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Old 12th April 2009, 09:38 PM   #201
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I`m waiting for the new schematic.
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Old 13th April 2009, 02:13 AM   #202
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I'm still working on it...

A peek:
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Old 13th April 2009, 02:32 AM   #203
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Take a look at this:
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Old 13th April 2009, 03:17 AM   #204
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Quote:
Originally posted by Lumba Ogir
Take a look at this:

Looks familiar...
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Old 13th April 2009, 03:28 AM   #205
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Who was first?
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Old 13th April 2009, 03:34 AM   #206
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The chicken or the egg?

Carr, I think.

I'm just a rip off artist.
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Old 13th April 2009, 07:43 AM   #207
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C4 is still in the signal path.
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Old 13th April 2009, 08:21 AM   #208
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Nopes, unless j Carr worked for Luxman back in 1982, the luxman predates all these by by at least 20 years with the exact same voltage amplification scheme.

The funniest part is that so called western audiophiles used to and still do call japanese designs junk but are now copying their designs from near 30 year old amps and calling it high end.
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Old 13th April 2009, 08:54 PM   #209
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Quote:
Originally posted by Bernhard
C4 is still in the signal path.
Yes, that's not a problem for me.

Quote:
Originally posted by homemodder
Nopes, unless j Carr worked for Luxman back in 1982, the luxman predates all these by by at least 20 years with the exact same voltage amplification scheme.

Do you have this schematic homemodder? It'd be nice to see the original.

All my tinkering last night went out the window. Multisim locked up and shut down and I lost all of the progress I made (autosave is NOT turned on). I'll see if I have some time this evening to play some more.
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Old 14th April 2009, 01:13 AM   #210
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I ve lost half of my schematics, due to a harddrive failure but if I remember correctly the model is L500 or L450. Its the exact same circuit except Roender has a constant current source for the cascode whereas the luxman used a resitor to bias the cascode dynamically. Luxman also used a EF buffer before the outputstage but this was needed as it used a servo for dc offset instead of a cap at the feedback node.

Oh theres one more difference instead of leds, Luxman used diodes, the rest is exactly the same. The Luxman used a class A outputstage with it though. The design date was 1981 or 1982 , I remember this much because when I was looking at the schematic I was thinking heck I was only 10 years old back then.

I might still have a small hand drawn schematic of that inputstage because I wanted to try build a preamp out of it years ago but couldnt find the fets. I ll search the net again for luxman schematics, they have some excellent designs, years ahead of their time, I will most probably find this one.
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