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Old 18th July 2006, 03:29 PM   #1
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Location: Upstate NY
Default 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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Old 18th July 2006, 05:52 PM   #2
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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.
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Old 18th July 2006, 06:12 PM   #3
Davey is offline Davey  United States
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6 for stereo 4 way.

Davey.
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Old 18th July 2006, 06:19 PM   #4
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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.
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Old 19th July 2006, 01:46 AM   #5
F1 FAN is offline F1 FAN  Canada
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Hi Bob ,
I would be interested in 4 boards but not sure how to add my name on the list.

Thanx Fred
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Old 19th July 2006, 12:40 PM   #6
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Got you covered Fred. Need any power supply boards?
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Old 19th July 2006, 09:44 PM   #7
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Added myself for 8 boards
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Old 19th July 2006, 10:47 PM   #8
F1 FAN is offline F1 FAN  Canada
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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
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Old 19th July 2006, 11:01 PM   #9
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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.
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Old 20th July 2006, 04:05 AM   #10
F1 FAN is offline F1 FAN  Canada
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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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