Subwoofer Filter PCB with LFE sensing, EQ sections, 12/24 dB LR cutoff - Page 13 - diyAudio
Go Back   Home > Forums > Commercial Sector > Group Buys

Group Buys Members group buys

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 19th May 2012, 10:40 AM   #121
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
Quote:
Hello all,

Here is a LTSpice model for the following filter sections: summing circuit, 4th order Linkwitz Riley filter, 1 EQ section configured as notch filter, Linkwitz Transform section, Allpass section (phase) and an output buffer with volume control.

summing+LR4th+Notch+LTransform+allpass+volbuf.asc

-Simulation from 20-100Hz with 100 sample points/decade
I started building my board but are not to skilled with LTSpice.
If I follow the "Bill of materials" in LTSpice with your model do
i get the standard variable 20-100Hz filter?
__________________
Music is the only art in real time....
  Reply With Quote
Old 19th May 2012, 04:51 PM   #122
APK is offline APK  United Kingdom
diyAudio Member
 
Join Date: Jan 2005
Location: NW
Hi Mayday

PM Sent
  Reply With Quote
Old 19th May 2012, 05:41 PM   #123
Mayday is offline Mayday  Sweden
diyAudio Member
 
Join Date: Mar 2004
Location: Sweden
My boards are sold, they went fast.
As I have a working, but maybe not optimal, solution today, an active x-over for my woofers will have to wait.
__________________
The more you learn, the more you realize how little you know...
Mayday DIY blogg
  Reply With Quote
Old 24th May 2012, 06:21 AM   #124
presbel is offline presbel  Philippines
diyAudio Member
 
Join Date: Sep 2006
Send a message via Yahoo to presbel
Got my boards yesterday. Thanks
  Reply With Quote
Old 24th May 2012, 08:46 AM   #125
Mfly is offline Mfly  Netherlands
diyAudio Member
 
Join Date: Feb 2008
Location: Utrecht
Quote:
Originally Posted by Solve View Post
I started building my board but are not to skilled with LTSpice.
If I follow the "Bill of materials" in LTSpice with your model do
i get the standard variable 20-100Hz filter?
Sorry for the late response. Been busy . However:

In LTSpice I believe R400, R401, R402, R403 are now 130kOhm? That would result in a filter frequency of ~26Hz. Fill in other values for R4xx and the frequency will change. If you follow the BOM, R4xx is composed of a 30k resistor plus the value of the potentiometer (0kOhm - 100kOhm). This will give you a range of 26Hz (@ 130kOhm) to 113Hz (@ 30kOhm). You can change the range for example from 24Hz to 85Hz by putting in 40kOhm resistors at R4xx.

In LTSpice you have to change the values of the R4xx resistors manually to change the crossover frequency. You can use the calculator at the bottom of the page of project 09 from Elliott Sound Products to easily calculate these values for any given crossover frequency.

Hope this helps!
  Reply With Quote
Old 25th May 2012, 05:01 PM   #126
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
Thanks!That sure helped.
__________________
Music is the only art in real time....
  Reply With Quote
Old 27th May 2012, 03:15 PM   #127
Mfly is offline Mfly  Netherlands
diyAudio Member
 
Join Date: Feb 2008
Location: Utrecht
Dear all,

I finished my build and got the sensing circuit working as well. Man, I'm glad everything works . Which brings me to the following:

The library part I used for the mosfet in the sensing circuit (Q1) has another pinout than the ZVN4210A part (and the BS170 and BS270 have yet another pinout). So you'll have to swap the pins. When looking at the silkscreen with the potentiometers at the bottom; the left pin is 'source', the middle pin 'drain' and the right pin 'gate'. So for the ZVN2410 you'll have to swap the middle and the right pin. The BS parts you'll have to put in the other way (turn them 180 degrees) and swap the same pins. So please have a good look at the pinout of the device you're using!

Another thing: Because the solder pads are small and the hole diameters are small as well, desoldering of parts is quite the challenge. So if you are not sure about component values (e.g. for the equalizer sections), I would recommend soldering in sockets to place your components. This prevents some frustation when you have to swap parts. These for example: 01-0513-11H Aries IC & Component Sockets

Happy soldering!

Last edited by Mfly; 27th May 2012 at 03:24 PM.
  Reply With Quote
Old 27th May 2012, 03:23 PM   #128
Mfly is offline Mfly  Netherlands
diyAudio Member
 
Join Date: Feb 2008
Location: Utrecht
And one other thing:

The momentary switch to release the relay in the sensing circuit (S2) is designed for a 'toggle' type momentary switch (switching between two poles). The part I'm using (and is in the BOM) is a single pole however. To make this work just solder a bridge (or connect another way) between pole 2 and 3 (middle and right pins viewed from the top). Don't forget to do this, otherwise the circuit will never release automatically.
  Reply With Quote
Old 8th June 2012, 06:07 PM   #129
Solve is offline Solve  Sweden
diyAudio Member
 
Solve's Avatar
 
Join Date: May 2006
I started to build mine, but if i dont want to use any S3 switch, do i bridge 1-3 and 4-6?
And where are the hole numbers?
__________________
Music is the only art in real time....
  Reply With Quote
Old 11th June 2012, 11:29 AM   #130
Mfly is offline Mfly  Netherlands
diyAudio Member
 
Join Date: Feb 2008
Location: Utrecht
Quote:
Originally Posted by Solve View Post
I started to build mine, but if i dont want to use any S3 switch, do i bridge 1-3 and 4-6?
And where are the hole numbers?
There are no hole numbers on the silk screen, my apologies for this. You can have a look at the schematic. When not using S3; connect 1+2 and 4+5 for a 0-180 degrees section and connect 2+3 and 5+6 for a 180-360 degrees section. Looking with the potmeters at the 'bottom' and silkscreen on top:

1=top right
2=middle right
3=bottom right
4=top left
5=middle left
6=bottom left
  Reply With Quote

Reply


Hide 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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Subwoofer input+filter+eq circuit zeus_threat Subwoofers 13 6th January 2013 09:13 PM
Subwoofer filter with sensing LFE switch Mfly Analog Line Level 5 26th November 2010 02:54 PM
12 dB enough for subwoofer lowpass filter? JanErik Analog Line Level 0 2nd September 2010 09:41 AM
240 watt, 24-db filter plate amps audiokinesis Swap Meet 3 11th September 2008 07:24 PM
I know 12 and 24 db/oct but punchpeanut Parts 4 5th September 2003 05:49 PM


New To Site? Need Help?

All times are GMT. The time now is 02:03 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright 1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2