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Old 7th October 2014, 06:44 PM   #1
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Default nanoDSP crossover, suggestions please

below a minimal digital crossover design, intended for a 2-way active system. input is balanced, outputs are 2ch balanced or bridge drive or 4ch multiway.
input peak led and vol control. I added the extra no-overshoot low-passfilters. opamp is the TS921, board would be 100x60mm. this is similar to the freeDSP publication http://www.dafx14.fau.de/papers/dafx...budget_ope.pdf
except this one is mono, to be built into the cabinet. code development uses the free sigmadsp tools from AD.

any suggestions for features that keep the design still elegant and simple ?
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File Type: pdf XO_DSP3.sch.pdf (63.3 KB, 88 views)
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Old 11th October 2014, 10:33 AM   #2
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ok this the board...
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File Type: pdf XO_DSPfinal.brd.pdf (184.8 KB, 57 views)
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Old 12th October 2014, 03:57 AM   #3
RNMarsh is offline RNMarsh  United States
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Question.... will you be able to sell them fully loaded with parts and maybe even as a complete turn-key package??

THx-RNMarsh
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Old 12th October 2014, 04:44 AM   #4
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I could, if I can find a decent assembly house. the throughhole parts could be customer specific, like the 2 XLR's, input and loopthrough. I'm considering changing the led in a bicolor one, green signal present, yellow -10dB, red > -3dB.

i could come with a standard xo software schematic with limiters on the speakers and a delay on the high channel. users could add their specific EQ's ..
is that what you have in mind ? a flat board w/o xlr's (ships neatly in an envelope)
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Old 12th October 2014, 06:16 AM   #5
Mooly is online now Mooly  United Kingdom
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Moved to digital line level forum.
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Old 12th October 2014, 02:32 PM   #6
RNMarsh is offline RNMarsh  United States
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Quote:
Originally Posted by basreflex View Post
I could, if I can find a decent assembly house. the throughhole parts could be customer specific, like the 2 XLR's, input and loopthrough. I'm considering changing the led in a bicolor one, green signal present, yellow -10dB, red > -3dB.

i could come with a standard xo software schematic with limiters on the speakers and a delay on the high channel. users could add their specific EQ's ..
is that what you have in mind ? a flat board w/o xlr's (ships neatly in an envelope)
Yes, something like that. I cant do firmware, flashing or write code. Just want a nice, ready too use product.

-RNM
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Old 12th October 2014, 02:38 PM   #7
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Quote:
Originally Posted by RNMarsh View Post
Yes, something like that. I cant do firmware, flashing or write code. Just want a nice, ready too use product.

-RNM
You will have to do some programming of the board... it's just a blank canvas. Even if you need a "paint by numbers" approach, you still have to apply the paint.
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Old 12th October 2014, 02:56 PM   #8
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there are 2 ways to program the board.
1: use the interactive USBi interface for sigma studio (approx $80)
or
2: a standalone i2C eeprom programmer to connect to the i2C bus (around $30)

option 1 gives you the luxury of changing parameters while listening.
option 2 is well suited for batch production..

have a look at this demo/ad .
Analog Devices: SigmaStudio Overview - YouTube

i'm allergic to "C", i'm a hw analog guy (mostly full custom CMOS ultra low power analog), i can write matlab code on signals, wrote some dsp code a long time ago, but only assembly, then I know what is going on.
the purpose of the project is to deliver a HW platform for audio processing, be it XO, delay, compression/limiting, EQ. that's up to the end user. I selected this over the minidsp for these following reasons: cost, monophonic embed into cabinets, capability of peak and rms limiting that minidsp only delivers with the expensive modules. my personal application is PA use.
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Old 12th October 2014, 04:33 PM   #9
Baldin is offline Baldin  Denmark
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Cool project
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Old 12th October 2014, 05:31 PM   #10
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Why use the switcher in the PSU? How is it's noise level compared to LDO or linear regulator?
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