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Old 29th August 2005, 12:57 AM   #321
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Warmed up. You'll find that they drift a fair amount when the amp is just turned on, but after twenty or thirty minutes or so, you'll get pretty stable values.
The absolute value isn't really all that important unless you intend to run the amp near full power. The relative offset is the one to watch out for. Parts matching is your first line of defense. Then the circuit embellishments to fine tune things.
Around this point, someone frequently pops up asking about using a servo. Yes, it can be done. No, it's not necessary to go to those lengths.

Grey
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Old 29th August 2005, 01:58 AM   #322
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GRollins
"The relative offset is the one to watch out for. Parts matching is your first line of defense. Then the circuit embellishments to fine tune things"

thats what ive said, if you aim for high precision match! and use
high precision components, high quality is the number 1 factor
here

if you cant attain these matches in components just follow
the 5 ways mr Pass has talked about

Mr pass thank you for the links
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Old 29th August 2005, 03:27 AM   #323
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The other things are in addition to matched components, not instead of.

Grey
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Old 30th August 2005, 01:19 AM   #324
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in addition?well i guess mr pass is on to something big
good luck
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Old 6th September 2005, 01:36 PM   #325
Villaw is offline Villaw  Cyprus
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Petter

I would be very much interested to have a look at your last design of the x100 since Nelson doesn't mind about it.
Another thing though, using 12 pairs of fets for 100w per channel is indeed an overkill unless you plan to go up to 600w with the same circuit?
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Old 8th September 2005, 08:01 AM   #326
B.L. is offline B.L.  Poland
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Nelson wrote: "...so on the X350 we used a current mirror for a level shifter."

Could anyone explain how to do it on X100?
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Old 9th September 2005, 07:04 PM   #327
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Quote:
Originally posted by B.L.
Nelson wrote: "...so on the X350 we used a current mirror for a level shifter."

Could anyone explain how to do it on X100?
Well, you know what a current mirror is - there are plenty of
examples on this site. You source a certain amount of current
into it and you get a certain proportional amount out. The
ratio between input and output are arbitrary, and when the
ratio is unity, it's a level shifter.
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Old 9th September 2005, 07:57 PM   #328
zinsula is offline zinsula  Switzerland
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Uhmm, could be something like this?

The frontend in this thread is single ended, so I drew it this way. Could also be complementary I guess.

Not sure if it would work.
But it's more a conceptual schematic anyway. All this resistor values guessing...

Ciao, Tino
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File Type: gif se current mirror frontend.gif (52.3 KB, 3679 views)
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Old 9th September 2005, 08:17 PM   #329
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Yes, that would be an example.
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Old 9th September 2005, 09:43 PM   #330
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Now that's a cool use of the current mirror.
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