Have any of you experienced a shorter battery life of your 7th gen ipod whenever hooked via LOD rather than using the normal HP jack? It seems mine has a shorter life all of a sudden.
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Not sure if it has to do with current draw though the LOD pins. I believe the LOD send analog signal at max volume or max voltage bypassing the ipod's internal amp. Although, no load is present, possibly the ipod's internal amp is still on while the LO signal is being applied to the external amp. That could be the reason for fast battery drawl. I've noticed this with several DAPs. LO kills the battery quicker. Some DAPs have a DAC chip that has digital volume control, and you want to push the volume level close to maximum, and that should drain the battery quicker also.
Let's say the ipod's LO signal is 2V. This 2V is fed into the external amp. The amp's input has bias resistors, and the opamp will dissipate the current fed from the ipod to the external amp.
One thing I don't understand is, how it's draining so much if the input impedance of the external amp is very high. This means there will be small amount of current. Maybe, the max signal in the ipod is being dissipated inside the ipod.
Edited by SilverEars - 6/29/14 at 3:07pm