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Class D Switching Power Amplifiers and Power D/A conversion

The Boominator - another stab at the ultimate party machine
The Boominator - another stab at the ultimate party machine
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Old 4th May 2018, 03:50 PM   #6661
aterren is offline aterren  United States
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Join Date: Mar 2008
Location: Greenwich, CT
dk4ever2000ou, I would suggest you have a look at the digest below as a kick start.

Quote:
Originally Posted by aterren View Post
Some time ago I started a document that summarized key information in this thread and, while not done to the standard I had planned I do think it would be some value so I am publishing it as-is. Hopefully some people find this useful.

Feel free to suggest changes, corrections, or send me additional content.

Boominaor Digest draft x1.pdf

Last edited by aterren; 4th May 2018 at 03:54 PM. Reason: Fixed hyperlink
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Old 4th May 2018, 05:07 PM   #6662
Izzy321 is offline Izzy321
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Join Date: May 2018
Default Amplifier

Hi! I build a halfinator last year its good, but I think I can upgrade the sound with another amplifier or (pre-amp)? What's the best amplifier for 12v also just 4ohm because it's just an halfinator, still this Maxamp the way to go?
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Old 4th May 2018, 08:26 PM   #6663
TEH725 is offline TEH725  United States
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Join Date: Apr 2012
Drivershttp://www.loudspeakersplus.com/P-Audio-IMF-HP10W-10-Bass-Speaker-p/p-audio-imf-hp10w.htmhttp://www.ebay.com/itm/P-Audio-PHT-407-Horn-loaded-Super-Tweeter-8-ohm-/252216738616Amphttp://www.ebay.com/itm/111654183793?_trksid=p2060353.m1438.l2649&ssPageNa me=STRK%3AMEBIDX%3AITBatteryhttp://www.batteryspace.com/lifepo4-26650-battery-12-8v-3300-mah-42wh-7a-rate---un38-3-passed.aspxCrossoverJantzen Audio 0.30mH 20 AWG Air Core Inductor Crossover CoilDayton Audio DNR-4.0 4 Ohm 10W Precision Audio Grade ResistorDayton Audio PMPC-1.5 1.5uF 250V Precision Audio Capacitorhttp://www.ebay.com/itm/Euro-Terminal-Block-20-Amp-600-Volt-12-Position-Eurostrip-12-22-AWG-/181429216708?hash=item2a3e0625c4Input PanelPenn-Elcom D0941K Blank Dish Black 3-1/2" x 5-1/8"3.5mm Stereo Panel Mount Jack2.1MM X 5.5MM X 11.2MM DC PLUG WITH 6 FT. CORD2.1MM PANEL MOUNT DC JACKCabinetParts Express 10" Waffle Style Black Steel Speaker Grill with Rubber EdgeAcry-Tech DuraTex Black 1 Pint Roller Grade Cabinet Texture Coating Kit with Textured 3" Roller Penn-Elcom C1539 Ribbed Plastic Stacking Cabinet Corner#6 x 1" Coarse Thread Cabinet Screws 100 Pcs. (for tweeters)Other 1/2" or 3/4" screws for mounting 10" driversWirehttp://www.ebay.com/itm/25-feet-20-AWG-Silver-Plated-PTFE-Teflon-R-Wire-White-19-strands-/381684811524?hash=item58de300704http://www.ebay.com/itm/25-feet-20-AWG-Silver-Plated-Kapton-Wire-Red-19-strand-/231419054333?hash=item35e1a688fdWood12MM BirchGlue/CalkTitebond Exterior Wood GlueType 2 Silicone Calk (for mounting/sealing driver)Hot glue gun / glue (for securing internal wiringLiquid Metal (for securing Drivers to internal baffle)Screws


I think I put the wrong link for the tweeter. You want the 407N: https://www.ebay.com/i/192485765061?...d11da5fffe5539




Last edited by TEH725; 4th May 2018 at 08:31 PM.
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Old 12th May 2018, 07:11 PM   #6664
marijnsp is offline marijnsp
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Join Date: Aug 2016
Quote:
Originally Posted by CCU View Post
For those of you who havenīt seen it.
Sure electronics now makes a bluetooth amp with DSP and a simple high/low-pass filter
The only problem is that the DSP programmer cost more than the board. Mayby we should pool together to get one.

Sure Electronics' webstore 2 x 50 Watt Class D Audio Amplifer Board with Audio DSP - JAB3-50
The programmer is also for sale. The programmer can be used with bluetooth and an app or with usb and sigmastudio. It is really easy to use and only 20 USD.
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Old 13th May 2018, 07:32 PM   #6665
marijnsp is offline marijnsp
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Join Date: Aug 2016
So i've decided I would go and build a boominator. But for making some solid construction plans I drawed it in solid works. Only one small question. Are the bass ports supposed to be rounded at both inside and outside?

Also do you guys think the electrical housing is big enough as in the original drawing? (it now measures 6.6 cm wide)

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Old 17th May 2018, 10:56 PM   #6666
Hofmann is offline Hofmann
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Join Date: Apr 2018
After reading through most of this thread I have started on constructing my own half boominator.
Thanks to Saturnus for developing and sharing all the information!

I use 12mm MDF instead of plywood for budget reasons and because my cheap router handles it better.
I use HP10W speakers and piezo tweeters with an 3W 47 ohm resistor. It will be glued together with epoxy.
To make the wood more moist resistant I have coated the inside with a thin layer of epoxy.
I will be experimenting with TA02024, TDA8932 and TPA3118d amplifiers.
For power I have a 12V 7Ah lead acid battery, which I may be boosting up to 24V with a boost converter when using the TPA3118 and when battery life is not essential.
I also have a chinese 20W solar panel on the way and a constant current constant voltage module for charging.
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Old 18th May 2018, 08:34 AM   #6667
Hofmann is offline Hofmann
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Old 20th May 2018, 12:04 AM   #6668
Think is offline Think  Netherlands
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Join Date: Nov 2017
Location: Den Haag/The Hague, Holland, The Netherlands
The Boominator - another stab at the ultimate party machine
Mdf is a lot heavier and not very water resistant. Okoume ply (and others) is only 5/7 of the weight of birch and probably half the weight of mdf.

With a simple DPDT switch you can switch from parallel to serial connection and back with batteries or speakers or both. My tpa3116 and probably all boards are a lot more energy efficient with 8ohm speakers and 12v or less. (look at the spec sheets)

Why not make the box in 3 parts: a middle part with amp switches and batteries and 2 detachable fullrange speakers on the side with a locking mechanism? That would make it a lot more versatile and easier to pack or carry.
__________________
* It's better to have a system which sounds good and measures bad, then one which measures good and sounds average.*

Last edited by Think; 20th May 2018 at 12:17 AM.
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Old 29th May 2018, 06:37 PM   #6669
aramid42 is offline aramid42
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Join Date: Oct 2017
I want to build a Micro or Half-Mini Boominator. I've got the Sketchup drawings, I've got the circuit diagrams, and this isn't the first speaker I've built so I probably have a pretty good handle on things. However, after spending six hours reading this thread, I'm still a bit confused.


As I understand it, the Boominator is a bipolar design for very good and important reasons, and it's therefore absolutely vital that the left and right channels go to the separate chambers, with both woofers in a given chamber running on the same channel. Based on that, I had assumed that a Halfinator needed to be summed to mono, because trying to make half the original design work in stereo, with only a single enclosure, was bad.


Why, then, does the Mini use 8-ohm woofers, but the Micro use 4-ohm woofers? Wouldn't it make the most sense to build the Micro as precisely half a mini and feed it a mono signal?


Thanks!
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Old 30th May 2018, 10:45 PM   #6670
Hofmann is offline Hofmann
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Join Date: Apr 2018
2 x 8 ohm woofers in parralel equals 4 ohm. I believe the micro is not a bipolar speaker(the drivers only face one way), so it uses 4 ohm drivers. But I am not sure on that.
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