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Analog Line Level Preamplifiers , Passive Pre-amps, Crossovers, etc.

MOX - active crossover
MOX - active crossover
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Old 20th March 2005, 06:34 PM   #231
akunec is offline akunec  Canada
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I tried to order two mox boards from www.anidian.com a couple weeks ago and I haven't received an email confirmation or anything yet. I have sent several emails and haven't received a response. Is there any other way to get ahold of them?
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Old 1st March 2010, 08:14 PM   #232
Cuda is offline Cuda  France
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HELLO

Where can I found the Dual discrete opamp PCB for DIP8 ?

or juste PDF layout

thanks
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Old 14th April 2011, 10:14 PM   #233
NYCOne is offline NYCOne  United States
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Quote:
Originally Posted by Peter Daniel View Post
Looking at the schematic, I see you have 10K volume pots for ea. section of the crossover.

It seems like a perfect setup to use APOX SHM controller here, as one could set permanently offset levels and then adjust all 4 channels simultaneously. By increasing the gain of op amp, one might combine preamp function with high quality active crossover.

From the schematics I've seen so far, this one seems to be the most appealing (especially when it's based on XVR1)
Peter, did you ever try this? I've been trying to understand it, AXOs are new to me. Does the block diagram mean that one builds the HPF and LPF MOX describes (each having opamps) and also opamps for the larger XO? Essentially, what goes in the HPF and LPF blocks of this diagram?
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Old 15th April 2011, 11:06 AM   #234
AndrewT is offline AndrewT  Scotland
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There are about 3 or 4 clones of this MOX original.
Some were designed specifically to suit experimentation.
Others were more for a final compact XO.
There are at least 2 PDFs giving full construction and use details. These show the multiplicity of different EQs that can be applied to correct for driver anomalies.
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Old 11th June 2011, 07:44 PM   #235
NYCOne is offline NYCOne  United States
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I'm pretty much done with my MOX boards. I need to know what value folks used for the C200 and C500 position in the original group buy boards. I've been over the version two and version four info, and can't see a clear answer.
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Old 11th September 2014, 09:21 PM   #236
harrytam is offline harrytam  United States
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Is there still any way to get some of those board?

Harry
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Old 30th December 2014, 08:26 PM   #237
vdi_nenna is offline vdi_nenna  United States
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I have a question about the functionality of this type of active crossover.
This question has been haunting me for some time now and I'm pretty sure I asked it somewhere else, but searches don't turn up.

In the FRQ selection sections of the crossover, do these two sections sum when used as a 12db crossover?

In the attached, circled are 25 (x100) in FRQ1 and 25 (x100) in FRQ2.

Do the sections combine to equal 5000Hz? Or, does the settings indicate a 12db, 2500Hz slope?

Thanks,

Vince
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Old 1st January 2015, 09:46 AM   #238
AndrewT is offline AndrewT  Scotland
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I am not sure what the selections actually select.

As I understand what an active crossover does:
It is two filters. One is High Pass to feed the higher frequency speaker driver via the power amplifier. The other is a Low Pass to feed the lower frequency speaker driver via it's different power amplifier.

A simple version would be a passive single pole RC for the bass/mid and another single pole CR for the treble.
That creates a single pole (6dB/oct) active crossover.

You can use as many poles for steeper slopes as you choose.

eg.
choose a 2pole Butterworth 2.5kHz High Pass and feed that into a second 2pole Butterworth 2.5kHz High Pass. The result is a 4pole 2.5kHz High Pass. But the Q of each HPF multiply to give a net Q of 0.5 (0.7072*0.7072 = 0.5). That is what a 4pole Linkwitz Riley is and called up as LR4
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Old 3rd March 2017, 06:44 PM   #239
Carl_Huff is online now Carl_Huff  United States
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Just as FYI for anyone that might care.

I've driven the FET gain blocks featured in this project into a modular DOA (Discrete Operational Amplifier)

http://www.diyaudio.com/forums/analo...20-format.html and here ... https://kadproducts.com/
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Old 3rd March 2017, 07:10 PM   #240
vdi_nenna is offline vdi_nenna  United States
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Carl_Huff,

What happens when you need a dual op-amp?

The op-amps designed for the MOX-II XO were dual op-amps.
Are they stackable somehow? Doesn't look like it.

What about the foot print? Do they drop into DIP-8 sockets?
Shot of the underside would be nice.

Here's my mess...

http://www.diyaudio.com/forums/galle...y.php?cat=1764

Vince
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Last edited by vdi_nenna; 3rd March 2017 at 07:12 PM. Reason: Add link
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