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Old 7th September 2011, 08:43 AM   #1
mome is offline mome  Thailand
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Default class a audio amplifier 5w with ic ne5532

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Among the final amplifier we called. Regional Power Amp, will it work on several well-known as Class A, Class B, Class AB etc. Each class of the above, to honor the Class A was superior to the sound quality. best. However, class A power output to a low of 20 percent compared with a loss of power or the power consumption of about 5 times the power output. Therefore, the problem of heat Although it has not paid any audio. But anyway, despite the low-watt power, it also provides crystal clear sound quality than Class B and Class AB................Read more
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Old 7th September 2011, 10:25 AM   #2
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Hmmm...

Wheres the valves...?
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Old 7th September 2011, 10:37 AM   #3
Doz is offline Doz  United Kingdom
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Quote:
Originally Posted by Alastair E View Post
Hmmm...

Wheres the valves...?
Perhaps they're in the power supply
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Old 7th September 2011, 11:49 AM   #4
DF96 is offline DF96  England
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Strange circuit, seems designed to introduce distortion then remove it again with massive negative feedback. Why drive the output Darlingtons from a significant resistance? Why amplify the op-amp DC offset to the output? Looks like a good example of how not to do an augmented op-amp.

And, as others have said: where are the valves?
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Old 7th September 2011, 02:13 PM   #5
teemuk is offline teemuk  Finland
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Ah, a ripoff of the old Elektor Class A+B amp, right down to original errors in the schematic.

So that you know: The most important and ingenious half of this design is missing though; effectively turning a rather good high efficiency and high power class-A amp into a mediocre low efficiency and low power class-A amp.

Folks, try if Google search finds the original Elektor circuit from the mid 1980's. It's much more worthwhile.

Quote:
Why drive the output Darlingtons from a significant resistance? Why amplify the op-amp DC offset to the output? Looks like a good example of how not to do an augmented op-amp.
As said, seeing the original design and correcting the most blatant errors (e.g. the opamp should be direct coupled and the coupling caps should really be bootstrap caps) will explain a lot of stuff and also enlighten why that circuit is, for example, featuring too separate power supplies for no obvious reason.

Yes. This thread is indeed in the wrong forum section.

Last edited by teemuk; 7th September 2011 at 02:20 PM.
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Old 7th September 2011, 02:55 PM   #6
teemuk is offline teemuk  Finland
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Oh... To add, the original design easily generated the rated 5 watts, infact, it's rated power was about 15W with a rather decent ~50% efficiency.

This ripoff design on the other hand is incapable of producing no more than about 1.8W of power with efficiency of about ~25%.
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