Patent #4,107,619 - Page 2

Nelson Pass · 16th August 2005, 08:42 PM

Quote:

Originally posted by Cobra2
United States Patent 6,255,907

That seems to be the patent # for an air filtration device.

Cobra2 · 16th August 2005, 09:04 PM

try this...:
http://patft.uspto.gov/netacgi/nph-P...S=PN/6,255,907

Arne K

(don't know if it's the right patent, but I've been told that it is held by DP...)

Nelson Pass · 16th August 2005, 09:15 PM

Ah, there it is. I see that they did not reference Sano's
patent, which may explain a lot.

lumanauw · 17th August 2005, 01:30 AM

For me (I'm not too fluent with English), the "Dynamic Precission" patent is 95% the same with Hafler's Transnova patent. It uses complete low voltage amp to drive grounded emitor output stages that modulates the floating supplies and the output is taken from the CT of the floating supply.

The feedforward/Error correction in Transnova patent is implemented as R (Ikorr) in this patent.

Nelson Pass · 17th August 2005, 02:03 AM

I might be wrong, but I haven't seen the schematic and I am
guided by the quote "They use a class-B amplifier to drive the
ground of a floating power supply that is used for a +/- 15V
class-A amplifier"

I don't think that this describes the Transnova (a nice circuit
in its own right) because it describes two amplifier stages,
a large one driving the supply of a small one. The only topology
I know that fits is Sano et al, which was made by Panasonic.

You might be amused to know that Sano's patent inspired me to
reverse the roles of current and voltage and write patent
#5,343,166

lumanauw · 17th August 2005, 09:29 AM

Hi, Mr. Pass,

Yes, you are right. If only follows the quote (without reading the patent itself) the quote will be similiar to Sano's patent.

But after I read the schematic in Dynamic Precission patent, I think it is more similiar to the Transnova more than to Sano's.

BTW, what happened to your patent #5,343,166? You said you "wanted to save it for the old days".

I always amazed by what you built/draw. When will you make something with this patent #5,343,166? From 7 patents of yours, (from the power amp categories) I think this one have the least implementation.

Nelson Pass · 17th August 2005, 08:08 PM

I have never had occasion to put it in a product.

angel · 19th August 2005, 04:26 PM

The description of the circuit is accurate. I read a reverse-engineering bit on the product based on it somewhere.

The damn thing (DP A1) has more parts than a high-end class D amplifier, oddly enough, more transformers and capacitors than you'd expect if it were pure class A (2x800W @ 4ohm), and a very nice sound. Who says opamps have no place in high-end circuits?

16th August 2005, 09:04 PM	#12
Cobra2 DIY ! diyAudio Member Join Date: Apr 2002 Location: Stavanger, Norway	...the air we breathe... try this...: http://patft.uspto.gov/netacgi/nph-P...S=PN/6,255,907 Arne K (don't know if it's the right patent, but I've been told that it is held by DP...) __________________ Ars longa, vita brevis

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16th August 2005, 09:15 PM	#13
Nelson Pass The one and only Join Date: Mar 2001	Ah, there it is. I see that they did not reference Sano's patent, which may explain a lot.

17th August 2005, 01:30 AM	#14
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	For me (I'm not too fluent with English), the "Dynamic Precission" patent is 95% the same with Hafler's Transnova patent. It uses complete low voltage amp to drive grounded emitor output stages that modulates the floating supplies and the output is taken from the CT of the floating supply. The feedforward/Error correction in Transnova patent is implemented as R (Ikorr) in this patent.

17th August 2005, 02:03 AM	#15
Nelson Pass The one and only Join Date: Mar 2001	I might be wrong, but I haven't seen the schematic and I am guided by the quote "They use a class-B amplifier to drive the ground of a floating power supply that is used for a +/- 15V class-A amplifier" I don't think that this describes the Transnova (a nice circuit in its own right) because it describes two amplifier stages, a large one driving the supply of a small one. The only topology I know that fits is Sano et al, which was made by Panasonic. You might be amused to know that Sano's patent inspired me to reverse the roles of current and voltage and write patent #5,343,166

17th August 2005, 09:29 AM	#16
lumanauw diyAudio Moderator Emeritus Join Date: Oct 2002 Location: Bandung	Hi, Mr. Pass, Yes, you are right. If only follows the quote (without reading the patent itself) the quote will be similiar to Sano's patent. But after I read the schematic in Dynamic Precission patent, I think it is more similiar to the Transnova more than to Sano's. BTW, what happened to your patent #5,343,166? You said you "wanted to save it for the old days". I always amazed by what you built/draw. When will you make something with this patent #5,343,166? From 7 patents of yours, (from the power amp categories) I think this one have the least implementation.

17th August 2005, 08:08 PM	#17
Nelson Pass The one and only Join Date: Mar 2001	I have never had occasion to put it in a product.

19th August 2005, 04:26 PM	#18
angel diyAudio Member Join Date: Oct 2003 Location: Norway	The description of the circuit is accurate. I read a reverse-engineering bit on the product based on it somewhere. The damn thing (DP A1) has more parts than a high-end class D amplifier, oddly enough, more transformers and capacitors than you'd expect if it were pure class A (2x800W @ 4ohm), and a very nice sound. Who says opamps have no place in high-end circuits?

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