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Old 11th August 2012, 11:17 AM   #111
gmarsh is online now gmarsh  Canada
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Well, decision time.

The current hardware will never be made into a product. The ADAU1592 chips are now officially obsolete, I can't buy them anymore. And the current method of changing DSP filter coefficients, which involves reprogramming the microcontroller, is unreasonable for 99% of people who would ever use the card.

I'll keep on using this card for my own purposes (the original design intent...) and if anyone wants a blank PCB and feels like sourcing parts themselves, I'll mail a card in an envelope for a few bucks.

If there's enough interest, I'll put in the work to make something that's a lot more consumer ready. I'd love to make a full sealed metal box with an IP rated connector or two on the outside (I've found some nice IP-rated D-sub connectors) that you can plug into a PC and set up, tweak live, etc. I'll warn though, it might not be cheap!
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Old 13th August 2012, 11:03 AM   #112
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Quote:
Originally Posted by gmarsh View Post
Well, decision time.

The current hardware will never be made into a product. The ADAU1592 chips are now officially obsolete, I can't buy them anymore. And the current method of changing DSP filter coefficients, which involves reprogramming the microcontroller, is unreasonable for 99% of people who would ever use the card.

I'll keep on using this card for my own purposes (the original design intent...) and if anyone wants a blank PCB and feels like sourcing parts themselves, I'll mail a card in an envelope for a few bucks.

If there's enough interest, I'll put in the work to make something that's a lot more consumer ready. I'd love to make a full sealed metal box with an IP rated connector or two on the outside (I've found some nice IP-rated D-sub connectors) that you can plug into a PC and set up, tweak live, etc. I'll warn though, it might not be cheap!
I'm definitely interested in having a blank PCB and source the parts myself.

After all, this is a DIY audience you are preaching to
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Old 13th August 2012, 08:31 PM   #113
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I will be attempting to create an all analog purpose made Boominator amplifier, with similar features.

A pair of RC4200 chips (harmonic bass extension) just arrived in the mail. But I'm going to dial mine up a bit higher to support "miniature Halfinator" (Pair of Monacor SP-60/4) which is considerably easier to lift and carry although the box is not tiny. Outdoor tuning has it go down to 120hz and then hopefully the bass harmonic enhancer circuit can extend that a bit deeper.

Eventually, I hope to learn how to adapt the clipnipper to react to (track) varying rail voltage from the battery powered amplifier. The clipnipper project is a rough and rowdy "plays louder" sort of limiter much like a volumax. Likewise it sounds better than clipping. Unlike a volumax, the clipnipper aboard the audio amp only engages as needed (and it can simultaneously engage the BlareBuster voice band uncompress/anti-shout filter). Even when engaged in its simplest form, the analog limiter has prettier voice band than the "Yaaa!!!" of a radio station processor. So in this case, I favor analog. If only it would track the rails.

The Tripath amplifiers seem to have a clipping indicator and there's a 1 transistor boost to get it to light up an LED or a 4n25, which is good enough for a soft clipper to clean up ragged bass notes that escape the clipnipper. . . in theory. I'm just not sure how fast those can run or if it is even useful to add the soft clipper in addition to the clipnipper limiter. But, I'm sure its doable.

Sorry to take a different path, but the analog looks so much more. . . ready to use. Plus there's less soldering and it looks like the circuits are easier to control/adjust with simple things like a dial or switch.

Ever considered an analog version with such features?
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Old 22nd August 2012, 01:46 PM   #114
gmarsh is online now gmarsh  Canada
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You could use another pair of RC4200s, multiplying the input signal with a filtered battery voltage sense. Poke them between your limiter and your amplifier.

I've got a couple reasons for taking a digital approach with the original card - (1) ridiculous expandability/adjustability with the DSP (no need to replace components, etc), (2) repeatability (high order filters are tough to adjust), (3) power (DSP can replace dozens of op-amps, multipliers, etc and pull a lot less power in the process) and (4) I spent 8 years writing DSP code for a living, so I'm biased

Anyway, I'm shifting gears on this project. I'll be working on a more customer-friendly Boominator card, or maybe even a few different versions of them with a different set of features. These will be made available for public consumption, I promise
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Old 22nd August 2012, 01:54 PM   #115
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I've been watching this project with great interest, but I'm one of those people for whom a more consumer-friendly approach is needed. I'll be in line to purchase one when it's ready if it has enough flexibility to work with different configurations besides only the Boominator.

Best wishes,

--Buckapound
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Old 23rd August 2012, 05:37 AM   #116
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Quote:
Originally Posted by gmarsh View Post
I'm shifting gears on this project. I'll be working on a more customer-friendly Boominator card, or maybe even a few different versions of them with a different set of features. These will be made available for public consumption, I promise
You're awesome.
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Old 4th September 2012, 01:17 AM   #117
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Originally Posted by gmarsh View Post
Anyway, I'm shifting gears on this project. I'll be working on a more customer-friendly Boominator card, or maybe even a few different versions of them with a different set of features. These will be made available for public consumption, I promise
I've got a basic ADAU1701 circuit with two of the newer SSM3302 chips on them. I've got prototype boards made and a bag of parts but haven't had time to assemble one yet. This will be a stereo 2-way amp board with the ADAU1701 for the crossover.

And I've got some nice software to design crossovers on the PC and download the parameter data for the crossover to the ADAU1701 via USB. The PC software will also read in measurement files (FRD/ZMA) and allow realtime interactive crossover design.

Unfortunately, I'm not interested in making the software open source, but it will be available at a very reasonable price. Maybe there are some collaboration opportunities with the Boominator design project that we should explore, or at least drive these projects on a parallel path...

I feel your pain about the ADAU1592 chips going NLA, but I'm still reeling from the previous generation AD1990-series getting discontinued. I made a pretty cool board with the AD1994 several years ago and this new board is an update to that design.

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Old 4th September 2012, 07:19 AM   #118
marce is online now marce  United Kingdom
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Layout looks scrappy, could do with fettling.
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Old 19th February 2013, 12:24 AM   #119
RZRARMY is offline RZRARMY  United States
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So what happened with this project?
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Old 13th March 2013, 04:48 PM   #120
gmarsh is online now gmarsh  Canada
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A few things happened:

- The card isn't user friendly at all. To make changes to the DSP processing, you need to buy an expensive DSP debugger, AVR programming pod and do a lot of work.
- The ADAU1592 class D amp chips used on the card are obsolete.
- I'm using this card myself (I originally designed it for myself), I'm content with it and I don't really have any motivation/reason to design another one.
- I worked on a few other design concepts for a while, including looking into bulk manufacturing of an "official" Boominator card. Unfortunately I couldn't bring the price point down to a low enough point where anyone would want to buy it. These cards would be made by the dozens, not the thousands, which means paying for domestic manufacturing - which is much higher than the chinese manufacturing costs everyone's used to.

I've posted the hardware design files on page 11 under a CC BY-NC-SA license, and I'll locate the software files sometime and release them. So anyone's free to take the design, modify it, and run with it.
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