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Old 22nd June 2004, 09:06 PM   #21
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Oh, yeah, I should mention that I have no clue what-so-ever as to why bipolars are used for the differentail pair, with the exception that maybe we are supposed to be looking at current feedback, which I tried to employ.
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Old 22nd June 2004, 09:07 PM   #22
grataku is offline grataku  United States
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Metalman,
the 100 ohm load on the diff seems a tad low, no?
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Old 22nd June 2004, 09:19 PM   #23
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I did that to get unity gain off the the differential pair for a 1K base resistor. I was running with the assumption of a 1V input and unity gain so that R1 and R2 only needed to drop 1V from the +rail to avoid clipping. That and I was trying to keep things to nice simple round numbers as a starting point.

Feel free to point out obvious errors, as I am a metallurgical engineer fascinated with an audio hobby trying to do electrical design, learning via the trial-by-fire method.
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Old 22nd June 2004, 09:29 PM   #24
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OK, the stupid-alarm just kicked in, and I realize that my configuration leaves the base of the bipolars at a high voltage whereas I need to have them somewhere near ground potential. I'll have a rethink of this and try to post something better later.
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Old 22nd June 2004, 09:35 PM   #25
grataku is offline grataku  United States
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Metalman,
I am just asking a serious question here OK? My questions are quick because I am work and constantly looking over my shoulders.
I am not an EE either. (though I know alot more than just electronics )
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Old 22nd June 2004, 09:47 PM   #26
roibm is offline roibm  Romania
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Quote:
Originally posted by grataku
Roibm,
Maybe you are right with all your environmentally conscious talk, but I think you are behaving like the guy that worries about adjusting his tie after falling into a pile of sh|t.
As I already posted, the post I made is not about environment and the like.
And don't come at me with power wasting is not that bad. It is bad for the very fact alone that it proves an extremely inefficient design.

BTW, your sh|t talking has anything to do with your avatar or your underpaid situation? Because is is strange, underpaid but happy to pay for class A energy bills?
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Old 22nd June 2004, 09:55 PM   #27
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Metalman, I see that you anticipate me.

The first schematic is now available in pdf at

www.passlabs.com/np/GC-SS-1a.pdf

This was intended to get some response while giving the
geniuses a chance to start filling in their own values.

Last night I filled in the values that I would start with - keep in
mind that none of this has been tested. This is found in

www.passlabs.com/np/GC-SS-1b.pdf

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Old 22nd June 2004, 09:58 PM   #28
grataku is offline grataku  United States
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Sorry Roibm, I guess you didn't get my metaphor...
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Old 22nd June 2004, 10:10 PM   #29
grataku is offline grataku  United States
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Thanks Nelson, this circuit should make everybody happy from the diehard gaincloner to the X aficionados.
It's got 2 Zobels, too!
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Old 22nd June 2004, 10:12 PM   #30
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by Nelson Pass
Metalman, I see that you anticipate me.

The first schematic is now available in pdf at

www.passlabs.com/np/GC-SS-1a.pdf

This was intended to get some response while giving the
geniuses a chance to start filling in their own values.

Last night I filled in the values that I would start with - keep in
mind that none of this has been tested. This is found in

www.passlabs.com/np/GC-SS-1b.pdf

Looks very interesting. I like added zobel network.

--
Brian
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