
Kevin

Check your email, I've updated a lot of the parts & the schematic.

I think U5 should be an inverting amp.

Peter
If opportunity doesn't knock, build a door.

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #54 on: January 19, 2007, 06:13:09 PM »
I'm in a session right now after getting about 4 hours sleep :sad:

Please post all the questions you want & I'll be back in a few hours.

I am aware that some corrections are needed.

Greg, I'll fix the inductor :thumb:

« Last Edit: February 14, 2010, 04:21:52 PM by khstudio »
Kevin ~ KHStudio

nielsk

do it all, baby
« Reply #55 on: January 19, 2007, 07:47:46 PM »
This is a great EQ, it's the poor mans GML. Leaving out the other bands would be a mistake! Please see it through and do a full unit, I have wanted one of these for a long time and would love to be able to build myself one.

okgb

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #56 on: January 19, 2007, 08:30:31 PM »
Massenburg had said i believe that he put his bands in paralell
becuase it sounded better although it limited the max boost
 I have a schemo someone had made without the servos

Nice work KH
GKB Audio / Greg Boboski

peterc

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #57 on: January 20, 2007, 02:15:15 AM »
Here is an updated version with my idea of U5 - I'm open to correction....

DELETED

Changed some of the resistor values to match those on the PCB.

Quote
The stranges thing I can't figure out is the 2.5k on the high shelf & the switchable one don't seem to be using the same cap values...check it out please... but it is right.

I think they have done this to get different Q's.

I've simulated the values & they seem good for the bell bands, never sure of where the effective freq is for a shelf. The shelf EQ's are in the right ballpark though.
« Last Edit: February 15, 2010, 01:37:17 AM by peterc »
If opportunity doesn't knock, build a door.

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #58 on: January 20, 2007, 02:48:40 AM »
x
« Last Edit: February 14, 2010, 04:37:16 PM by khstudio »
Kevin ~ KHStudio

khstudio

3D "AIR" EQ - "Night EQ" PCB's Complete!
« Reply #59 on: January 20, 2007, 04:19:29 AM »
x
« Last Edit: February 14, 2010, 04:37:05 PM by khstudio »
Kevin ~ KHStudio


 

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