Is the THS4051 OK for a Pimeta-like ground channel? | Headphone Reviews and Discussion - Head-Fi.org

Andrea · Sep 29, 2006 at 8:50 PM

My doubt is concerned with this op-amp's 2.5 uA input bias current alone.

This isn't a problem, correct? The ground channel's topology is the same as the Pimeta's (but with the THS4051 doing both the op-amp & the buffer), only with smaller value resistors in place of the two 4.32K ones. This circuit would normally use an LM6171, which has lower input bias current, but still a highish 1 uA.

Thanks

Andrea · Sep 30, 2006 at 7:15 AM

No clue? I'd better see by myself

Andrea · Sep 30, 2006 at 8:58 AM

OK, I got the answer. I was too lazy to change the battery of my multimeter.

DC offset = 4 mV at min. volume, decreasing further at normal listening levels. Thus, it's totally fine.

Btw. The THS4051 "sounds" better coupled with the AD8397/45048 than the OPA551 and the LM6171. And it has the nice feature of maintaining much of its full 100 mA output current even at its min. rated power supply (+/- 4.5V). Highly recommended.

Andrea

Banned - aka HeavySoul - aka inconnu - aka Albert - aka layman - aka joe_average - aka altglos - aka Mr boobi - aka mikesand - aka blindbuy - aka The Well - aka yummy-fi

Andrea

Banned - aka HeavySoul - aka inconnu - aka Albert - aka layman - aka joe_average - aka altglos - aka Mr boobi - aka mikesand - aka blindbuy - aka The Well - aka yummy-fi

Andrea

Banned - aka HeavySoul - aka inconnu - aka Albert - aka layman - aka joe_average - aka altglos - aka Mr boobi - aka mikesand - aka blindbuy - aka The Well - aka yummy-fi

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