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Old 16th July 2007, 05:53 PM   #181
TOINO is offline TOINO  Portugal
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Old 16th July 2007, 11:51 PM   #182
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Quote:
Originally posted by TOINO
I have only one layout question:
From where do you sense the feedback signal on your big output cooper area?

From a little track extension at the end, between the last emitter resistor and the output point. Basically, the point at which the only track current flow is to and from the load.

Cheers,
Glen


PS
Your amp looks really nice, but I reckon your power rails and output copper area are much longer than mine
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Old 17th July 2007, 02:07 AM   #183
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Quote:
Originally posted by G.Kleinschmidt

PS
Your amp looks really nice, but I reckon your power rails and output copper area are much longer than mine
You are right about copper length; that fact alone justifies unusual layout.

http://www.diyaudio.com/forums/showt...98#post1212098
This topology simplifies things a lot… output could be the dissipator… and no transistor insulators…
In that case big output node antenna/capacitance is gratis… …be care..sensitive circuits..

Additionally it is very easy to force and sustain high output impedance for soft-start-up or protection proposes.

Also I have not output coil mostly because of this http://www.diyaudio.com/forums/showt...53#post1213653
Instead of that, I guarantee you that the amplifier is rock stable mainly because of the layout.

Anyway, your propose is different. Your amplifier is class-A (more precisely, Frankenstein class-A ) and mine has to many compromises to be classified on your race.
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Old 17th July 2007, 02:18 AM   #184
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Quote:
Originally posted by TOINO
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Nice heatsinks....
This is hot water heating rad:
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Old 17th July 2007, 02:40 AM   #185
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Besides you have “real thermal mass” to handle power peaks…
And they are very easy to build, if you could live with the required fan (noise).

Indeed, very efficient and compact at ground (pcb) level…
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Old 9th September 2007, 08:31 AM   #186
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Glen are you still building and testing this thing, im still interested to hear about the results?
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Old 9th September 2007, 10:06 AM   #187
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Quote:
Originally posted by Craig405
Glen are you still building and testing this thing, im still interested to hear about the results?

Still building, working well so far, but not nearly fully operational yet.

Cheers,
Glen
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Old 9th September 2007, 12:50 PM   #188
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Hi Glen,

Quote:
http://users.picknowl.com.au/~glenk/HOME.HTM
Your "home.htm" is missing.
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Old 10th September 2007, 01:21 PM   #189
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G'day.

The whole site is now down (and will be for probably quite a while), being revamped and updated.

Cheers,
Glen
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Old 12th September 2007, 01:56 PM   #190
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