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maemo.org - Talk (https://talk.maemo.org/index.php)
-   Multimedia (https://talk.maemo.org/forumdisplay.php?f=32)
-   -   DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...) (https://talk.maemo.org/showthread.php?t=74341)

dr_frost_dk 2011-07-12 12:36
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
3 Attachment(s)
Just got a bunch of chips, 5x 2012 & 3x 2016

And can report that the 2016 is also very good, of course you need >10V to use it, but i have ordered some boost converters, and with the boost converter the amp for the N900 will be extern since it will take some space, but not more then a box of matches total, and thats pretty good for a 2x10W amp :)

here is the test model i just put together, battery powered from a 10000mAh 14.8V Transmetic RC battery.
Attachment 21313
Attachment 21314
Attachment 21315

Estel 2011-07-12 18:28
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
I'm afraid that with boost converter, battery drain problem may become significant (ho ever, who knows - using 3000 mAh battery... ;) ).

BTW, using N900 with 2x3W amplifier inside cover, then connected to 2x10W amplifier outside, then to speakers - that would be "amusing", to say at least.

Now I'm waiting for someone to mod FM transmitter antenna in a way that we can connect it to pro ~10 meter antenna (or any steel mast with copper crocodile clips) and start pirate radio station ;)

dr_frost_dk 2011-07-12 19:43
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
Quote:
Originally Posted by Estel (Post 1049665)
I'm afraid that with boost converter, battery drain problem may become significant (ho ever, who knows - using 3000 mAh battery... ;) ).

BTW, using N900 with 2x3W amplifier inside cover, then connected to 2x10W amplifier outside, then to speakers - that would be "amusing", to say at least.

Now I'm waiting for someone to mod FM transmitter antenna in a way that we can connect it to pro ~10 meter antenna (or any steel mast with copper crocodile clips) and start pirate radio station ;)
When i get it i will measure power drain :)
But having 2x10W really rocks, there is a noticeable difference from the 2x3W, and even thinking about getting a pair of the 2x15W.

And i been thinking of the antenna thing to, also a gsm for when you are out and about where signal is scares, it happens....
One thing i have noticed tho is when having a USB cable in (not connected at other end) it acts like an antenna, it helps a little bit.

SSLMM 2011-07-12 23:52
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
As i said yesterday here are a few clips recorded from my old n93 ( best stereo sound capture i have in the moment, but stupid focus).

"Normal" music (voice and instrumental):
http://www.youtube.com/watch?v=ovC7UH6fiXA

Instrumental music:

http://www.youtube.com/watch?v=C0ywByoib08

Trance music:

http://www.youtube.com/watch?v=oILJ68JxgRk

;)

dr_frost_dk 2011-07-13 00:01
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
Does help some, just need a lowpass filter to get the best out of it.

Maybe i should make a video with my dock, tho it is not the best sound, it is however more sound :)

Estel 2011-07-13 02:59
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
As for better WIFI/GSM antenna, there is topic somewhere on this forum, where one guy posted picture of his N8xx device with modified stock case - he implemented micro connector for external Wifi antenna ;) I don't think that this could be much harder on N900... Haha, it seems that all modders think about similar modifications, @ some point.

Ps.

Using N900 with 2x15W amplifier is RIDICULOUS, lol. I see police report "Suspect was disturbing neighborhood in 2 miles diameter, using music from mobile phone..." ;)

laasonen 2011-07-13 05:09
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
Quote:
Originally Posted by Estel (Post 1049916)
Using N900 with 2x15W amplifier is RIDICULOUS, lol. I see police report "Suspect was disturbing neighborhood in 2 miles diameter, using music from mobile phone..." ;)
For 9.8 minutes until suspect's battery ran out :D
Code:
(3.7*1.32)/(2*15)*60

dr_frost_dk 2011-07-13 11:42
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
Quote:
Originally Posted by laasonen (Post 1049946)
For 9.8 minutes until suspect's battery ran out :D
Code:
(3.7*1.32)/(2*15)*60
No more time here with 3000mAh :D

and you have to take RMS instead, and then it is more like

Code:
(3.7*3.0)/(2x7.5)*60
then the party can go on for 44.4minuts - N900 power usage.
But hey a small 30min party. :D

Next mod for me is my BT speaker, it will get the 2x10W and Boost converter, it can play really loud on the 2x3W but before it was BT it was just the case and an external 12V 2x20W amp.

But if the 2x10W works fine im going to 2x15W :)

azy141 2011-07-13 15:11
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
if i brought this 3W x 2 could i still connect it to the single n900 battery i have or would i have to order two of those scuds? and the big cover?

dr_frost_dk 2011-07-13 15:23
Re: DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...)
 
Quote:
Originally Posted by azy141 (Post 1050221)
if i brought this 3W x 2 could i still connect it to the single n900 battery i have or would i have to order two of those scuds? and the big cover?
if you can fit a connector to your N900 then yes.
Another way is to fit a battery to the amp itself, but you have to figure out how to charge it then.

Don't need big cover or scud battery for this.


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