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Class D Switching Power Amplifiers and Power D/A conversion

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Old 8th June 2012, 02:57 PM   #2901
Hafde is offline Hafde  Denmark
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Quote:
Originally Posted by Saturnus View Post
There is room for both you know. There aren't many handles that are more than about 95mm in height. And since there's 135mm from the port to the top there should be plenty of room for both without having to move the port.
very well then, i think i might just add a simple leather strap as handle, with a discrete paint job. and i think that would do it, well see as the build progresses
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Old 8th June 2012, 04:30 PM   #2902
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Soooo, we're having a meet up at Roskilde this year as we did last year.

Its going to be at Roskilde Open's camp @ Area L, tuesday the 3rd at 15:00!

Boominator Meet Up @ Roskilde Festival | Facebook
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Old 9th June 2012, 06:39 PM   #2903
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I've been wondering, what cooling requirements are there exactly for the AMP9?

I've seen people just connecting it directly to the aluminum casing but is that really enough at 24V?
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Old 10th June 2012, 10:25 AM   #2904
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I tried measuring my boominator today with an app on my phone. It played around 95 db at full volume. That's not nearly enough is it?

The only thing I can see as the problem is the amp but I don't know what's wrong.
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Old 10th June 2012, 10:36 AM   #2905
wurtel is offline wurtel  Belgium
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Quote:
Originally Posted by Rolschau View Post
I tried measuring my boominator today with an app on my phone. It played around 95 db at full volume. That's not nearly enough is it?

The only thing I can see as the problem is the amp but I don't know what's wrong.
I'm thinking the mic on a smartphone isn't the most accurate measuring device?
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Old 10th June 2012, 11:11 AM   #2906
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Quote:
Originally Posted by Rolschau View Post
I tried measuring my boominator today with an app on my phone. It played around 95 db at full volume. That's not nearly enough is it? The only thing I can see as the problem is the amp but I don't know what's wrong.
Option one: You didn't solder different gain resistors on the amp board? No wonder you're having trouble. iPhone is nowhere close to as strong as an 80's CD player that all amplifiers are set for. Internal gain setting is not the same thing as the volume knob. The volume knob won't help until after you solder 2 resistors in the amp board (to crank up the internal gain).

Option two: If you don't want to solder on your amp board (#1 most frequent mod for the T-amp platform) then you could give her a shove with a preamp. Again, you can make a little Cmoy battery powered preamp very easily. Wouldn't it be great if there was a preamp that helps reading?

Option three: Dramatically increase the speaker efficiency.
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Old 10th June 2012, 11:24 AM   #2907
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Quote:
Originally Posted by danielwritesbac View Post
Option three: Dramatically increase the speaker efficiency.
It's a Boominator. The efficinecy is already 101-102dB/w/m
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Old 10th June 2012, 11:27 AM   #2908
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Quote:
Originally Posted by Rolschau View Post
The only thing I can see as the problem is the amp but I don't know what's wrong.
Have you tried different cables. And are you sure the signal cables is fully inserted into both the amp and the iphone. Iphones have notoriously bad output connectors.
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Old 10th June 2012, 01:37 PM   #2909
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Default TK2050 Amps

I've been thinking about replacing our amp6b(To get more power) with an amplifier with a TK2050 chip. I've been looking at hifimediy.com's amps and according to the information I've been able to find, they should be of better quality than the popular Sure TK2050 amps. The fact that the SURE amps isn't passively cooled scares me away from putting them in a littled confined room as in the Boominator.

So I'm thinking about replacing it with an T1-M (Hifimediy T1-M TK2050 9 - 24V), since this can run anything from 9V-24V, so I will be able to switch between 12V and 24V all depending on the amount of power i need.

I would like to able to run this from a 12V battery and therefore need a step-up converter to supply the amp with 24V and these have been recommended to me: DC 12V to 24V 8A 200W Step-up DC-DC Convertor Module | eBay).

That leaves me with three questions:
1. Does anyone have experience with the amps from hifimediy.com? How's the quality?
2. Will the step-up transformer deliver a constant voltage at 24V? There's a note on hifimediy.com that states the following: "note: 24V is max, it is not recommended to run on 24V, except if you are sure the voltage is constant and will not go above )24V".
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Old 10th June 2012, 01:43 PM   #2910
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Default Box volume and accousitical qualities...

Hey everybody!

Great thread! I love the design, espeacially the magnet to magnet mounting of the drivers, so I want to build one myself with the recommended components. However, I have a question regarding the size of the box and its accoustical qualitites:

Since I want to fit my Boominator on a bike trailer, I cant make it 1m long as reccomendend in the original boominator design (sketchup file).
I also do not need a battery compartment, since I will use an external battery and solar panel (that I also use for other uses, its more practical that way).

So, I have 2 short questions:

- Do I need to seperate the two compartments? (In the original design the battery-box seperates left from right channel)

- Will the accoustical performance stay similar, if I just increase height and keep the volume of the box constant (30l per channel).


I tried to model the box in WinISD, but had some problems. The magnet to magnet mounting is not supported, and I wasnt sure about what tuning frequency to use. If I use a tuning-frequency of 82Hz (I think Saturnus mentioned that somewhere) and a volume of 30l I get a +4dB peak at app. 110Hz... can that be right? Attatched you find a screenshot of the calculations!

Thanks!



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