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Headphone amp idea....
Headphone amp idea....
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Old 27th May 2005, 03:08 PM   #21
Russ White is offline Russ White  United States
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higher available current and lower impedance to gnd are two reasons I can thinks of. Also no quiescent current draw for virtual ground. its a "real" ground.
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Old 27th May 2005, 05:52 PM   #22
tobias_svensk is offline tobias_svensk  Sweden
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If your not worried about one of the batteries getting discharged faster than the other i can't se any reason to have the 2426 (i maybe wrong)
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Old 27th May 2005, 06:14 PM   #23
00940 is offline 00940  Belgium
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The designer of the pimeta explains at the beginning why he doesn't trust two batteries to discharge equally. The main concern is that when batteries near zero, which coud happen if you let the amp on with music playing too long (getting asleep, leaving the room, and so on), DC offset could go through the roof and destroy the headphones. There are some posts about that on headwize.
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Old 27th May 2005, 07:43 PM   #24
Lovan is offline Lovan  Sweden
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Yes DC offset is a big problem but only if one rail is A LOt higher voltage-vise i.e. one rail is disconnected. I have found that the effekt is not killing if your using a high impedance headphone(300ohm).
The dc output is about one rail at worst.

I think itīs still usable but with cauton. Somehow you have to monitor the batteries status.
If your using big sealed lead-acid batteries(4-7 Ah) the dc-offset is not a really big problem either. The amp draws about 40mA per batteri. Thatīs stereo. So with the 4Ah batteries you still have 100 hours use without any problem.

Caution though, my experience is limited to high impedance phones. But if DC is a problem you can use output caps.
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