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Old 24th February 2010, 08:24 AM   #11
wahab is offline wahab  Algeria
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Indeed, class A amp are often power hogs.

I understand such designs at low powers, about 10 W rms is
a maximum for a push pull topology which is more efficient
than single ended siblings.

Besides, where is the quality of class A when one propose a single
ended design that yield 1 % distorsion (recently impoved to 0.25%)
at a power output of 1 W rms and with a TDP of 60W ?...

The extra consumed energy is not synonym of quality.
Seems people prefer amps that run hot, the style " hey , wait, it s
warm, i can hear it breathe, it s alive !!!"...........

Last edited by wahab; 24th February 2010 at 08:36 AM.
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Old 24th February 2010, 08:38 AM   #12
lazyfly is offline lazyfly  Australia
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People read the Aussie Hi-Fi magazines?

There are joust fool of tie-po's!
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Old 24th February 2010, 08:47 AM   #13
Luke is offline Luke  New Zealand
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Quote:
Originally Posted by AKSA View Post
I suspect this is wishful thinking on the part of the review writer. I've seen nothing on this anywhere.

I think also that laws should be introduced rationing hydrocarbon fuels (or their equivalents) for domestic households/vehicles of no more than 50 litres per week, including electricity, gas, and the energy content intrinsic in desalinated water.

Honestly, the use of energy by modern societies is clearly wrong, and should be immediately curtailed. Laws should be passed, with stiff penalties.....

This is frightfully important. There should be a G8 summit about this.

interesting idea, but I imagine our banker friends would rather we just paid for addditional carbon credits rather than limit them, or am I just being cynical
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Old 24th February 2010, 10:51 AM   #14
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Originally Posted by qusp View Post
Hi guys, I recently heard a rumor that class A electronics are going to be outlawed as anything that consumes full power while idle is to be discontinued. is there any truth to this? I mean it wouldnt surprise me the way things are going and until they start sending out inspectors I dont think us DIYers have much to worry about, plus of course a solution is to simply power down the unit when not in use.

but this could end in tears
If its true then it would probably only apply to mass manufacture.

Its the same for EMC and power factor rules, they dont apply to prototypes.
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Old 24th February 2010, 11:08 AM   #15
Luke352 is offline Luke352  Australia
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A very quick google search reveales

Products Being Considered for Regulation

E3 Committe Cost-Benefit Analysis: MEPS and Alternative Strategies for Home Entertainment Products

What's New

A draft proposal for: Minimum Energy Performance Standards for Home Entertainment Equipment

Standby Power

Electronic Library

Standby Power - Product Profiles

I'm not going to go through and point out all the particular areas of interest but in 15mins I'm sure you can see there is definite reason for concern.

But as stated earlier I doubt DIYers have any reason for concern, it's a bit hard to regulate DIYers.

Last edited by Luke352; 24th February 2010 at 11:15 AM.
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Old 24th February 2010, 12:16 PM   #16
qusp is offline qusp  Australia
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ok plenty of replies, sorry been out all day and this was started just before I went to bed at 7am. right yeah like I said i'm just seeing if anyone else had heard this rumour. like I said it really doesnt effect us in DIY unless they start to send inspectors around unannounced they are in fact trying to do away with things that sleep; things of all sorts not just amps but Tvs computers etc.

for instance I really dont know how much they would think of the latest dac build i'm working on, using 3 transformers, 4 regulated supplies and 8-9 shunt regs; all to power a set of highly efficient custom in ear monitors (JH13) with an impedance of 28 ohms. I will also be using it with powered studio monitors and some less efficient headphones, but I have a feeling it may be frowned upon. the whole discrete output stage will be running in class A. but when i'm not using it, it will be off, so hopefully there goes that anyway.

Last edited by qusp; 24th February 2010 at 12:24 PM.
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Old 24th February 2010, 12:27 PM   #17
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The only true thing that i have seen happening is power factor correction for smps. As of now half the power they suck cant be used or billed to the customer. In the uk i believe if it is an external smps or a 300watt+ internal smps it has to have power correction.


Also based on the standby (which i hate, ive seen tvs suck 40watts OFF at the shop) i think all diy is good and green. Really who as a diy that sits in standby mode?

Last edited by nightanole; 24th February 2010 at 12:30 PM.
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Old 24th February 2010, 12:39 PM   #18
qusp is offline qusp  Australia
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Originally Posted by nightanole View Post
The only true thing that i have seen happening is power factor correction for smps. As of now half the power they suck cant be used or billed to the customer. In the uk i believe if it is an external smps or a 300watt+ internal smps it has to have power correction.
interesting, i'm pretty ignorant when it comes to SMPS, so i'm not really savvy of what you mean. so the power is not used but it cannot be recycled into the grid??

Quote:
Also based on the standby (which i hate, ive seen tvs suck 40watts OFF at the shop) i think all diy is good and green. Really who as a diy that sits in standby mode?
yeah no way would I ever build a sleep function. I think its evil as nobody benefits at all.
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Old 24th February 2010, 01:19 PM   #19
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A very quick google search reveales
With all due respect, it would go a long way if anybody actually spent 2 seconds to READ this stuff so we can just avoid all the freak-out conspiracy theory FoxNews-style panic.
  1. First of all - open the links and check the dates... this stuff is all 2006-2007-2008. Old news. Way old news.
  2. More importantly and the bottom line: As others have pointed out this is ONLY aimed at power-sucking standby mode equipment bu11shi4. Not a bad idea at all really. That is NOT "class A draws power at no signal", but "unit draws power when consumer has unit 'switched off'". End. Of. Story.
  3. Even if it didn't also as pointed out this stuff virtually never applies to DIY anyway. aka I'm off to solder with lead. Weeee!
  4. Aside from standby the only other thing that might REALLY happen would be like more 'Energy Star' and nutritional labeling - aka consumer information & voluntary standard compliance rather than hard-regulation. Again not bad idea, and again, nothing to do with DIY. So your hipster booteek Class A tube amp would have some big "sucks lots of power not green!" label on it and nobody who would ever want to buy one would ever care (in fact they'd probably love it...)
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Old 24th February 2010, 03:28 PM   #20
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Originally Posted by qusp View Post
interesting, i'm pretty ignorant when it comes to SMPS, so i'm not really savvy of what you mean. so the power is not used but it cannot be recycled into the grid??



yeah no way would I ever build a sleep function. I think its evil as nobody benefits at all.

Power factor is the offset of current vs voltage in power supply due to either a inductive or capacitive load. Most smps have a power factor of 0.5. So they suck 1amp, but the generator has to supply 2amps, and they can only bill you for 1amp. The generator supplies volts-amps but they can only bill you for watts.

The other way to thing about it is a mug of beer:

The glass is how much VA your need to run your stuff
the beer is watts the power company can bill you for
the foam is how much extra VA the power company must give you for free to keep your glass full
The beer and foam cost the power company the same amount to produce
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