DCAudioDIY.com

DC Area Audio DIYer's Community
It is currently March 31st, 2023, 2:05 pm

View unanswered posts | View active topics


Board index » DCAudioDIY Main » Project Discussions

All times are UTC - 5 hours [ DST ]



Post new topic Reply to topic  Page 1 of 2
  [ 15 posts ]  Go to page 1, 2  Next
  Print view Previous topic | Next topic 
Author Message
Pelliott321
 Post subject: Best practices
PostPosted: April 12th, 2022, 10:23 am 
Offline
User avatar

Joined: January 15th, 2015, 7:19 am
Posts: 1653
Location: Baltimore MD
I want to rebuild the crossovers in the RAZZ. The boards I have were from a prototype that I have upgraded as changes were made like the recent inductor upgrade.
I never liked the construction techniques originally used and accepted them because it was a prototype that I purchased at a very low price.
The drivers have never changed.
It is the wiring that has me concerned.
There are four types of connections.
14ga solid copper to 14ga stranded
14ga solid copper to 14ga solid copper
14ga stranded to 14ga stranded.
The padding resistors need to be easily removable and originally the leads were just wrapped around metal screws and tightened down against a ring terminal crimped to a 14ga stranded wire to the rest of the crossover. I need to find high-quality ring terminals for the resistors and make a good quality connection to the rest of the crossover.
Top
 Profile  
 
SoundMods
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 10:37 am 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1620
Location: Parkville, Maryland
Pelliott321 wrote:
I want to rebuild the crossovers in the RAZZ. The boards I have were from a prototype that I have upgraded as changes were made like the recent inductor upgrade.
I never liked the construction techniques originally used and accepted them because it was a prototype that I purchased at a very low price.
The drivers have never changed.
It is the wiring that has me concerned.
There are four types of connections.
14ga solid copper to 14ga stranded
14ga solid copper to 14ga solid copper
14ga stranded to 14ga stranded.
The padding resistors need to be easily removable and originally the leads were just wrapped around metal screws and tightened down against a ring terminal crimped to a 14ga stranded wire to the rest of the crossover. I need to find high-quality ring terminals for the resistors and make a good quality connection to the rest of the crossover.

There are many ways to "skin this cat." You can create your own custom PC boards, or use perforated boards, or (my favorite) use turret boards.


Attachments:
turret board.jpg
turret board.jpg [ 192.33 KiB | Viewed 2984 times ]

_________________
Walt
Top
 Profile  
 
Pelliott321
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 11:40 am 
Offline
User avatar

Joined: January 15th, 2015, 7:19 am
Posts: 1653
Location: Baltimore MD
might work
but it would change the layout completely.
I think it would require longer leads, which I am trying to avoid.
Top
 Profile  
 
SoundMods
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 12:02 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1620
Location: Parkville, Maryland
Pelliott321 wrote:
might work
but it would change the layout completely.
I think it would require longer leads, which I am trying to avoid.

I don't think longer leads will matter much. You were talking about 14-gauge wire which only equates to about .0025-ohms/foot. You would have to have 400-foot lengths before you even reached 1-ohm.

I am much more concerned with insulation and conductor quality. Any passive crossover work I have done for myself and others I have used silver-clad copper wire with Teflon dielectric.

_________________
Walt
Top
 Profile  
 
Roscoe Primrose
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 12:03 pm 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1629
Turret boards come in a wide variety of shapes and sizes... They're popular with boutique guitar amp manufacturers, so places that sell parts to those guys are good places to look. I would not recommend doing you own PC boards unless you're fairly sure the crossover isn't going to change in the future, PC board traces don't hold up well to repeated re-soldering...

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.
Top
 Profile  
 
FerdinandII
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 12:27 pm 
Offline

Joined: April 22nd, 2013, 12:58 pm
Posts: 270
I would definitely go point-to-point on a board material of your choice.
Use something you can easily drill through, but will be reasonably non-resonant.
Maybe some 3-4mm Polypropylene sheet?
You can run some of the conductors on the back side, if it helps with the layout.

Image
Top
 Profile  
 
Pelliott321
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 3:03 pm 
Offline
User avatar

Joined: January 15th, 2015, 7:19 am
Posts: 1653
Location: Baltimore MD
What I am asking about is how is the best way to connect two wires together.
Is twisting them together and soldering the best way, like in the above picture, or is there a better way?
Should they be crimped with a copper feral, then solder?
Top
 Profile  
 
Roscoe Primrose
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 3:38 pm 
Offline
Site Admin
User avatar

Joined: February 28th, 2013, 10:38 am
Posts: 1629
Absolutely nothing wrong with twisting & soldering as in Bruce's pic..

Roscoe

_________________
I can explain it to you, but I can’t understand it for you.
Top
 Profile  
 
Pelliott321
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 3:45 pm 
Offline
User avatar

Joined: January 15th, 2015, 7:19 am
Posts: 1653
Location: Baltimore MD
Yes it will conduct a signal.
But when you twist solid copper wire you disturb the crystal structure.
not convinced this is the "best way".
Top
 Profile  
 
SoundMods
 Post subject: Re: Best practices
PostPosted: April 12th, 2022, 4:39 pm 
Offline
User avatar

Joined: July 24th, 2015, 4:17 pm
Posts: 1620
Location: Parkville, Maryland
Pelliott321 wrote:
Yes it will conduct a signal.
But when you twist solid copper wire you disturb the crystal structure.
not convinced this is the "best way".

From my point of view I don't like any of my work to look amateurish. I don't think you do either.

If you are going to twist the wire like that for soldering than at least use a Western Union splice and then cover it with shrink tubing.

As far as disturbing the crystal structure is concerned -- that's not even an issue. ???


Attachments:
330px-Western_Union_splice.jpg
330px-Western_Union_splice.jpg [ 24.57 KiB | Viewed 2928 times ]

_________________
Walt
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 1 of 2
  [ 15 posts ]  Go to page 1, 2  Next

Board index » DCAudioDIY Main » Project Discussions

All times are UTC - 5 hours [ DST ]

Who is online

Users browsing this forum: No registered users and 16 guests

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Switch to mobile style
cron
Powered by phpBB® Forum Software © phpBB Group