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[Official] OCN Headphones and Earphones Club - Page 1120

post #11191 of 38091
Beyerdynamic DT 990 Premium 250 Ohm
Audio Technica AD700
All being powered by a Asus Xonar Essence ST
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post #11192 of 38091
Alright I have a question about the O2 on battery operation (forgot my damn charger), has anyone else drained the batteries yet? I think I drained mine as when the power switch is set to "on" (pushed in) the LED is red, however at no volume or gain settings do I hear output from several sources (I also tested the sources into the line in of my E7 and they work). I am just curious as NWavGuy's documentation says the amp shuts itself off if the power is drained, but does the LED stay on?
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post #11193 of 38091
Quote:
Originally Posted by rdrdrdrd View Post

Alright I have a question about the O2 on battery operation (forgot my damn charger), has anyone else drained the batteries yet? I think I drained mine as when the power switch is set to "on" (pushed in) the LED is red, however at no volume or gain settings do I hear output from several sources (I also tested the sources into the line in of my E7 and they work). I am just curious as NWavGuy's documentation says the amp shuts itself off if the power is drained, but does the LED stay on?

Then it probably isn't drained. If it was, then the LED shouldn't, unless it's leftover power insufficient to amp anything.
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post #11194 of 38091
I've never actually drained the batteries all the way, but the quiescent current draw of some of the components is definitely nontrivial, so if you leave it on and not playing, it will drain the batteries.

If the power switch is in, the LED will be lit even if the power management shuts the rest of the circuit off. This is normal behavior. Actually, the LED is part of the power management circuit itself (the voltage across it is used by a comparator, pretty much).

460
Top section - AC power and battery; Middle section - power management (shutoff circuitry); Bottom section - amplifier input, gain stage, output stage

Notice that the LED, which is D7 in the left side of the middle part of the diagram, is pretty much between the positive supply rail (the line corresponding to the number 3 on the switch in the upper-right) and negative supply rail (6) with nothing in between but the resistor R6. Even if you don't analyze what's going on with the comparators, you can see that if the power switch is turned on and thus the batteries connected, even if the batteries have a voltage below the circuit shutdown threshold, they will will turn the LED on.

If the voltage from the power supply (AC or battery) is too low, then the middle power management section will make sure that the bottom section gets something like 0V on V+ and V-, thus effectively shutting it off and causing minimal power draw for the whole system.

Actually he mentions this explicitly somewhere:
http://nwavguy.blogspot.com/2011/08/o2-details.html
Quote:
Power LED – This tells you the amp is on. If the batteries are low the amp may not operate but the LED will remain on as a reminder to turn the amp off (and hopefully charge it soon).

Edited by mikeaj - 2/19/12 at 11:33am
post #11195 of 38091
Thanks for the replies guys! I must have missed that bullet point when I read over everything.
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post #11196 of 38091
I'm surprised I could get some of that right by guessing.
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post #11197 of 38091
Audio-Technica ATH-M50
Sony MDR-V250V
Asus Xonar DG

I'm a legitimate wizard!
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post #11198 of 38091
Ended up buying an entire new sound setup thanks to everyone here at OCN!

Sound Blaster X-Fi Titanium
AD-900's

The AD-900's I was so hesitant about because I've never used headphones for long term gaming and I am IN LOVE with them. Best purchase in a very long time thumb.gif
post #11199 of 38091
I'm still rocking the Beyerdynamic DT-770 pros with a Audio-GD sparrow. I am eagerly awaiting the arrival of NwAvGuy's desktop Odac headphone amplifier. IMO everyone with a set of headphones should have one of these when they come out, that guy has really changed my perspective on the sound industry in general.
post #11200 of 38091
Since from my previous mention of IE8, Razer megalodon and HD598

My complete list:

Sennheiser HD650 modded, HD598, IE8, PXC 360, PC 350, CX6, Sony MDREX500LP and MDRNC33B

Razer 7.1 Megalodon gaming headset

Components:

Creative Music Premium HD USB and Xi-Fi Titanium HD soundcard, Cambridge DACMagic, Lennhman Rhinderlander headphone amplifier
Edited by aus_colin - 2/23/12 at 2:38pm
     
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4.2GHz OC 1090T Modded Gigabyte GA-990FXA-UD5 (Reversed Heatsink)  HIS HD 5970 flashed  XFX HD 5850 Non reference  
RAMHard DriveHard DriveHard Drive
16GB Corsair XMS3 1768MHz Corsair F60 x8 Raid 10  Smsung F3 x6 Raid 5  2x External WD 1TB HDD of different make  
Optical DriveCoolingCoolingCooling
Benq DVD±RW Noctua NH-D14 Tri-Blue LED fans  Arctic Cooling Xtreme 5970  Arctic Cooling Twin Turbo Pro 5850  
CoolingOSMonitorMonitor
Zalman 6CH Fan Controller  Windows 7 Ultimate 64bit benq V2420H LED Benq G2222HD LED 
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Logitech G110 IKONIK VULCAN 1200W 80PLUS Antec 1200 Light Modded Microsoft Sidewinder  
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Random mousepad  Creative Xi-Fi Titanium HD  Logitech X-540 speakers  Razer 7.1 megalodon Headset  
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2x Roccat Taito  Creative premium HD USB soundcard  Cambrdige DACMagic  Lennhman Rhinderlander Headphone amp 
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