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Old 11th November 2002, 12:20 PM   #21
halojoy is offline halojoy  Sweden
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Them diode is a safety. To protect the Capacitor.
A capacitor destroys of too high voltage
or some volts negative.
Diodes make voltage never can go more than +-2 volt.

Normally diodes is not working.
If you use bipolar cap or Polypropylen, than there is no need, I think.
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Old 11th November 2002, 02:29 PM   #22
peranders is offline peranders  Sweden
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Another amp
Default Re: Re: Re: THE M250

Quote:
Originally posted by Drafance007

NO No What about naow 4 diodes 1n4148, what is their purpose ? ( D1-D4 ?
halojoy is right, the LED acts as a low voltage zener, 1.7-1.9 volts. (The no no thing).
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Old 11th November 2002, 10:32 PM   #23
JensRasmussen is offline JensRasmussen  Denmark
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Default Base resistor

Quote:
Originally posted by halojoy

The resistor 15 ohm is used, when the current limiting transistors, T6/T7 gets active, to limit the current flow through the transistors.
Well, I thought that it destroys the Q (In a possible LC cuircuit) , making the thing not oscilate.

\Jens
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Old 11th November 2002, 10:41 PM   #24
halojoy is offline halojoy  Sweden
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Default Drafrance007

Quote:
Originally posted by JensRasmussen
Well, I thought that it destroys the Q (In a possible LC cuircuit) , making the thing not oscilate.
\Jens
This is the correct answer Drafrance007.
Jens Rasmussen knows this. He have studied these things.
He should know.

But to more mortal souls, like me and Drafrance007
the answer could be flying some bit over our heads.

A good teacher speaks same language as his pupils.
doesn't he?
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Old 12th November 2002, 08:51 PM   #25
Drafance007 is offline Drafance007
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Default Re: Drafrance007

Quote:
Originally posted by halojoy

This is the correct answer Drafrance007.
Jens Rasmussen knows this. He have studied these things.
He should know.

But to more mortal souls, like me and Drafrance007
the answer could be flying some bit over our heads.

A good teacher speaks same language as his pupils.
doesn't he?
O.K.I Can.t say i comlete understand this but it it's purpose was bothering me. One intresting stuf...why so many out transistors...i...polled out 200w with 4 transistors bd911/912, maybe 6...mje...OK...but WHY 8 transistors... ???
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Old 13th November 2002, 11:29 AM   #26
marcus66 is offline marcus66
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Hello again,

I see that some questions have appeared here,
and thay have already been answered by others!
Thanks for your interest!
Regarding the 8 output devices: yes, this number
may seem exaggerated. The amp will probably work
well with 6 or even 4 transistors, especially
for an 8 ohm speaker.
My intention when using 8 transistors
was to make the amplifier rugged. The maximum
power that the transistors can handle decreases
with increasing temperature. The 8 transistor
configuration is intended to allow for safe operation also when the amp is run hot.
Also, paralleling many output devices reduces
the effect of 'beta-droop' as described
e.g in Douglas Self's book.

Best wishes to all of you!

Marcus



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Old 14th November 2002, 12:05 AM   #27
Drafance007 is offline Drafance007
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Now, Just one more question.....if you pull-out the short-circuit protection....could the amp give twice as much power on a 2 OHM load....wit a beter power supply ???
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Old 14th November 2002, 12:20 AM   #28
halojoy is offline halojoy  Sweden
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Quote:
Originally posted by Drafance007
Now, Just one more question.....if you pull-out the short-circuit protection....could the amp give twice as much power on a 2 OHM load....wit a beter power supply ???
why would you need twice as much
if there is already much

Are you gready (want more and more and more, never satisfied)
or are you an
poweroholic (an power addict)
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Old 14th November 2002, 08:15 PM   #29
Dragance007 is offline Dragance007  Yugoslavia
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Quote:
Originally posted by halojoy

why would you need twice as much
if there is already much

Are you gready (want more and more and more, never satisfied)
or are you an
poweroholic (an power addict)
No, No, I Am Just a guy that likes to buid amplifiers but there are may "SO(SELF) CALLED" DJ's around me and diskoteks that ask me for that much power so i wanted to know since i don't have proper tanformer is it Posible ????
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Old 15th November 2002, 09:05 AM   #30
hugobross is offline hugobross  Europe
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Quote:
Originally posted by Dragance007

there are may "SO(SELF) CALLED" DJ's around me and diskoteks that ask me for that much power so i wanted to know since i don't have proper tanformer is it Posible ????
Hehehe, I know those guys !!!
just for fun:

Just let them hear a good 100/200W amp with good speakers (with high sensitivity) and play at almost full power (the whole room is thrilling) and ask them 'how many watts' they think that's playing. They would be amazed that it's 'only' a 100 or 200W.

HB.
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