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Old 26th April 2002, 08:11 PM   #1
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Default ( stupid ? ) idea to reduce power consumption

Hi,

what exactly happens, if the idle current is reduced to 1/10th of normal ?

My idea is to couple the volume pot with another one, that regulates the idle current.

Low volume - low current, high volume - full current.

Does the sound quality suffer, or is it possible to do that ?


Bernhard
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Old 26th April 2002, 09:05 PM   #2
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It can be done, but the sound quality will change as the bias goes up and down. Depending on the design of the circuit, the amp may become unstable as the operating points change with the change in bias.

Grey
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Old 26th April 2002, 09:30 PM   #3
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I would like to do that with 8 channels of Aleph5.

May be with 10 different bias levels.
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Old 26th April 2002, 09:41 PM   #4
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I think it's a good idea. I've seen some project in the gallery that had the adjustable bias option. And of course, you can always adjust bias to your taste.
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Old 26th April 2002, 10:58 PM   #5
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I also think it is a nice idea. Sometimes the simples ideas are the nicest. I know that one of Andera Cioffulie's (?) amp has a Iq setting switch and my own amp has a Iq pot for adjustment .. why not couple such a pot or switch to your volume pot ..

I might bne that High Iq serve high linearity of the output stage but you could verify your self ..

It might very well be that the absence of cross-over distortion is far mopre important than large signal super linearity. .. I actually think that is the case... so we should design a variable Iq class A amp this weekend!

greetings,
thijs
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Old 27th April 2002, 01:11 AM   #6
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I was afraid, that I have to downgrade the A5, because power consumption would be too high for 4-way active speakers.

4 times the consumption of a normal stereo setup...

1200VA all the time...

But now...

If that works, maybe it is possible to do that with relais, as I use them for my volume control.

Maybe 1/8, 1/4, 1/2 and full is ok.

Is it true that the Aleph, because of its circuitry will always run classA even on smallest idle current ?


Two resistors will set the current per channel ?


Can I use the IRFP450 or 460 also ?

They are very easy to get for me.

My heatsinks, they have space for 64 TO3 mosfets...

That is 8 mosfets per channel.

Click the image to open in full size.
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Old 27th April 2002, 02:12 AM   #7
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Default Musical Central Heating ?

Bernard,
With volume control variable bias, you could have volume controlled central heating - best sound during cold winter ?.

Regards, Eric.
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Old 27th April 2002, 02:52 PM   #8
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Bernhard,

Just curious, what are the 8 channels for?
Your chassis looks impressive.
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Old 27th April 2002, 02:55 PM   #9
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My speakers are 4-way active, so 8 Monoblocks is what I need.
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Old 27th April 2002, 03:09 PM   #10
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So, they pretty hungry on power, aren't they? At least you gonna keep them warm in winter.
Are they also impressive?
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