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Class D Switching Power Amplifiers and Power D/A conversion

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Old 7th June 2012, 06:23 PM   #2881
rubennn is offline rubennn  Denmark
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I'm at building this year's boominator now, trying carefully to get everything right.

Saturnus, the principle drawing of the port you have made in Google Sketchup has the dimensions 48mm x 104mm. If I remember correctly you have to round the port. But with rounding the port, what should I do? I could run over a router on the edge, curving the mouth on the outside and inside. Or are you supposed to arc the 48mm dimension? (I've seen a couple of people do the latter).

Last year I only did the first thing.
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Old 7th June 2012, 06:57 PM   #2882
osny is offline osny  Sweden
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How can i lower the volume on the piezos? Just by adding more resistors?
I don't notice any difference between 33 and 115 ohm.. (metal film resistor)
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Old 7th June 2012, 07:25 PM   #2883
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Quote:
Originally Posted by rubennn View Post
I'm at building this year's boominator now, trying carefully to get everything right.

Saturnus, the principle drawing of the port you have made in Google Sketchup has the dimensions 48mm x 104mm. If I remember correctly you have to round the port. But with rounding the port, what should I do? I could run over a router on the edge, curving the mouth on the outside and inside. Or are you supposed to arc the 48mm dimension? (I've seen a couple of people do the latter).

Last year I only did the first thing.
It's 30x120mm rounded in the ends. 36mm deep.
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Old 7th June 2012, 07:41 PM   #2884
rubennn is offline rubennn  Denmark
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Thanks man!

Will note that for future boominators.
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Old 7th June 2012, 07:45 PM   #2885
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Originally Posted by Saturnus View Post
I can't see if there's anything wrong.

And the amp is turned all the way up? Basically it has to be at maximum at all time. And you control volume with the source.
Yeah, at maximum. Maybe it's just my sense of loud that's skewed a bit - My girlfriend and parents thought it was loud. Or maybe the input from my phone is to the low side. Anyways, the sound is great and it's loud enough for most occasions.
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Old 7th June 2012, 07:49 PM   #2886
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Originally Posted by osny View Post
How can i lower the volume on the piezos? Just by adding more resistors?
I don't notice any difference between 33 and 115 ohm.. (metal film resistor)
Resistor do not dampen piezos. Capacitors do. As the piezo is 130nF, add a 0.13uF cap in series to dampen by 6dB. That's probably too much though.

Note that this cap should be in parallel with the series resistor, not in series with it.

Rough dampening values to test:

-1dB = 22nF
-1.5dB = 33nF
-3dB = 67nF

Last edited by Saturnus; 7th June 2012 at 07:55 PM.
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Old 7th June 2012, 07:50 PM   #2887
rubennn is offline rubennn  Denmark
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Originally Posted by Rolschau View Post
Yeah, at maximum. Maybe it's just my sense of loud that's skewed a bit - My girlfriend and parents thought it was loud. Or maybe the input from my phone is to the low side. Anyways, the sound is great and it's loud enough for most occasions.
Actually I've found that iPhones and iPod Touch products give the loudest output. More than a lot of other phones and more than the iPod Nano or the iPod shuffle.

At least that's my experience.
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Old 7th June 2012, 08:05 PM   #2888
ohman92 is offline ohman92  Sweden
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Hi Saturnus! Awesome boombox!

I dont have cash to build a boominator. And I dont need mine to be that big, so I wonder if you could make a sketchup for an box with 2 HP-10T and 2 QLM-1005. I want them to be on the same side, because I'll use my box when we play beachvolley. I want the sound to be directed in one direction.

If you have time for this it would be awesome! thanks
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Old 7th June 2012, 09:23 PM   #2889
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Originally Posted by ohman92 View Post
Hi Saturnus! Awesome boombox!

I dont have cash to build a boominator. And I dont need mine to be that big, so I wonder if you could make a sketchup for an box with 2 HP-10T and 2 QLM-1005. I want them to be on the same side, because I'll use my box when we play beachvolley. I want the sound to be directed in one direction.
Thanks.

I could but I won't. The Boominator is based on exploring the bipolar speaker principle for use in free field environments. It makes no sense to make one with speakers on just one side as that would require a complete redesign. And it would destroy the very basic principle on which the Boominator is built.

I also sincerely think that for your use, a bipolar speaker (speakers on both sides) would be far better suited.

Should you decide to make your own speaker, I will strongly recommend not using the HP10T as it is not designed for compact enclosures, and the QLM-1005 isn't one of the best Motorola/CTS copies out there either.

Last edited by Saturnus; 7th June 2012 at 09:26 PM.
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Old 8th June 2012, 08:55 AM   #2890
Hafde is offline Hafde  Denmark
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so, i would like to use the solar cells from this site.

Solar Cell Huge - 5.2W - Solar - Components - All you need to prototype

but as they are mono-crystalline, would i get a noticeable difference in battery life? or should i just skip the idea?
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