Go Back   Home > Forums > >
Home Forums Rules Articles diyAudio Store Blogs Gallery Wiki Register Donations FAQ Calendar Search Today's Posts Mark Forums Read

Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

MOX - active crossover
MOX - active crossover
Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 1st March 2004, 05:13 PM   #111
Andypairo is offline Andypairo  Italy
diyAudio Member
 
Andypairo's Avatar
 
Join Date: Sep 2002
Location: near Milano , Italy
I'm also desiring a simpler crossover than what Jens is proposing, and moamp's design fits my needs (and not only mine it seems...)

IMHO there should be a thread-splitting, since this one is named "MOX", and the discussion is getting too distant from the original topic.

Among all those who are interested in building moamps' design, is there anyone willing to organize a PCB run?

Cheers

Andrea
  Reply With Quote
Old 1st March 2004, 06:58 PM   #112
Jan Dupont is offline Jan Dupont  Denmark
diyAudio Member
 
Jan Dupont's Avatar
 
Join Date: Apr 2003
Location: Copenhagen, Denmark
Send a message via MSN to Jan Dupont
Thumbs down gratatu

I have been following this thread with great interest from the beginning.
Who on this thread are trying to make a profit ????????????
If you post accusations, then please also put the receivers name in it!
We are many on diyaudio, who offers our circuits, layouts and help for free, - just for the fun of making diy-audio........
__________________
Free Schematic and Service Manual downloads www.audio-circuit.dk
  Reply With Quote
Old 1st March 2004, 07:46 PM   #113
Blitz is offline Blitz  Germany
diyAudio Member
 
Join Date: Nov 2002
Location: Cologne, Germany
I understand this as well as a non-profit-project and I have not seen any prices for pcbs yet which would indicate that anyone wants to make money out of it.

A commerical product which seems to fit quite the spec-pack is http://www.borbelyaudio.com/xover.pdf where you can get as well pcbs only: Discrete class a opamps, configurable between 6db-18db, input and outputbuffer and regulator (this one could be better) on board...more or less all we asked for and a nice outlook how the boards of the MOX could look like.

By the way: what do you guys think about that one ?
  Reply With Quote
Old 1st March 2004, 07:56 PM   #114
Fred Dieckmann is offline Fred Dieckmann  United States
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Default The usual CATastrophe

This is getting surreal, and as entertainment it's great. As for useful progress ............. well, it's sort of trying to herd cats.

All the information on filter Qs and equal value Sallen Key topology has been discussed in a few threads on the forum. When every one gets done running in circles I would suggest someone design a modular system built around a second order HP and LP filter section with a follower input to isolate the filter response from a level control. Design it for an 8 pin dip and make a discrete op amp module with an 8 pin DIP mounting legs (and a ground terminal to carry ground to the discrete op amp board). I would do SMT op amps with a DIP adapter and I seem to remember some that were quite reasonable in price (Brown Dog?). A buffered op amp could be built on a similar modular PCB. Leave about 4 square inches around the DIP connector on the main board for clearance.

SOMEONE GET FLUFFY BEFORE THE ARM FALLS OFF THAT COUCH !!!
Attached Images
File Type: jpg fat_cat.jpg (10.5 KB, 1405 views)
  Reply With Quote
Old 1st March 2004, 08:05 PM   #115
jam is offline jam  United States
diyAudio Member
 
jam's Avatar
 
Join Date: May 2001
Location: Auburn, CA, USA
Fred,

This brings back fond memories of the good old days..............

JOCKO'S Dog.
Attached Images
File Type: jpg dog.jpg (31.6 KB, 1425 views)
  Reply With Quote
Old 1st March 2004, 08:10 PM   #116
JOE DIRTŪ is offline JOE DIRTŪ  Canada
diyAudio Member
 
JOE DIRTŪ's Avatar
 
Join Date: Apr 2003
Location: Brantford, ON
LMAO Fred....you really get anal when you want to.....I keep it suddle
a modular approach is good for a new design but for the final approach a one board solution is the way to go in respect to sound quality

DIRTŪ
  Reply With Quote
Old 1st March 2004, 08:16 PM   #117
Fred Dieckmann is offline Fred Dieckmann  United States
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Angry Where there's smoke there is fire

Jocko would never allow smoking (I saw him get into someones face big time for smoking at the table next to us) and I don't think he's fond of dogs......

Here's a picture of his last cat though.
Attached Images
File Type: jpg drunk-cat.jpg (7.6 KB, 1382 views)
  Reply With Quote
Old 1st March 2004, 08:28 PM   #118
Fred Dieckmann is offline Fred Dieckmann  United States
diyAudio Retiree
 
Join Date: Oct 2002
Location: Spain or the pueblo of Los Angeles
Default There's one in every crowd

Quote:
Originally posted by JOE DIRTŪ
LMAO Fred....you really get anal when you want to.....I keep it suddle
a modular approach is good for a new design but for the final approach a one board solution is the way to go in respect to sound quality

DIRTŪ
You can always solder the machine pins from the adaptor to the board

Gold pin headers and machine sockets sound pretty decent ........ be sides how am I going to sell everyone a new amp module every 6 months. I think some of front ends of Mr. Pass X amps are modular.
Attached Images
File Type: jpg x150inside.jpg (22.3 KB, 1424 views)
  Reply With Quote
Old 1st March 2004, 08:44 PM   #119
JensRasmussen is offline JensRasmussen  Denmark
diyAudio Member
 
JensRasmussen's Avatar
 
Join Date: Jul 2002
Location: Denmark - Jutland
Send a message via ICQ to JensRasmussen Send a message via MSN to JensRasmussen
Default opamp

Hi,

could the be to everyones liking?

The two opamps are placed under a socket for a larger IC, this could connect up to the descrete opamp module.
Attached Images
File Type: gif opamp.gif (3.2 KB, 1371 views)
  Reply With Quote
Old 1st March 2004, 11:52 PM   #120
BDP is offline BDP  United States
diyAudio Member
 
Join Date: Apr 2002
Location: SE Washington State
Quote:
Guess I will second the opinion that I'd prefer to stay pretty much with Moes design principles in this project...
I would agree, stay with the MOX design. I'm planning on using a different buffer input and probably Borbleys balanced line output to each section. If my speaker project will permit I would prefer to only use 6 dB filter slopes and not use a MOX active filter, but in case I can't then I would use one of the MOX filters for 12 dB.

The modular approach MOAMPS has designed fits my needs best.

BDP
  Reply With Quote

Reply


MOX - active crossoverHide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
active crossover: fir vs iir netchris Everything Else 3 29th July 2008 09:14 AM
Passive crossover into active crossover hahfran Multi-Way 16 10th February 2008 06:16 PM
PA vs DIY active crossover paulspencer Multi-Way 46 27th November 2004 01:25 AM
active crossover aaronboumans Analogue Source 4 31st May 2003 04:59 PM
XVR1 active crossover, discrete active stage promitheus Pass Labs 18 22nd July 2002 01:29 AM


New To Site? Need Help?

All times are GMT. The time now is 11:29 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 15.00%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2018 DragonByte Technologies Ltd.
Copyright ©1999-2018 diyAudio
Wiki