The Boominator - another stab at the ultimate party machine

[aaroe]

Originally Posted by Phaedras

You might wanna check out this build.. He made a giant VU meter..

The “Malen” Boombox « Popdevelop – A developer team from Malmö, Sweden

Yeah, I've seen that, but its seems way too complicated compared to my electronics skills :-) - but I've found a suitable solution that I think will be great - pictures will be posted ofcourse :-)

[aaroe]

Originally Posted by skipper87

Each 2 LEDs are connected to 12 V, so you will just have to put some more LEDs in series and use a smaller resistor. Make sure that that the forward voltage drops doesn't exceed the supply. If you want more LEDs, then just put them in parallel on each branch with the transistor.

Ahh, of course, I see that now :-) Thanks for opening my eyes ;-)

[mathieu93]

Hi everyone, I'm new here. I'm also on the Dutch 'boominator' topic, called 'kistradio' topic. I'm building a boominator and I'm stuck with a few questions. But first, some pictures of the idea of my boominator. Disign picture 1, design picture 2, schematic. The schematic is in Dutch, so I don't think you'll understand most of it.. In my box, there's going to be one subwoofer (Visaton W170S) and two car-speakers (Blaupunkt GTx-542). It's all powered by a 12V battery and it can switch to power supply (12V). I'm also going to add two LED VU meters. Later on, I maybe add a Raspberry Pi to my speaker.

I've got one question about the speaker. I want to add a simple bass/treble controllers based on a NE5532 opamp. There are lots of schematics on the internet about bass/treble controllers, but since I've got only a 12V power supply, it's not simple to build a controller. I have already found a schematic which makes a symmetric power supply out of my battery, but the problem with this is that is can only give +/- 6V DC.

Now I've found this schematic. The datasheet of the NE5532 says that the NE5532 works from 5 till ... V. Will this schematic work on a +/- 6V power supply? Since the opamps are parallel to the power supply, I think the opamps will get 6V, am I right?

If you have any questions left, just ask them!

[Phaedras]

Originally Posted by mathieu93

Hi everyone, I'm new here. I'm also on the Dutch 'boominator' topic, called 'kistradio' topic. I'm building a boominator and I'm stuck with a few questions. But first, some pictures of the idea of my boominator. Disign picture 1, design picture 2, schematic. The schematic is in Dutch, so I don't think you'll understand most of it.. In my box, there's going to be one subwoofer (Visaton W170S) and two car-speakers (Blaupunkt GTx-542). It's all powered by a 12V battery and it can switch to power supply (12V). I'm also going to add two LED VU meters. Later on, I maybe add a Raspberry Pi to my speaker.

I've got one question about the speaker. I want to add a simple bass/treble controllers based on a NE5532 opamp. There are lots of schematics on the internet about bass/treble controllers, but since I've got only a 12V power supply, it's not simple to build a controller. I have already found a schematic which makes a symmetric power supply out of my battery, but the problem with this is that is can only give +/- 6V DC.

Now I've found this schematic. The datasheet of the NE5532 says that the NE5532 works from 5 till ... V. Will this schematic work on a +/- 6V power supply? Since the opamps are parallel to the power supply, I think the opamps will get 6V, am I right?

If you have any questions left, just ask them!

Your design has nothing to do in this thread, as its not even remotely similar to a boominator.. You should start your own thread or post somewhere else

[Excile]

Originally Posted by Saturnus

...
From 1st cut
2x 900x300mm (side baffles)
2x 900x276mm (top/bottom)
...

Why 2x900x276mm? They fit between the sides, so shouldn't it be 900 - 2x12 = 876mm?

[mathieu93]

Originally Posted by Phaedras

Your design has nothing to do in this thread, as its not even remotely similar to a boominator.. You should start your own thread or post somewhere else

Why not? Its a case of 30 x 30 x 50 cm. I'm going to put wheels on it so I can take it with me to the beach. I don't understand why this is different from a boominator? It's only an advanced boominator.

[Campino Morten]

Originally Posted by Saturnus

From 1st cut
2x 900x300mm (side baffles)
2x 900x276mm (top/bottom)

From 2nd cut
4x 276x276mm (ends/centers)
1x 276x66mm (top spacer)

From 3rd cut
2x 276x393mm (center braces)
4x 276x92mm (port/handle pcs)

The ends are "inside" the top/bottom and the side baffles. As you can see from 2nd cut, the ends and centers are same size and are 300-2*12=276mm.
This also gives a stronger construction, since the outside pressure on the box is often higher on the top/bottom then on the end pieces.

[Excile]

Originally Posted by Campino Morten

The ends are "inside" the top/bottom and the side baffles. As you can see from 2nd cut, the ends and centers are same size and are 300-2*12=276mm.
This also gives a stronger construction, since the outside pressure on the box is often higher on the top/bottom then on the end pieces.

Ah, perfect. I compared alot with the sketch up drawing, where the ends are "outside" the top/bottom. That's the reason i got a little confused.

[Saturnus]

Originally Posted by mathieu93

Why not? Its a case of 30 x 30 x 50 cm. I'm going to put wheels on it so I can take it with me to the beach. I don't understand why this is different from a boominator? It's only an advanced boominator.

Hi. It's because it's not in line with the general design principle of the Boominator (or Halfnitor) which are based on a bipolar "monocoque" cabinet with professional drivers and highly efficient amplifiers to form a relatively cheap design while preserving very high sound quality levels (think very good home stereao or better sound quality) in a (semi-)portable design with extremely long battery life time (in some designs basically forever).

[juhomoil]

Hi, I am a Boominator fan from Finland and I'm planning to build a kind of Boominator to be transported with bicycle trailer. My trailer is only 62 cm long so it would be necessary to shorten the Boominator box. I would also like to have some shape in it. But I don't want to mess up with good design so can you evaluate that how much my changes would affect to sound quality compared to basic Boominator design.

Picture of the trailer-idea and shape of the Boominator box:


And picture of SketchUp-drawing of the box(only half of it):

The volume of both chambers are same as in original design (aprox. 23 litres with everything). And elements will be attached to each other. I already have 4 pieces of HP-10w and 4x RILA SA38-piezos from Ljudia and AMP6-b.

I just would like to hear your, especially Saturnus', opinion about my project. Is there any sense, or should I stay at original design and leave example the middle box out of it to make it shorter that way?