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Old 22nd January 2008, 09:05 PM   #1
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Default Beautiful power supply! Brian's Chipamp.com

I have the new chipamp.com power supply.

Its impressive.

Really, I just thought it was durable and elegant, with well-done thermals as a bonus.

Today, I just receive news that the layout has facilitation that allows greater tolerance in adjusting attached amplifiers to personal preferences on tonality, with cooler thermals for attached amplifiers as an additional bonus, no matter what amplifier you attach to it. Well!! I had no idea!

KUDOS!!! And, a big thank-you to chipamp.com for going the extra mile on the power supply!
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Old 22nd January 2008, 09:18 PM   #2
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Default Re: Beautiful power supply! Brian's Chipamp.com

Quote:
Originally posted by danielwritesbac
Today, I just receive news that the layout has facilitation that allows greater tolerance in adjusting attached amplifiers to personal preferences on tonality, with cooler thermals for attached amplifiers as an additional bonus, no matter what amplifier you attach to it. Well!! I had no idea!
Hi Daniel,

Can you post a translation into Australian?

regards
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Old 23rd January 2008, 12:50 AM   #3
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In Australian? Okay! "Gits ya computa chip off tha barbie!" Is that about right?

EDIT: Two different facilitations for less heat, and less heat *can* be used for . . .
Um, extra tolerances that are really fun to play with! Or, 5 channel amp. Or the original intent--probably so that you can use a wide variety of enclosures without so much thermals to worry with. I like having all of these options enhanced--really appreciate it!
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Old 23rd January 2008, 12:57 AM   #4
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Cool Re: Re: Beautiful power supply! Brian's Chipamp.com

Quote:
Originally posted by Greg Erskine


Hi Daniel,

Can you post a translation into Australian?

regards
Some of us would settle for a translational into Midwest USA English.
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Old 23rd January 2008, 01:01 AM   #5
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Ditto. "Thermals" doesn't translate well into Canuck. Up here, 90% of the time it refers to long underwear, and 10% of the time it refers to gliding. Word.
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Old 23rd January 2008, 02:13 AM   #6
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Ah Midwest USA? Okay. 2 things:

#1
In a comparison between a textbook power supply and chipamp.com power supply,
When running chipamp.com lm3886tf, and/or
When running K50 LM1875t, and/or
several in surround sound (rockin out man!)
The chipamp.com power supply ran the amplifiers at cooler temperature.
They were all cooler (thermals) on chipamp.com power.
I don't know why, but. . .

#2
And because. . . If you've used the earlier (older) model amplifier kits (that don't have this power supply), the large caps at point blank range to the chip can heat up NFB, give her PMS, she'll dump you and send her friend, Spike over to make ya wiz on the lectric fence!
(that was Midwest Translation)
Instead of whizzing on the electric fence. . .
So, now (newer models) putting the big caps on its own seperate power supply, is audiably beneficial--because it reduces heat at a spot on the amp, NFB (gain loop structure), which is one of the two tone controls of the amp chips.
*There's a whopping page of math about that topic.
**There are upgrade products at chipamp.com to convert the older kits to the new power.

In these two ways, 1 and 2 above, the chipamp.com power supply reduces heat at the amplifier chip.

Less heat in the gain circuit is a REALLY fun thing for an amplifier, and beyond the scope of this thank-you letter posting.

This IS a thank-you posting to chipamp.com. Out of respect I'm not going to mention how to exploit the product's extra-power-at-less-heat-advantage on THIS posting. That's over at the LM1875 thread (surround sound project uses both amps), and it is a work in progress, not quite right yet, so that's the reason that I sidestepped explaining exactly why I'm so grateful for the excellent power supply.

I can say that the elegant power supply is capable of powering "concert level" presentations in-home and at high fidelity. It facilitates this and more.

If you'd like to save a buck on the transformer, I can post a photo of how to connect a center tap transformer. Anyone want it?
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Old 23rd January 2008, 02:18 AM   #7
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Wow.
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Old 23rd January 2008, 02:20 AM   #8
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Assuming ALL other things are held equal (supply voltage, input, load, etc.) the value of the power supply caps should have NO effect on the power dissipation of the chip! That really sounds like you have an oscillation problem with the other power supply because the chip gets hotter with that than it does with the chipamp supply.

Daniel, the reason these guys are razzing you is because the terminology you're using is rather hard to understand! It's certainly not what most people use when talking about circuits. I whole-heartedly applaud your enthusiasm, but it might help to browse through some other posts in this forum or have a look at basic op amp theory before making wild assumptions/assertions. What you're investigating now has been covered many times and is certainly not new.
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Old 23rd January 2008, 02:50 AM   #9
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At certain values, the NFB is sensitive to power supply structure, and the power arrangement of the stereo kit that I received from chipamp.com. . . is a big step in the right direction, according to the really hairy math sent to me by AndrewT.

I certainly don't understand why the location of the capacitors is better offboard the amplifier, except for that document hinting that more NFB options work in that layout.

Of course it also provides good quality power in addition to that (above).

Specifically, I used the extra tolerance(s) for. . . more rocking down the house for me.

And, I'm grateful. I'm amazed that the power supply already included a feature that I really wanted. . . before I even knew about it.

Its not just elegant quality power--it also facilitated my adjusting the amplifier NFB for the tone and power that I desired. . . and helped me succeed in getting the tone and power, because of its quality power, sure. . . but also because of the power layout in the kit product. Thats two different ways it helped me. And, its elegant too.

Rarely does one purchase something that does much better than advertised.

THANKS AGAIN!!!
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Old 23rd January 2008, 05:42 AM   #10
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Quote:
Originally posted by BWRX
Daniel, the reason these guys are razzing you is because the terminology you're using is rather hard to understand! It's certainly not what most people use when talking about circuits. I whole-heartedly applaud your enthusiasm, but it might help to browse through some other posts in this forum or have a look at basic op amp theory before making wild assumptions/assertions. What you're investigating now has been covered many times and is certainly not new.
So, I tried to explain it by function in case there's cowboys building amplifiers. I've seen it!! Did you know that Liquid Nails glue works for thermal compound?
This funny thing happens from just sending out specs: "Use siliconized thermal compound."

Computer network engineers, like myself, are always believing that there's both an interrelation and the possibility of much more performance, awaiting, with just one little tweak.
I think that most computer guys are just like Tim Allen's character on the "Home Improvement" television show.

Anyway, in my case, that was one tweak too many. I didn't need both a double gain boost and greater voltage in combination with 4 ohm speakers. Oops! Too much.

Reading up on "basic op amp theory" has helped me a lot--basically bailed me out of trouble from using too much amplifier with too much load. Sounds great. Too hot!
There was a good band-aid in the op amp documents. Temporarily, I have installed 1 ohm Mills speaker resistors in series with the speaker output terminals, per the documents. What a nice surprise! The amp runs cool now.
It was good reading indeed.
I'll be getting some 8 ohm drivers soon.

And the cowboys? They're great! That midwestern thermal compound, Liquid Nails, can heatsink my Mills resistors.

Where is the power supply? Its in here (see picture) at higher fidelity and power than it ever had on its NEC transistors.
All of the features that you see controls for, are all fully functional.
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