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Old 19th November 2001, 07:37 PM   #31
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Join Date: Jul 2001
Location: The Netherlands
Hi Ebrewste (?)...

your idea reminds me of a webside that features some 'zero offset J-FET buffers schematics' ... I think you need a symmetrical voltage supply for that... which I just happen to dismis .. :-) it makes things even simpler and cheaper .. .. futhermore .. a balanced design can reduce second order harmanic generation by a factor of 10 or even more ..

I also think that DC offset in a Headphone is deadly for lineairity of the transducers... I have no measurements on this subject.. but speakers can rely on the compliance ratio of their BOX design and (open) headphones can not, headphones are typically 1000x more sensitive than speakers..I do not want 1 mV offset or more!

Still a SOZ for headphones appeals to me .. maybe a DC-offset monitor would be nice , so I could manualy adjust offset by a trimmer.....

greetings,
Thijs



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Old 19th November 2001, 07:45 PM   #32
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Join Date: Jul 2001
Location: The Netherlands
I just went on simulating again ... . this time with great results..

I desided to use a POWER MOSFET.. because of the reply of N. Pass ..

I tried IRFP140's mosfet folower, biased by a 47 Ohm resistor at 130mA.

this seems to be more lineair than a IRF510 or IRF610 at 200mA.. but they also have a higher Cap. than the IRF510's

hmmmmm.... a SOZ design might only be of benifit when it's driven by a BOSOZ or something like that...
..

Wouldn't this be a great addition to the Pass projecs?? ;-)


greetings,
Thijs


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