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Old 14th January 2004, 01:14 PM   #31
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Amp_man,

My take would be on bridging into a 4 ohm load at +-75 volt rails, each amp driving a 2 ohm load at 600 watts RMS. 1200 watts RMS into 4 ohms and over 2000 watts peak!
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Old 14th January 2004, 02:37 PM   #32
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hi

amp man looks like you ve managed to get your hands full !

let the boys know every time they touch 2 ohms loadf they should brace them selves with a power supply to match !

oh by the way any probs with current sharing when you parallel these mj s

neways take care

OH ABOUT HOLTON HIS CIRCUITS WORK ,


suranjan
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Old 14th January 2004, 02:38 PM   #33
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Then I can now move to amp with following specs
Supply+-75VDC
600WRMS@2 ohms
output devices=MJL21196 only NPN are permissible in my designs
drivers=MJE15032/15033
pre drivers=MJE340/350
filter caps=6 X 10000MFD/100V atleast
4 X 55V @2.5KW Pure IRON CORE (no toroidals are allowed in my design)
2 X 4.7" AC mains voltage Fans for cooling (no variable speed DC fans are passed in my authority)
Every body agree upon it or not??
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Old 14th January 2004, 03:28 PM   #34
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Quote:
Originally posted by Matttcattt
could this amp run at +/-115vDC? if i take 230vAC mains, without a transformer, it would bhe easy to get this voltage.

whats wrong with mains? +/-120v is more than mains.
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Old 14th January 2004, 03:32 PM   #35
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There is nothing wrong with mains (as such), but we don't allow forum discussions when amplifier is powered directly from mains, without an isolation transformer. It should be clear to everybody.
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Old 14th January 2004, 04:09 PM   #36
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ThanX to PETER for reminding everybody!

SO FOLKS here is the proposed schematic
Attached Images
File Type: jpg qamp.jpg (47.2 KB, 1831 views)
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Old 14th January 2004, 04:21 PM   #37
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Quote:
Originally posted by Peter Daniel
There is nothing wrong with mains, but we don't allow forum discussions when amplifier is powered directly from mains, without an isolation transformer. It should be clear to everybody.
Rather I would say there definitely is something wrong with
it, or the rule would just be a rule for its own sake.

Whether you have a transformer or not, it is danagerous to poke
around inside an amp with high voltages, and even 24 V or even
less can be dangerous in certain circumstances. However, what
is most important is that the amp is safe to use when the hood
is on. If you power it directly from the mains with no transformer,
and something goes wrong, you can end up with the chassis
(if not grounded) or the speaker outputs at mains level voltage
relative to earth. That is lethal. If you have a transformer and
the same thing happens, you get an equally high voltage, but
because of the transformer it is floating with respect to earth.
That means that basically you could touch the faulty amp with
one hand and a water pipe or whatever with the other hand
without getting shocked. Don't try this, though, it can still be
dangerous and isn't supposed to happen. It is just meant to
illustrate that a transformer reduces the risk of hazards, although
it doesn't elliminate it completely. Of course, things must be
properly and safely wired on the mains side of the transfomer.

Also remember, never touch both terminals of a speaker output
at the same time, because you can have a high voltage
between these.
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Old 14th January 2004, 04:26 PM   #38
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amp_man_1, how do you guarantee an equal load sharing
between the parallel driver devices since they have no individual
emitter resistors?
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Old 14th January 2004, 04:31 PM   #39
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HELLO HUNTER The metropolitan city man!
Where u been around these days, quite busy indeed man.

NOw regarding the current sharing of MJ's

"I have passed a written order under my authority to MJ'S to share the current which will be given to them or unless there is a risk that they can be eliminated from my schematic"

So dont worry man , MJ'S are my loyal PETS Since2001 , they are sharing current in equal amounts .

AND what about ur subwoofer pricings details PLZ email me
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Old 14th January 2004, 04:39 PM   #40
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Quote:
Originally posted by Christer


Rather I would say there definitely is something wrong with
it, or the rule would just be a rule for its own sake.

Whether you have a transformer or not, it is danagerous to poke
around inside an amp with high voltages, and even 24 V or even
less can be dangerous in certain circumstances. However, what
is most important is that the amp is safe to use when the hood
is on. If you power it directly from the mains with no transformer,
and something goes wrong, you can end up with the chassis
(if not grounded) or the speaker outputs at mains level voltage
relative to earth. That is lethal. If you have a transformer and
the same thing happens, you get an equally high voltage, but
because of the transformer it is floating with respect to earth.
That means that basically you could touch the faulty amp with
one hand and a water pipe or whatever with the other hand
without getting shocked. Don't try this, though, it can still be
dangerous and isn't supposed to happen. It is just meant to
illustrate that a transformer reduces the risk of hazards, although
it doesn't elliminate it completely. Of course, things must be
properly and safely wired on the mains side of the transfomer.

Also remember, never touch both terminals of a speaker output
at the same time, because you can have a high voltage
between these.
I rather quickly realised that my original reply would definitely awake attention of members who are sensitive to this subject and safety overall, so I added "as such" for mains being just mains, if you are picky about the wording. We all need mains to operate our projects and that's all I meant.

Being moderator, I'm only enforcing forum rules, and honestly I don't care what member do at home and I know some of them will do what they want anyway.
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