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Old 21st February 2011, 09:25 AM   #31
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Quote:
Originally Posted by prorms View Post
who has the best schematic to build a 100w to 1000w
iam just wondering wich is the best power amp to build???
perhaps there:
It's cheap, it's N, it's dirty, it's.... The CIRCLOMOS!!!
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Old 22nd February 2011, 12:45 AM   #32
ontoaba is offline ontoaba  Indonesia
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Hi tief, I am sure you have many schematics on your hands, some of them is your own. Umm, ii circlomos? any reasons? may be useful.
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Old 22nd February 2011, 08:10 AM   #33
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Originally Posted by ontoaba View Post
Hi tief, I am sure you have many schematics on your hands, some of them is your own. Umm, ii circlomos? any reasons? may be useful.
The main reason is the fact, that I hate so called "true complementary" topologies, both by the use of BjT or MOSFET output power devices. Unfortunately the most commercial topologies work so.
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Old 22nd February 2011, 12:15 PM   #34
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Originally Posted by tiefbassuebertr View Post
The main reason is the fact, that I hate so called "true complementary" topologies
Any (logical) reason?
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Old 22nd February 2011, 01:58 PM   #35
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Originally Posted by Jay View Post
Any (logical) reason?
Yes. please read post #83 about
2N3055 inside - commercial famous amplifier models, quasi complementary power output
and post #1 about
URL Collection of Commercial Single Ended Integrated and Power Amplifier Devices
push pull topologies without so called "true complementary" output power stages you will find about this URL collection:
URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage

Last edited by tiefbassuebertr; 22nd February 2011 at 02:06 PM.
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Old 22nd February 2011, 03:43 PM   #36
Jay is offline Jay  Indonesia
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Quote:
Originally Posted by tiefbassuebertr View Post
Yes. please read post #83 about
2N3055 inside - commercial famous amplifier models, quasi complementary power output
and post #1 about
URL Collection of Commercial Single Ended Integrated and Power Amplifier Devices
push pull topologies without so called "true complementary" output power stages you will find about this URL collection:
URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage
Hi Tief, are you saying that you hate class-B amplifiers?

Thanks for the post#83. The Altec 1590 topology is very similar to my PA/ceiling amps. I'm searching for the best possible modification for the amplifiers and the Altec is perfect if the sound quality is as good as being said.

I see that the circuit is single ended with little bias. But to force linearity it uses rough bias/feedback. Resistor divider networks, too many capacitors in the signal path (to block DC). The result is a highly distorted/noisy amp. The spec says below 1% (which is big). You may say that THD doesn't say much but I'm sure it is audible in this amp (like in mine). My amps are capable of 40Hz, the Altecs are specified 45Hz. I don't think the Altec is high-end, but I hope it is!
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Old 22nd February 2011, 03:59 PM   #37
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Originally Posted by Jay View Post
Hi Tief, are you saying that you hate class-B amplifiers?
No, not in general. The disadvantage is harsh sound in high frequency aera above approxximately 5 KHz. But the advantage is a clear and tight bass transmission. For Tweeters pure class a (at best single ended) is the royal way.

Quote:
Originally Posted by Jay View Post
Hi Tief,

Thanks for the post#83. The Altec 1590 topology is very similar to my PA/ceiling amps. I'm searching for the best possible modification for the amplifiers and the Altec is perfect if the sound quality is as good as being said.
I see that the circuit is single ended with little bias. But to force linearity it uses rough bias/feedback. Resistor divider networks, too many capacitors in the signal path (to block DC). The result is a highly distorted/noisy amp. The spec says below 1% (which is big). You may say that THD doesn't say much but I'm sure it is audible in this amp (like in mine). My amps are capable of 40Hz, the Altecs are specified 45Hz. I don't think the Altec is high-end, but I hope it is!
I haven't heard and investigate the Altec 1590. This means, that it may be quite, that it's sound is very bad through certainly (me unknown) design errors resp. through unwanted parasitic effects.
Please note: If you have found the best possible circuit topology, you don't have automaticly the best sounded amplifier.
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Old 22nd February 2011, 06:03 PM   #38
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I have just followed some links regarding the Altec amp. It is indeed a low-end amp

Quote:
Originally Posted by tiefbassuebertr View Post
The disadvantage is harsh sound in high frequency aera above approxximately 5 KHz. But the advantage is a clear and tight bass transmission. For Tweeters pure class a (at best single ended) is the royal way.
I guess the crossover effect in class-B will be minimized if the voltage transformation is kept low, hence current-driven. Using lateral mosfet and a properly designed speaker (using ultra high frequency tweeter such as the dynaudio) I don't think I have ever needed more in the treble region. The speaker affects the treble more than the amp (speaking of hi-end amps) anyway.

Speaking of the best schematic, I wonder why nobody interested to improve the performance of the Mooly's amplifier. Searching for the most suitable transistors, increasing the slew rate (higher rail, regulated front end), removing the feedback cap, improving linearity, improving power etc.

The key to my amplifier implementations is the choice of the transistors!
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Old 22nd February 2011, 09:40 PM   #39
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Quote:
Originally Posted by Jay View Post
I have just followed some links regarding the Altec amp. It is indeed a low-end amp
...only before tweaking.

If you don't like multi-amping systems (i. e. individual circuit topologies for each speaker frequency aera, by three way this means an amp for bass, midrange and high frequency aera - actually the royal way), and you want to have only one big amp for all the aeras at your speakers, I would say, the circlotron (CSPP=Cross Shunt Push Pull) / PPP=Parallel Push Pull) is the best of all topologies.
Check out the URLs by
URL collection of Totem Pole and CSPP (Single Ended related) Solid State Output Stage
and there:
CSPP/Cirlotron - Brand Names of Commercial Solid State Amplifiers

Last edited by tiefbassuebertr; 22nd February 2011 at 09:49 PM.
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Old 23rd February 2011, 01:24 PM   #40
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Hi, tief. Thanks, thats interesting links.

There are other reason to get 100W-1000W. Circlomos Isn't classB, and only +/-35V. The difficult things in 100W and up are many things, like thermal, efficiency, component limitations, then how to prevent classB from creating noises when there is any current back from loudspeaker, manage the damper, failure protections, and some more.
Speed and matching devices is not everything (sometimes not needed), single ended classA facing just a current source, and loudspeaker itself is very different between front and back.
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