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

Multi-Way Conventional loudspeakers with crossovers

Help Drawing a Schematic
Help Drawing a Schematic
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 4th September 2017, 03:16 AM   #1
ouimetnick is offline ouimetnick  United States
diyAudio Member
 
Join Date: May 2011
Location: Beverly, Massachusetts, USA
Send a message via AIM to ouimetnick Help Drawing a Schematic
Default Help Drawing a Schematic

Can someone help me with drawing a schematic for my Boston Acoustics VR-M60? BA doesn't share schematics unfortunately, and I'd like to see this crossover in schematic form to get a better idea of what components do what.

I tried and got very discouraged based on the number of components and things in parallel, but then seem to be crossing over to the other side (it's a bi wired design)

I'm trying to gain a full understanding of the circuit and what component does what, etc.

I tried tracing the board, and still got confused trying. Anyone else good at this?

At the end, I want to have 2 "separate" crossovers. 1 for the high and 1 for the low. Not 2 separate physical crossovers, just schematics if possible.
Attached Images
File Type: jpg Screen Shot 2017-08-05 at 12.46.21 AM.jpg (186.5 KB, 155 views)
File Type: png VR-M60 Front.png (381.3 KB, 152 views)
File Type: png VR-M60 Foil Side.png (501.0 KB, 148 views)
File Type: jpg IMG_9986.jpg (607.9 KB, 146 views)
File Type: jpg IMG_9988.jpg (651.5 KB, 146 views)
File Type: jpg IMG_9991.jpg (708.8 KB, 45 views)
  Reply With Quote
Old 4th September 2017, 04:27 AM   #2
eriksquires is offline eriksquires  United States
diyAudio Member
 
eriksquires's Avatar
 
Join Date: May 2013
First, try using XSim. I like it and it is simple.

Next, try this link:

A Speaker Maker's Journey: Crossover Basics

It will also help you that in general, the smallest caps will be going to the tweeter, the largest caps on the woofer.


Best,


E
__________________
All of my successes and failures can be explained by my attempts at getting a girlfriend. All of them.

Last edited by eriksquires; 4th September 2017 at 04:29 AM.
  Reply With Quote
Old 4th September 2017, 05:48 AM   #3
tuantran is offline tuantran  Canada
diyAudio Member
 
tuantran's Avatar
 
Join Date: Jun 2011
Location: Ottawa
Here you go.
Attached Images
File Type: png Boston-Acoustics-VR-M60-XO.png (21.6 KB, 38 views)
  Reply With Quote
Old 4th September 2017, 11:42 AM   #4
4real is offline 4real  Netherlands
diyAudio Member
 
Join Date: May 2004
Location: Steyl
Help Drawing a Schematic-schematic-png

That should make it easy
Attached Images
File Type: png schematic.png (395.3 KB, 153 views)
__________________
Do diamonds shine on the dark side of the moon?
  Reply With Quote
Old 4th September 2017, 05:07 PM   #5
ouimetnick is offline ouimetnick  United States
diyAudio Member
 
Join Date: May 2011
Location: Beverly, Massachusetts, USA
Send a message via AIM to ouimetnick Help Drawing a Schematic
That you both for the help. Itís amazing how quickly you guys respond.

4real, how did you over lay the foil side on the component side?

Tauntran, how were you able to follow the traces and draw the schematic? Iím able to draw basic schematics from basic board layouts, but this had things crossing over each other, and things things I thought were for the tweeter were tracing to the wooferís input, etc and I became discouraged.

Thanks guys!!
  Reply With Quote
Old 4th September 2017, 06:04 PM   #6
tuantran is offline tuantran  Canada
diyAudio Member
 
tuantran's Avatar
 
Join Date: Jun 2011
Location: Ottawa
Ouimetnick, It took me 30 minutes to draw the schematic. It's fun to do something like this.
  Reply With Quote
Old 4th September 2017, 06:30 PM   #7
eriksquires is offline eriksquires  United States
diyAudio Member
 
eriksquires's Avatar
 
Join Date: May 2013
So, it seems parts are numbered from the woofer side, not the tweeter and I labelled my parts accordingly. They will be different from yours.

C1/R1/L1 form a baffle step compensation circuit (BSC) while L1 forms the traditional first pole of the low pass filter.

C3/L3/C4/L4 form a traditional fourth order high pass filter. There are additional components doing some frequency shaping. R2 and C5 are a little unusual. Of course, I could have misread much.

R3 appears to be there just to keep L3 from showing a dead short to ground, and is a typical solution.

Help Drawing a Schematic-boston-acoustics-jpg
Attached Images
File Type: jpg Boston Acoustics.jpg (63.4 KB, 114 views)
__________________
All of my successes and failures can be explained by my attempts at getting a girlfriend. All of them.
  Reply With Quote
Old 4th September 2017, 06:57 PM   #8
eriksquires is offline eriksquires  United States
diyAudio Member
 
eriksquires's Avatar
 
Join Date: May 2013
Here is the XSim file in case you are interested. I'm sure I made mistakes, so feel free to correct, and enhance with actual part values.
Attached Files
File Type: zip BA_VR-M60.zip (1.5 KB, 1 views)
__________________
All of my successes and failures can be explained by my attempts at getting a girlfriend. All of them.
  Reply With Quote
Old 4th September 2017, 07:04 PM   #9
kevinkr is offline kevinkr  United States
diyAudio Moderator
 
kevinkr's Avatar
 
Join Date: Sep 2004
Location: Boston, Massachusetts
Help Drawing a Schematic
R3/L3 form a step network.
__________________
"To argue with a person who has renounced the use of reason is like administering medicine to the dead." - Thomas Paine
  Reply With Quote
Old 4th September 2017, 08:30 PM   #10
4real is offline 4real  Netherlands
diyAudio Member
 
Join Date: May 2004
Location: Steyl
Quote:
Originally Posted by ouimetnick View Post
4real, how did you over lay the foil side on the component side?
Just some basic Photoshop masking, flipping and blending. Actually you did most of the hard work by providing so perfectly aligned images 😜
__________________
Do diamonds shine on the dark side of the moon?
  Reply With Quote

Reply


Help Drawing a SchematicHide 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
Templates for schematic drawing tom31415926 Everything Else 2 18th March 2008 04:05 PM
Schematic Drawing Software wiredmonkey Solid State 20 19th September 2007 03:12 PM
schematic drawing software steven344 Everything Else 12 22nd December 2005 09:41 AM
schematic drawing kaukasion Solid State 15 28th January 2004 09:21 PM
Schematic drawing vacuumhead Everything Else 6 29th March 2003 07:33 PM


New To Site? Need Help?

All times are GMT. The time now is 11:17 PM.


Search Engine Optimisation provided by DragonByte SEO (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Resources saved on this page: MySQL 14.29%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2020 DragonByte Technologies Ltd.
Copyright ©1999-2020 diyAudio
Wiki