The Boominator - another stab at the ultimate party machine - Page 203 - diyAudio
Go Back   Home > Forums > Amplifiers > Class D

Class D Switching Power Amplifiers and Power D/A conversion

Please consider donating to help us continue to serve you.

Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving
Reply
 
Thread Tools Search this Thread
Old 8th July 2011, 11:20 AM   #2021
rubennn is offline rubennn  Denmark
diyAudio Member
 
Join Date: Jun 2010
Location: Copenhagen
Metalfilm 2W is correct! Just start as low as 10 Ohm and go up. The original Motorola KSN-1005 have been tested with 33 ohm as optimum. The chances are that you might not need any resistor at all...
__________________
Wohoo...Boominator 2012
  Reply With Quote
Old 8th July 2011, 11:24 AM   #2022
donnib is offline donnib  Denmark
diyAudio Member
 
Join Date: Jun 2011
Location: Copenhagen
Quote:
Originally Posted by rubennn View Post
Metalfilm 2W is correct! Just start as low as 10 Ohm and go up. The original Motorola KSN-1005 have been tested with 33 ohm as optimum. The chances are that you might not need any resistor at all...
Oki doki, thx
  Reply With Quote
Old 11th July 2011, 09:43 AM   #2023
diyAudio Member
 
Campino Morten's Avatar
 
Join Date: Jul 2011
Hi everybody.

I'm going to build a boominator, but with some major changes. These are only in the design of wooden box, so the amp and drivers are the same.
Getting an amp6b is easy enough, and the 4*HP10W doesn't seem like a problem either.
The problem is the Piezo PA DJ NTX3711 tweeters. They can't be bought at ebay "This listing was ended by the seller because the item is no longer available." And i haven't been able to locate them anywhere else.
Since these are often sold many at a time, I was hoping that someone might had 4 pcs. lying around for sale?

Why does it have to be these?
Because these are the only one that Saturnus will recommend for my build. And who dares to defy him...?

My build just has to be finished before RF'12, where it will complement the original boominator in our camp. I'm not in a hurry, but getting it done as soon as possible, and hopefully this year would be nice.

I hope that someone can help me one way or another.
  Reply With Quote
Old 11th July 2011, 11:35 AM   #2024
diyAudio Member
 
Join Date: May 2011
We built a half-boominator for Roskilde, and used a 95Ah battery instead of 7Ah with solar cells (so we didn't have any recharging-technology added).

It played all days during the festival with a maximum of 10 hours pause in total - so i can only give the amplifier thumbs up!
  Reply With Quote
Old 11th July 2011, 01:06 PM   #2025
rubennn is offline rubennn  Denmark
diyAudio Member
 
Join Date: Jun 2010
Location: Copenhagen
Quote:
Originally Posted by Sive View Post
We built a half-boominator for Roskilde, and used a 95Ah battery instead of 7Ah with solar cells (so we didn't have any recharging-technology added).

It played all days during the festival with a maximum of 10 hours pause in total - so i can only give the amplifier thumbs up!
Of course you were able to run with it all week You could actually have music for a couple of weeks, if not a month, with that battery and the same use (if not using lights/charging etc.). Remember that half a boominator only uses the half amount of power i.e. ~2-3 W (at max volume.)
__________________
Wohoo...Boominator 2012

Last edited by rubennn; 11th July 2011 at 01:16 PM.
  Reply With Quote
Old 11th July 2011, 01:13 PM   #2026
Smolder is offline Smolder  Denmark
diyAudio Member
 
Join Date: May 2011
Location: VanlÝse
Angry Plus-elektronik.de Crap service

Quote:
Originally Posted by donnib View Post
I personally would not recommend Plus-elektronik.de. I ordered June 16 and still not received them. They claim the shipment disappeared and now waiting for new shipment but the information from the shop is very poor.

I'm also waiting for speakers from Plus-elektronik.de Crap service
  Reply With Quote
Old 11th July 2011, 02:40 PM   #2027
diyAudio Member
 
Join Date: May 2011
Quote:
Originally Posted by KURT1 View Post
What kind of piezos are you using and what kind of resistors?
The Piezo's we are using are these

MPT-005

With 33 ohm, 1/4 Watt resistors on each Piezo.

But as i mentioned earlier, they start "screaming"/"scratching" when we reach the higher level of volume.

With you recommend simple trying with more resistens like 50 ohm, or does the Watt also play a part?

We would like to avoid replacing the Piezo's if this is possible.

In advance, thx for your help.
  Reply With Quote
Old 11th July 2011, 02:40 PM   #2028
donnib is offline donnib  Denmark
diyAudio Member
 
Join Date: Jun 2011
Location: Copenhagen
Quote:
Originally Posted by Smolder View Post
I'm also waiting for speakers from Plus-elektronik.de Crap service
Yup and they got my money and i can't do anything at all. I sent an email to him Friday complaining and still did not get anything from him. Tried calling him today and now he says his mobile is not working to call tomorrow. If i don't hear from him i need to request for a refund and if that does not happen i have to make an official complain but where ? hmmmmm.....
  Reply With Quote
Old 11th July 2011, 02:50 PM   #2029
rubennn is offline rubennn  Denmark
diyAudio Member
 
Join Date: Jun 2010
Location: Copenhagen
Quote:
Originally Posted by Arbitrage View Post
But as i mentioned earlier, they start "screaming"/"scratching" when we reach the higher level of volume.

In advance, thx for your help.
Hmm... Sounds weird. But is it destroying the sound or is it just a little bit? Because piezos tend to sound crappy when compared to normal dome tweeters.

Also, piezos are exclusively run by voltage and most of the piezos from Monacor (at least what I've seen) have a maximum of ~30 V.
__________________
Wohoo...Boominator 2012
  Reply With Quote
Old 11th July 2011, 02:55 PM   #2030
diyAudio Member
 
Join Date: May 2011
Quote:
Originally Posted by rubennn View Post
Hmm... Sounds weird. But is it destroying the sound or is it just a little bit? Because piezos tend to sound crappy when compared to normal dome tweeters.

Also, piezos are exclusively run by voltage and most of the piezos from Monacor (at least what I've seen) have a maximum of ~30 V.
it's "destroying" the sound so much, that you tend to avoid turning the music up so loud, cause it simple get's distorted, and it doesn't seem to be just one of them, but all four.

But do you recommend other resistors or are they broken somehow?
  Reply With Quote

Reply


Hide this!Advertise here!
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



New To Site? Need Help?

All times are GMT. The time now is 02:52 AM.


vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Copyright ©1999-2014 diyAudio

Content Relevant URLs by vBSEO 3.3.2