Active Crossover Board Group Buy

BobEllis · 18th July 2006, 02:29 PM

Looking for interest in another active filter board group buy.

Each board is a single channel. Two required for stereo 2 way, 4 for stereo 3 way, 6 for stereo 3 way.

Features:

High/Low/bandpass to 4th order.
Sallen Key equal component value topology (jumper for unity gain topology)

Balanced/Single ended input buffer with bandwidth limiting lowpass (optional) can also be configured as shelving low pass filter (baffle step compensation).

Variable attenuation for both high and low pass output buffers.

Independent of the high and low pass filters, the following can be patched into either band:

Linkwitz transform (biquad)

2 notch/peaking EQ sections

first order all pass

The board does not include a +/- 15V power supply. Power supply boards and parts are also available as part of the group buy (if there is enough interest)

Active XO Board Goup Buy WIKI

wigginjs · 18th July 2006, 04:52 PM

Quote:

Two required for stereo 2 way, 4 for stereo 3 way, 6 for stereo 3 way.

Sorry, could you clarify this? I believe this was a typo.

Davey · 18th July 2006, 05:12 PM

6 for stereo 4 way.

Davey.

BobEllis · 18th July 2006, 05:19 PM

Sorry about the typo.

Each board is a single channel configurable as either high + low pass or bandpass. We chose to keep the boards single channel to allow the other features and still keep within the free version of Eagle's size limits.

Schematic: http://www.delta-audio.com/temp_jens...io.com.sch.pdf

A single board does a single channel two way, use two for a stereo two way.

For a three way you need two boards per channel - either 1 for High and Low, the other for Mid (bandpass) or one for mids up/lows and the other mids/tweeters.

Similar concept for a four way, three boards per channel.

F1 FAN · 19th July 2006, 12:46 AM

Hi Bob ,
I would be interested in 4 boards but not sure how to add my name on the list.

Thanx Fred

BobEllis · 19th July 2006, 11:40 AM

Got you covered Fred. Need any power supply boards?

Killjoy99 · 19th July 2006, 08:44 PM

Added myself for 8 boards

F1 FAN · 19th July 2006, 09:47 PM

Hi Bob, sign me up for 1 PS board also.
I was going to use nasty LM 7815,7915's then I took a look at your Reg's.They should be a big improvment.

Thanks again Fred

BobEllis · 19th July 2006, 10:01 PM

No problem Fred.

All you need to do if you have any changes is click the "click here to edit this page" link at the bottom of the page. You may need to sign in again, but it's really pretty easy. There's a "sandbox" page on the Wiki that allows you to practice without risk of harm.

F1 FAN · 20th July 2006, 03:05 AM

I just read through most of the threads on the filter and PSU boards and must say a big thanks goes out to Bob and Jens for the time and effort that went into these excellent circuit and PCB designs.Your efforts put Hi performance active crossovers in our hands for ridiculously little money.

Great work Gentlemen.

Fred

18th July 2006, 02:29 PM	#1
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Active Crossover Board Group Buy Looking for interest in another active filter board group buy. Each board is a single channel. Two required for stereo 2 way, 4 for stereo 3 way, 6 for stereo 3 way. Features: High/Low/bandpass to 4th order. Sallen Key equal component value topology (jumper for unity gain topology) Balanced/Single ended input buffer with bandwidth limiting lowpass (optional) can also be configured as shelving low pass filter (baffle step compensation). Variable attenuation for both high and low pass output buffers. Independent of the high and low pass filters, the following can be patched into either band: Linkwitz transform (biquad) 2 notch/peaking EQ sections first order all pass The board does not include a +/- 15V power supply. Power supply boards and parts are also available as part of the group buy (if there is enough interest) Active XO Board Goup Buy WIKI

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18th July 2006, 05:12 PM	#3
Davey diyAudio Member Join Date: Dec 2001 Location: Bremerton, WA.	6 for stereo 4 way. Davey.

18th July 2006, 05:19 PM	#4
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Sorry about the typo. Each board is a single channel configurable as either high + low pass or bandpass. We chose to keep the boards single channel to allow the other features and still keep within the free version of Eagle's size limits. Schematic: http://www.delta-audio.com/temp_jens...io.com.sch.pdf A single board does a single channel two way, use two for a stereo two way. For a three way you need two boards per channel - either 1 for High and Low, the other for Mid (bandpass) or one for mids up/lows and the other mids/tweeters. Similar concept for a four way, three boards per channel.

19th July 2006, 12:46 AM	#5
F1 FAN diyAudio Member Join Date: Jun 2006	Hi Bob , I would be interested in 4 boards but not sure how to add my name on the list. Thanx Fred

19th July 2006, 11:40 AM	#6
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	Got you covered Fred. Need any power supply boards?

19th July 2006, 08:44 PM	#7
Killjoy99 diyAudio Member Join Date: Dec 2003 Location: Seattle, WA	Added myself for 8 boards

19th July 2006, 09:47 PM	#8
F1 FAN diyAudio Member Join Date: Jun 2006	Hi Bob, sign me up for 1 PS board also. I was going to use nasty LM 7815,7915's then I took a look at your Reg's.They should be a big improvment. Thanks again Fred

19th July 2006, 10:01 PM	#9
BobEllis diyAudio Member Join Date: Sep 2003 Location: Upstate NY	No problem Fred. All you need to do if you have any changes is click the "click here to edit this page" link at the bottom of the page. You may need to sign in again, but it's really pretty easy. There's a "sandbox" page on the Wiki that allows you to practice without risk of harm.

20th July 2006, 03:05 AM	#10
F1 FAN diyAudio Member Join Date: Jun 2006	I just read through most of the threads on the filter and PSU boards and must say a big thanks goes out to Bob and Jens for the time and effort that went into these excellent circuit and PCB designs.Your efforts put Hi performance active crossovers in our hands for ridiculously little money. Great work Gentlemen. Fred

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