DIY Audio thread, show you DIY audio 'equipment' (Amps, BT etc...) - Page 7 - maemo.org

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azy141	2011-07-13 , 16:16
Posts: 63 \| Thanked: 2 times \| Joined on Mar 2010 @ United Kingdom	#61

so i would need to get some solder and a short 3.5mm to 3.5mm the one i have is like 2 metres long

i only have like £13 atm lol so i need to make sure i can get everything in

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	dr_frost_dk	2011-07-13 , 17:37
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#62

Originally Posted by azy141

so i would need to get some solder and a short 3.5mm to 3.5mm the one i have is like 2 metres long

i only have like £13 atm lol so i need to make sure i can get everything in

yes get a short one

don't know if you can fit a plug in the N900 (stock cover).
or do you plan to have a battery on the amp, you can place it under the circuit board of the amp, im still asuming that you buy the board with the chip?

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azy141	2011-07-13 , 19:14
Posts: 63 \| Thanked: 2 times \| Joined on Mar 2010 @ United Kingdom	#63

i was gonna try and just get wires coming out from the side of the back cover so its not fully on. and yeah im gonna get the board with the chip the one in the link i gave that you gave,lol. my parents dont give me alot of money so i need to save up to make it proper lol. im only 16. im gonna need like £30-£40 right if i wante the mugen cover+2scuds+amp

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	dr_frost_dk	2011-07-13 , 19:35
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#64

Originally Posted by azy141

i was gonna try and just get wires coming out from the side of the back cover so its not fully on. and yeah im gonna get the board with the chip the one in the link i gave that you gave,lol. my parents dont give me alot of money so i need to save up to make it proper lol. im only 16. im gonna need like £30-£40 right if i wante the mugen cover+2scuds+amp

Yes thats about right, there is the cheaper dual 'christgift' option (2500mAh) but it's up to you.

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azy141	2011-07-14 , 16:03
Posts: 63 \| Thanked: 2 times \| Joined on Mar 2010 @ United Kingdom	#65

if i buy the christgist can i use it with the original nokia i have?

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	Estel	2011-07-14 , 16:38
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#66

Better not - if You connect batteries together, always use same chemistry (OK in this case), capacity, state of charge, and try to make batteries at least cycled equally, if not just new.

Of course mixing types will work, but Your capacity will be limited to 2x less effective battery capacity, and even batteries of exact same capacity, but from different manufacturers, may age differently. It's just a waste of better battery potential.

I understand Your limited budget, but better save for 2x christgift's + mugen cover, than mix one new battery with stock nokia one. More cost-efficient in long term

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azy141	2011-07-14 , 17:22
Posts: 63 \| Thanked: 2 times \| Joined on Mar 2010 @ United Kingdom	#67

Originally Posted by Estel

Better not - if You connect batteries together, always use same chemistry (OK in this case), capacity, state of charge, and try to make batteries at least cycled equally, if not just new.

Of course mixing types will work, but Your capacity will be limited to 2x less effective battery capacity, and even batteries of exact same capacity, but from different manufacturers, may age differently. It's just a waste of better battery potential.

I understand Your limited budget, but better save for 2x christgift's + mugen cover, than mix one new battery with stock nokia one. More cost-efficient in long term

thanks for your help. i'll just save up and then order the three things when i get enough =D

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	dr_frost_dk	2011-07-16 , 10:32
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#68

got my boost converter today.

Input 4v - Idle current 144mA
Output 15.2v

so only 0.5W idle, thats not bad at all.
EDIT: and that connected to amp and speakers.

Next task now is to add it to the BT box, and this time maybe add it inside

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Last edited by dr_frost_dk; 2011-07-16 at 10:44.

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	Estel	2011-07-16 , 13:02
	Posts: 5,028 \| Thanked: 8,613 times \| Joined on Mar 2011	#69

Before anyone ask, for N900 that would be bad. 0.5W is 10% of normal battery, and about ~4% of dual-scud. For hour.

so, with N900 better stick to the 2x3W amp

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	dr_frost_dk	2011-07-22 , 21:01
	Posts: 1,503 \| Thanked: 2,688 times \| Joined on Oct 2010 @ Denmark	#70

about the PMPO talk, i will just bring these up, i just found on EBAY.

NEW-EVO-LABS-PC-Laptop-computer-USB-Speakers-2-0-280W

The Specs
Magnetically shielded
Build in amplifier
Drive Unit: 3" Speaker
Controls: Volume, Power, LED
RMS Power: 2CH x 1.5W
PMPO: 280W
Voltage: USB powered
Frequence Response: 20Hz-20KHz
Separation: >= 40dB
Size: 78 x 85 x 185MM
S/N Ratio: >= 45dB
THD: =< 0.5%

Here we see 2x 1.5W RMS and 280W PMPO!!!!!!!!!!!!!
Also note that these extreme speakers are able to go down to 20Hz!
But goddamm S/N of over only 40dB?, if this is the case all you will hear is static, my home amp has an S/N beyond 105dB and crappy 80' amps had S/N over 80dB, so 40dB would not be a stat i would post, and i know that it has more....

--------------EDIT-----------------

Just found the same stupid speakers from another seller, but here they claim 600W PMPO!!!!

http://www.ebay.co.uk/itm/600W-USB-C...item4cf894046d

But at least the specs are more honest
Freq response 80Hz-20KHz

NOTE: When powered from USB like these are there is only 2.5W Power to use, this will change when someone makes a USB 3.0 version.... then 7.5W

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Last edited by dr_frost_dk; 2011-07-22 at 21:19.