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Old 25th May 2004, 05:32 PM   #11
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Default Complexity

For an amp that only runs on a +/-32V supply it is incredibly complex. You can do with mayby 1/2 the parts for the same result. Look up some other good designs.
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Old 25th May 2004, 07:01 PM   #12
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You think that's complicated, you haven't seen the Madrigal
(Levinson) ML-333 and its brothers. Last time I counted, there
were nine gain stages.
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Old 25th May 2004, 08:08 PM   #13
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Default Hi Nelson

I was at an EMC seminar in Irvine, CA last week. I met a fellow that works fwith you. Nice fellow though for the life of me I cannot remember his name.

Dan
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Old 25th May 2004, 10:15 PM   #14
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That would be Wayne.
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Old 26th May 2004, 02:23 AM   #15
Rarkov is offline Rarkov  England
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Looks alot like a Randy Slone (Seal Electronics) design to me...

High Power Audio Amplifier Construction Manual...It looks like a concatination of two designs.

In that case - they sound fantastic! I built the design that he calls "OptiMOS" however, I ran it slightly higher - to make 200W. They are the nicest I've had in my system so far.

Gaz
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Old 26th May 2004, 03:04 AM   #16
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Nelson,

Was that a Kimmel-Gurke EMI seminar? I used to sponsor them here on Long Island. I sell for Tektronix, at least for the next 3 days, then on to another test and measurement manufacturer. If it was a Kimmel-Gurke seminar they also have a neet signal integrity seminar.
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Old 26th May 2004, 05:38 PM   #17
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Default Re: Very complicated amp

Konnichiwa,

Quote:
Originally posted by HM666
What do you think abou this amp(schematic is aded as attachment)? Sory for image quality.
This about as straightforward, broingly conventional and orthodox as it gets.

Loads of ring of two current sources and discrete darlington / follower buffered stages and the compund feedback pair output stage with large numbers of parallel transistors add up to a very high component count, but in the end it is a classic Amp, Long tailed Pair to Voltage Amp to Emitterfollower Output, basically the type of topology talked to death by D. Self and easly outperformed by superior designs that eshew the usual brainless design approach.

It arguably is more or less a consequent implementation of D.Self's "blameless" amplifier, but jut because the Amplifier is "blameless" it does not mean it is "good".

Look at some of the Jean Hiraga designed circuit and their descendants for something a little simpler and better performance.

Sayonara
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Old 26th May 2004, 09:46 PM   #18
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Quote:
Originally posted by kilowattski
Was that a Kimmel-Gurke EMI seminar?
It was put on by Compatible Electronics.
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Old 27th May 2004, 04:33 AM   #19
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Hi Carlos,

One concern I have is with the protection circuitry. The design of the protection circuits makes the current limit constant regardless of output voltage. So if the designer makes the current limit small enough to prevent damage with a short circuit on the output, it will limit the amount of power that can be delivered into low-impedance loads (say, 4 Ohms) in an undesirable way. A better design makes the current limit depend on the output voltage, allowing the amp to deliver more current when its output is close to the voltage rail than when its output is near zero Volts This requires adding two resistors. They connect to the current limiting transistors (the ones with the diodes in their collectors). One resistor connects from the positive supply voltage to the base of the NPN current limiting transistor, and the other connects from the negative supply voltage to the base of the PNP current limiting transistor. This simple change allows the amp to put out more current the closer the output voltage is to the rail. It does require re-calculating the reisitor values though. I have an article on this I could send you if you wish. Just drop me an email if you'd like it.
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Old 28th May 2004, 03:35 AM   #20
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Default If this Carlos is me...

I think it is not to me, but no problem, i normally read all forum and all threads... so, when someone writes something... it is to me too.

Thank you Andy to say my name.

Carlos
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