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Newer battery - more distortion ?

post #1 of 3
4/26/11 at 9:59am
Thread Starter 
OK,I've build a simple pocket headphone amp.It's schematic is like the MINI3,except for virtual ground with two BJTs instead of opamp.Also,I'm using the LM4562.
I've been using it for some days,so the 9v battery is about it's half or less...gives 7.8v.I've bought a new one for the sake of better sound,but I measured the amp with the RMAA and 32Ohm headphones for load,and I made a comprasion:

500

Why ?
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post #2 of 3
4/26/11 at 10:46am

Did you change battery types? For example from a rechargeable to an alkaline or lithium type. Maybe even different brands of batteries? The internal impedance of the batteries could cause differences here.

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post #3 of 3
4/26/11 at 11:00am
Thread Starter 
Yes,that's the case.The old battery is conventional low-cost carbon Panasonic battery,the new one is alkaline Philips supposed for higher loads,etc.
Both are not-rechargeable.What's strange, is that it turns out,that the supply voltage is related to the distortion.I've applied 12v with a regulated LM317 supply,and I've got almost 0,7% THD.So,the higher the supply voltage,the higher the distortion?
I wonder is this the case with
this opamp only(because the rest is identical to MINI3) ?Currently I don't others to compare.
I use the Sijosae discrete splitter:
http://tangentsoft.net/elec/vgrounds.html

And no offset.Strange.
P.S. It's really audible that the amp sounds better with the old battery.
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