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Old 7th March 2005, 09:28 PM   #91
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originally posted by carlosfm
Quote:
You will never get it, even if I stick it on your nose.
LOL, well, forgive me my ignorance and say what that "much more" is. Most of the people on this website know the interrelationships of the components but I think it is a great disservice to espouse the idea that the power supply should be anything other than quick, quiet and stiff to a person who is just trying to get his amp to work. If we are talking about putting things in the power supply to compensate for attributes in an op-amp that is one thing but to describe it as "part of the signal" IS obfuscation.
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Old 7th March 2005, 09:50 PM   #92
PauSim is offline PauSim  Portugal
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Quote:
AAA or AA batteries?
Oops. A- on that


Quote:
from Stereophile:

"As you might expect, the Music-6 requires a bit more in the way of juice; its companion power supply, the Final Laboratory DC-6, is actually a pair of battery boxes, each housing a series-connected bank of 18 D cells, for a total of ą27V"

18x1.5=27
Even I knew that one . Perhaps my post wasnīt clear. What I would like to know is: what chip accepts 27V and gives out only 10 Watts? If each bank consisted of two paralel groups of 9 cells ( 9*1.5=13.5) would be closer to lm1875 or similar specs. But then J Atkinson measured 16 or 17 Watts and thatīs what puzzles me. Tda2006 ?

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Old 8th March 2005, 02:28 PM   #93
protos is offline protos  Greece
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Quote:
Originally posted by janneman



Yeah, it's a cheap trick. Just pretend that audio designers only measure with 8 ohms resistors. I've never met a serious designer doing this, but it is always quoted by those who know diddly of designing a simple piece of electronics in the first place.
Like saying that engineers listen with their meters or scope. It isn't true of course, but what's a little lie if it matches the self-delusional outlook of the would-be know-alls?

Jan Didden

Hey , letīs not get carried away here.I was referring to previous postings on this thread detailing measurements on power supplies.I NEVER said audio designers IN GENERAL only use simplistic measurement techniques.
Actually the point I wanted to make was that WE SHOULD measure these battery or AC ps under more complex dynamic conditions such as when an amp is driving a real speaker load.
ONLY THEN can start a serious discussion of which MIGHT sound better based on empirical scientific evidence.
AFTER measuring the various PSīs we could also , if we want and have the patience, measure various characteristics of the amplifier with the various PSīs connected to confirm that indeed the amp is performing better with a particular power supply.

HOWEVER, my impression is that at the end of the day most members here would choose the PS that sounds best to them.
Experience has shown that this MAY NOT ALWAYS be the best measuring one although it is more probable that it will be the preferred PS.

OK , letīs see how many disagree with that.
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Old 15th March 2005, 12:55 PM   #94
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Default stupid noob question

How do I wire my 4 12V batteries to get a positive and negative rails with ground on each? Does anyone have a simple schematic? I would like to test a battery PS with my BrianGT LM4780 boards, but I can't find an example of how the PS circuit would look. Sorry if this is answered somewhere, I could not find it.
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Old 15th March 2005, 01:14 PM   #95
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Ground on each i dont really get.

If you desire +/- 24 VDC you connect all batteries in series,
plus(+)of one battery connects to minus(-) of the next battery.
The common ground in the middle:

= +12- +12- +12- +12-
= +24Vdc___0___ -24 Vdc

For double +/- 12 Vdc the same but with 2 batteries:

= +12 - +12-
= +12Vdc__ 0__ -12Vdc
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Old 15th March 2005, 01:18 PM   #96
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Quote:
If you desire +/- 24 VDC you connect all batteries in series,
plus(+)of one battery connects to minus(-) of the next battery.
The common ground in the middle:

= +12- +12- +12- +12-
= +24Vdc___0___ -24 Vdc
Thanks Jacco, that is exactly what I was looking for. In the case of Brians board there is a +g and -g pad, and I thought perhaps I had to treat these specially. Should I simply use the same ground for both?
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Old 15th March 2005, 01:27 PM   #97
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Default fuse and switch

Would it wise to place the switch and a fuse in the center at the same point (in series with batteries) where I get my 0V? Or is there some better way to wire up a switch for DC/battery power supply.
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