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Old 13th December 2007, 06:05 PM   #1
peter_m is offline peter_m  Canada
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Default DIY active x-over for 2.1 application

Hi everyone,

I am looking for an active crossover, like the ones you find in the average HT amp. With a variable frequency from 40 to 200hz. I need it to have both high-pass and low-pass outputs. This way I can re-use existing amps I have lying around for a 2.1 project.

Any chance of you guys seeing an inexpensive DIY design floating out there?

Peter
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Old 13th December 2007, 06:30 PM   #2
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You could pick and choose from Linkwitz. Everything is there, just add psu.
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Old 14th December 2007, 12:46 AM   #3
Daveis is offline Daveis  United States
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It doesn't appear that you can order PCB's from Linkwitz anymore.

The link for ordering instructions is dead.

There's an active crossover group buy. It's over now, but may start up again.

Active filter board GB

Marchand Electronics has some boards for 24db crossovers.
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Old 14th December 2007, 01:01 AM   #4
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Rod Elliot has PCB to sell.


http://sound.westhost.com
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Old 14th December 2007, 01:17 AM   #5
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Quote:
Originally posted by Daveis
It doesn't appear that you can order PCB's from Linkwitz anymore.

The link for ordering instructions is dead.

There's an active crossover group buy. It's over now, but may start up again.

Active filter board GB

Marchand Electronics has some boards for 24db crossovers.

I wasn't thinking PCB's, just schematics. Linkwitz's PCB's would be overkill for what peter_m is proposing.
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Old 14th December 2007, 01:30 AM   #6
Davey is offline Davey  United States
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I'm sure Siegfried still has all of his PCB boards available.

Here's a better link:

http://www.linkwitzlab.com/pcb.htm#MT1

Dave.
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Old 14th December 2007, 02:09 AM   #7
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This isn't diy but is pretty good value.
creative sound reckhorn B-1 $88 shipped
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Old 14th December 2007, 02:57 AM   #8
ttan98 is offline ttan98  Australia
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easier get second-hand Behringer, Marchand, etc, at a cheap price.

I bought my Behringer 3-way x-over, 2nd hand at Ebay for AUD$80. you can convert to 3-way active x-over at later stage or sell it later if you want and you won't lose much money.
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Old 14th December 2007, 03:10 AM   #9
peter_m is offline peter_m  Canada
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Quote:
Originally posted by pedroskova
You could pick and choose from Linkwitz. Everything is there, just add psu.
Looks like what I am looking for... Ready made PCB are for cheaters!

Ok, what I want is this: http://www.linkwitzlab.com/filters.htm#3 I got the spreadsheet to calculate the R and C values. Now what about the OP amps? What are the IC modes numbers that I need? It doesn't specify anywhere. In a different forum someone mentioned the "NE5532".

Also does it require a special power supply or anything relatively clean will do?

Peter
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Old 14th December 2007, 03:14 AM   #10
Daveis is offline Daveis  United States
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Quote:
Originally posted by peter_m


Looks like what I am looking for... Ready made PCB are for cheaters!


Aren't there issues with some of the modern fast opamps and board layout?

For instance, you couldn't just wire perf board or bread board could you?
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