The Boominator - another stab at the ultimate party machine

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H

hormilo

Member
Joined 2014
Hi guys,
sorry for interrupt the thread, but I need the info about batteries chargers. What are the best deals now? Looking for a lifepo4 cells + charger or SLA-gel with charger. Need 24v since I am runing a tk2050.
I have used the search function but it just gives me the whole thread with 511 pages.

Thanks in advance
 
A

aterren

Member
Joined 2008
Saturnus,

A question regarding the Mini Boominator v2 if I may:

Was the choice to use 6 and 12 mm parts based on building convenience oe driven by acoustic considerations? I am happy to build it as designed but have a joinery idea that would be easier if I used 9mm for the whole exterior (keeping interior dimensions unchanged of course.
 
R

redh0

Member
Joined 2013
C

cremoire

Member
Joined 2013
WesleyK,

Powered up the Maxamp today with the bluetooth and my hifi speakers.
Plenty of power and it's so tiny. It's an impressive product.

I did note that the potometer was a must with the bluetooth reciever as the gain structure meant the lowest volume setting on my phone was loud. (I never tried the low gain setting)

Due to the output difference between the BT module and my phone I was wondering if I could wire a toggle switch to the jumpers to switch between high and low gain.
Does that work?

Cheers
 
W

WesleyK

Member
Joined 2012
I would use a passive attenuator in the signal path between the BT module and the Amp. I will probably have the same problem in my Boominator, as I'm using a switched 3.5mm input socket to be used with a iPhone and raspberrypi + DAC. The signal from the DAC is about twice as strong as the iPhone signal, so I will probably also have to use a passive attentuator to lower the signal of the DAC.

Edit: pretty much the same as what lutkeveld suggests.

A simple toggle switch will work fine to select the gain setting. Use something like hot glue after soldering the wires to the pads, to reduce the stress on the solder pads and prevent them from separating from the PCB.
 
Last edited:
C

cremoire

Member
Joined 2013
Thanks guys.

Having a good look at the Maxamp jumpers makes me a bit nervous about soldering some wires onto it. There is not much room for error and my soldering iron (and skills!) are a bit rubbish.

Tried a 10k pot that I had at home post BT and it didn't do much. (Just to confirm i put the pot between one of the two wires on one channel post BT?)

I have found some mini pots on ebay:

5 Pack - Thumb Adjust Variable Resistors - Potentiometer, Preset, Trimmer, Pot | eBay

They have a 100k option. Nominal power= 0.15W
Would they work?

Otherwise it may be better to wait for someone else to suss out the right resistor first..

Also I have seen Saturnus's wiring diagram for the filters but I managed to confuse myself.
(n/b I have the Accusafe filter set)

So to confirm:

The 6.8uF MKTs go immediately before each individual tweeter on the positive side.

The resistors/chokes go immediately after each PAIR of tweeters on the negative side.

The 470uF Caps go immediately before each PAIR of drivers on the positive side.

And are these polarity dependent? (If so what side is what?)

Thanks and have a good weekend.
 
E

euforia

Member
Joined 2005
euforia said:
Acctually, I have a 10K linear monopot wired to my Maxamp 20, the gain is set on high ("unmodded") and i can´t get it completely muted. I have a 20k and even a 50k on it´s way and will try them asap and hope one of them will let me adjust the volume from 0-100% and not 30-100% like im limited to today.

Of course it has to do with the gainsetting and how powerful the signal source is but in my case with a galaxy S4 and various mp3 players the 10K isn´t enough.
Click to expand...

A little update to you in this matter:
I was wrong and want to tell you the solution. When i checked my wires again it turned out i had mixed up the yellow and black wires and therefore making the volume not fully muting:spin:. Now when i have switched their places it mutes as supposed and the pot. behaves as you expect.
 
W

WesleyK

Member
Joined 2012
cremoire said:
Thanks guys.

Having a good look at the Maxamp jumpers makes me a bit nervous about soldering some wires onto it. There is not much room for error and my soldering iron (and skills!) are a bit rubbish.

Tried a 10k pot that I had at home post BT and it didn't do much. (Just to confirm i put the pot between one of the two wires on one channel post BT?)

I have found some mini pots on ebay:

5 Pack - Thumb Adjust Variable Resistors - Potentiometer, Preset, Trimmer, Pot | eBay

They have a 100k option. Nominal power= 0.15W
Would they work?

Otherwise it may be better to wait for someone else to suss out the right resistor first..

Also I have seen Saturnus's wiring diagram for the filters but I managed to confuse myself.
(n/b I have the Accusafe filter set)

So to confirm:

The 6.8uF MKTs go immediately before each individual tweeter on the positive side.

The resistors/chokes go immediately after each PAIR of tweeters on the negative side.

The 470uF Caps go immediately before each PAIR of drivers on the positive side.

And are these polarity dependent? (If so what side is what?)

Thanks and have a good weekend.
Click to expand...

Would this help?
boominator_mini_cartoon_schematics.png

Not completely finished yet, but it might help :)
 
M

mpaev

Member
Joined 2012
Hi, i've for the past several years used the amp6 basic for my half-boominator. But now the amp is broken and I want to buy a new one. But unfortunately it's out of stock at the moment and I need it for the upcoming Roskilde Festival.

Is there an alternative amp that you can recommend instead.
 
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