The Boominator - another stab at the ultimate party machine - Page 336 - 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 26th November 2012, 05:39 PM   #3351
axebay is offline axebay  Sweden
diyAudio Member
 
Join Date: Jun 2012
Quote:
Originally Posted by Saturnus View Post
You can make the middle compartment bigger, no problem. I think your major problem will be having enough power.

Peltier element are seriously ineffective. If I recall correctly the most effective peltiers have around 10% efficiency if ambient temperature is optimal and cooling is optimal. Let's just assume it's not, and go with 5% efficiency.

A cup of water of 100ml takes around 420Ws to heat or cool one degree. Let's just round that up to 1.2Wh per degree.

If ambient temperature is 25 degrees, then you need to cool it 20 degrees, and remember that 5% effieciency, that's times 20 again.

So all in all you need around 480Wh or 40Ah to cool one cup of water.

I may have made a mistake here as everything is from memory but at the end of the day, it's a really really bad idea.

But since you're at the beach already, why not water cooling. 15m of tubing, something weigh the end down so you get to the cold water at the bottom, and a water pump. That's about it, really.
Ouch, knew they weren't super efficient but that's really bad. A compressor seams the only way but will be to expensive and heavy...
Perhaps the best way would be a regular ice pack:P But I think I'll discharge this idea..
  Reply With Quote
Old 26th November 2012, 07:41 PM   #3352
ron1 is offline ron1  Ireland
diyAudio Member
 
Join Date: Sep 2012
Sprayed today, Matt black with a silver flec, happy with it!
Now to wire the fecking thing!!
Click the image to open in full size.

Click the image to open in full size.
Click the image to open in full size.
Getting primed-
Click the image to open in full size.

Last edited by ron1; 26th November 2012 at 07:43 PM.
  Reply With Quote
Old 27th November 2012, 11:12 AM   #3353
diyAudio Member
 
viktor89's Avatar
 
Join Date: May 2011
Location: Copenhagen
Send a message via Skype™ to viktor89
Wow, this one's gonna be a beauty! Can't wait to see the final results!
  Reply With Quote
Old 2nd December 2012, 08:53 AM   #3354
diyAudio Member
 
Join Date: Nov 2012
Location: Melbourne
Hi guys, thanks so much to Saturnus for this design and everyone else for the tips. I'm starting a Boominator build and would love some advice re combining solar and mains battery charging. (I have read this entire thread and searched many phrases before posting!)

Can I mains charge, and run the amplifier at the same time?

Here's my workings-out.

I will have two 12v, 7Ah SLAs, fed by 2x10w amorphous panels, into a 10A solar controller. I will mostly run from solar, but want to use the Boominator at home sometimes too, preferably listening to music while trickle-charging from mains at the same time.

I will take danielwritesbac's advice of:

"Put TWO low voltage schottky diodes into the input + port of your charge controller.
The diode's stripe goes closest to the charge controller.
Connect the solar cell to one of the schottky.
Connect laptop charger (SMPS) to the Other schottky. "


From what I have read (Frequently Asked Questions – Exegon Battery Chargers), I think it is safe to have a laptop 12v supply charge my SLAs, and run the AMP6 load at the same time. As long as:

1) While charging the SLAs, the DC load current should be ≤ 20% of charger's current rating.
AMP6 max current draw is 350ma, so, laptop charger needs to be minimum 1.75A.

2) A charge regulator also needs to be present, so if there is a battery on charge voltage increase, this doesn't affect the AMP6. I assume a solar controller would take care of this?

3) Finally, I've read that the max amp rating of a charger should be ≤ the battery Ah rating / 5. So, for two 7Ah SLAs (14Ah), this would be a maximum charger rating of 2.8a/h.

4) It appears OK to have two separate inputs feeding into the solar regulator, via schottky diodes, and leave these constantly connected.

Does all of this sound right? Is there any specific type of wiring I should do? I'm assuming the 4th question means I'm parralel wiring the solar and mains chargers, which is the right thing to do (in case panels add charge while mains charging).


Thanks for any help. I'm compiling a list of found answers to my n00b questions, in a google doc, which I will post for others once boominator is completed.
  Reply With Quote
Old 3rd December 2012, 12:23 AM   #3355
diyAudio Member
 
Join Date: Nov 2012
Location: Melbourne
I may just be a little too worried about this. Perhaps I'll just for out for a proper 2A smart charger, connect it to the solar controller input with diode and see what happens.
  Reply With Quote
Old 3rd December 2012, 04:50 AM   #3356
diyAudio Member
 
bitSmasher's Avatar
 
Join Date: Jun 2012
Location: Sydney.Au
Sorta relevant, to the Australian builders... Jaycar knocked $10 off their 7.2Ah SLA for December
7.2 Amp Hour 12V Sealed Lead Acid Battery - Jaycar Electronics
  Reply With Quote
Old 6th December 2012, 02:36 AM   #3357
diyAudio Member
 
Join Date: Dec 2012
Quote:
Originally Posted by bitSmasher View Post
Sorta relevant, to the Australian builders... Jaycar knocked $10 off their 7.2Ah SLA for December
7.2 Amp Hour 12V Sealed Lead Acid Battery - Jaycar Electronics
Also relevant to me in NZ, same discount over here, thanks for the tip.
7.2 Amp Hour 12V Sealed Lead Acid Battery - Jaycar Electronics
  Reply With Quote
Old 6th December 2012, 02:49 AM   #3358
diyAudio Member
 
Join Date: Dec 2012
I have looked through the thread but cant find an answer (or one that I can understand anyway). I am finally going to be building a Boominator (been waiting to be able to for a few years now!) , but in two halves, so you can unclip them and just use one, or get some separation between l/r channels. So each half will be mono with 2xHP10W+2xTweeter+Amp+battery. For the amps I have two TA2020's, I know you cant bridge the channels. Would it be better for me to use just one channel of the amp into both speakers (@ 4 ohm), or one channel per speaker( @ 8 ohm)? Hope that makes sense!
  Reply With Quote
Old 6th December 2012, 06:29 AM   #3359
diyAudio Member
 
Saturnus's Avatar
 
Join Date: Jun 2005
Location: Copenhagen, Denmark
Build it like a halfinator with an extra passive part. Just wire the speakers as normal for the halfinator and use a switch to wire them as normal for a full Boominator when the extra part is connected. Remember to make it fool-proof so people can't accidentally switch while playing. For example by using a key switch. That way you only need amp.

Alternatively just build 2 halfinators and use splitter cables so you get mono in each when you want to use them in stereo.

Last edited by Saturnus; 6th December 2012 at 06:35 AM.
  Reply With Quote
Old 6th December 2012, 09:30 AM   #3360
diyAudio Member
 
Join Date: Dec 2012
Thanks for the reply Saturnus. The halfinator is stereo tho yes? I assume this has drawbacks, eg two halfinators /= 1 boominator? I already have the two amps, maybe I should ask; what is the best way to wire up one mono halfinator, with a 2 channel amp. It seems the only way to get all the information (eg It seems hard to find simple info like 'Just wire the speakers as normal for the halfinator' is to read the entire 300+ page thread, so that's what I'm going to go do now
  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 10:08 PM.


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