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Old 14th January 2003, 03:05 PM   #221
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Removed the .php and "Stuffit" generated the pdf file. Thanks.

SMathews
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Old 15th January 2003, 03:04 PM   #222
uli is offline uli  Austria
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Lightbulb minor adjustments

...some 'minor' adjustments:
as BCs were running to their limits, swapped with BD140,
added a 4th pair of Powerfets, downscaled the bias by adding 47k
in the currentsink, changed resistors in the sink from 1k5 to 1k6
and 1k to 910R to reduce turn-on transients, added standby-
relays, (not drawn) doubled powersupply to 2x 500VA, 2x18V

...have to think about buying stocks of some aluminium company...

Uli
Attached Files
File Type: zip xa1_v3.zip (31.4 KB, 1180 views)
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Old 8th August 2003, 11:33 PM   #223
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Default Success!!!

Thanks to all those who offered encouragement along the way.

I have now tested the unit in a workbench and it worked flawlessly - it is too early to give distortion figures as this will be a function of build quality etc. The design is essentially that of page 1 (with minor resistor changes) + a VBE multiplier at the output instead of the simple resistor (which should work as well, but which does not provide negative temperature coefficient).

The only real trouble (apart from time and mechanical work) was:
1. Understanding circuit and it's inherent trickyness in adjustment
2. Having adequate heatsinking on the input stage, particularly bottom current sources. Naturally version 3 will have much more significant heatsinking, and probably higher currents as well. I am now at 30mA for each of the two legs.
3. Next version will have autobiasing of all current sources even though current setup appears very stable.

I have aquired a truly excellent case and plan to run this unit in 2 modes: 100W with 10W Class A switchable to 100W with 50W Class A (yes, I know this requires huge heatsinking, but it is intended for winter use.) For various reasons, the unit is presently set up for 600W output so I will have to lower the gain. Even without my planned emitter follower, the driver stage did not have any trouble driving a bank of 16 high capacitance IRF TO3P devices cleanly and without loss of amplitude at 110V peak to peak to 100KHz which was my highest frequency generator.

I am considering switched mode power which would make a lower powered Class A device easily attainable through switching the rails.

Petter
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Old 8th August 2003, 11:38 PM   #224
halojoy is offline halojoy  Sweden
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Thumbs up Great Petter!

you are one piece of "diyAudio.com" history

among others
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Old 9th August 2003, 12:30 AM   #225
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That is the nicest thing I have heard in a long time, halojoy! Thanks!

Petter
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Old 9th August 2003, 12:46 AM   #226
MikeW is offline MikeW  United States
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Please post some pictures. Good job.
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Old 9th August 2003, 10:33 AM   #227
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so great project, i like this prototype. this thread will continue
longer.
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Old 9th August 2003, 10:47 AM   #228
AuroraB is offline AuroraB  Norway
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Great news , Petter.. Congrats..



AuroraB

currently on vacation in "Siddisland"....
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Old 9th August 2003, 01:24 PM   #229
halojoy is offline halojoy  Sweden
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Default Re: Success!!!

Quote:
Originally posted by Petter
Thanks to all those who offered encouragement along the way.
....
2. Having adequate heatsinking on the input stage, particularly bottom current sources. Naturally version 3 will have much more significant heatsinking, and probably higher currents as well. I am now at 30mA for each of the two legs.
.....
Petter
So you are already
"on the way"
to next version .....


This is also typical for mankind:
will we ever be content and happy
with the good things we have
lay back
and enjoy

The rich ones want to get more money, and more ...

This is UN-Natural
Ever seen a Cat or Dog, after it has gotten
some food to eat

That is Natural Way to be.
Laid back and content
Enjoying, just the fact you are alive

When you are dead - it will be too late
to be happy & content
with your life

/halojoy 2003

halo relax now, dear petter - put on some of best lovesongs
take a rest
In Good Music
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Old 22nd September 2003, 09:51 AM   #230
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Default uli: hi

why do you use 470u paralleled by zener between output and 910R resistor in your xa1.v3 amplifier? mayber for self-boot?
i dont understand ,why?
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