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Old 6th August 2005, 05:01 AM   #1
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Default Patent #4,107,619

NP's Patent #4,107,619 is said to be "Statis" patent. A good-small amp is driving output loudspeaker with the help of bigger amp to give the current to the load.

Which Statis or Threshold amp schematic uses this Patent? The ones that can be found in this forum seems none incorporating this patent.

Is it the same principle as Current Dumping power amps (Quad, maybe) ?
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Old 6th August 2005, 06:49 PM   #2
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I don't understand the fig.2 in this patent.

I redraw this fig.2, and it seems device 59 is forming "Howland Current Pump" with Vc at R7 as the input.

But I'm confused. In my thinking, R4 should be connected to VC (not to ground) and R6 should be connected to ground (not to VC).

The logic is if Vc is positive towards ground, then the device 59 should be giving current, not sucking current. Am I wrong here?
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File Type: pdf bns2.pdf (9.2 KB, 519 views)
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Old 7th August 2005, 01:28 AM   #3
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There were only a few amplifiers built that actually corresponded
to the diagrams as shown in the patent. They worked well, but
were simply too complicated. A much simplified series was
introduced as the Stasis 1, 2, and 3. There, a single
complementary pair of followers was connected to the output
stage, but drove current gain off their Collectors "Sziklai" fashion,
and the whole thing was cascoded, so that the followers
experienced near constant current and voltage.
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Old 7th August 2005, 02:09 AM   #4
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Quote:
A much simplified series was introduced as the Stasis 1, 2, and 3.
Why is that I'm not surprised by this. A Nelson Pass can get the same result with much more simpler and elegant way

This schematic is made By Mauropenasa. In this schematic, R6 is the sensing resistor, and the more positive side of the sensing resistor is connected to (+) input of U1.

In the statis patent, R7 is the sensing resistor, and the more positive end of this resistor is is connected to (-) of device 59.

These 2 has opposite operation of the current pump, one gives current for positive sensed voltage, one sucks current for positive sensed voltage?

Which one is the right one?
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File Type: pdf maurogainclonestatis.pdf (16.8 KB, 297 views)
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Old 7th August 2005, 04:05 AM   #5
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Hmmmmm...

From a cursory look, I don't think it's the same, but I'll think
about it when I get back from vacation.

/pass/: has been at the beach for a week, and not thinking
too deeply.
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Old 7th August 2005, 04:10 AM   #6
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Hi Mr. Pass,

You are accessing this forum from a beach / On vacation.
Beaches and smart brains are compatible.

I would appreciate your answers more this way
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Old 7th August 2005, 04:31 AM   #7
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How to use this schematic?

The (-)input of opamp block is to be (-)input of the current pump.
The (+)input of the opamp block is to be (+)input of the current pump.

IF the (+)input is more positive than (-)input, then the output is giving current or sucking current?
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File Type: jpg howland.jpg (74.1 KB, 805 views)
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Old 16th August 2005, 08:37 AM   #8
angel is offline angel  Norway
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At risk of threadjacking, I would mention that similar benefits have been achieved by means of another patent by Dynamic Precision.

They use a class-B amplifier to drive the ground of a floating power supply that is used for a +/- 15V class-A amplifier. Effective result is 400W or so with class A sound and drive.

Somewhat simpler to do as well.
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Old 16th August 2005, 10:30 AM   #9
Cobra2 is offline Cobra2  Norway
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Default Dynamic Precision patent...

Off topic...: I think it's :
United States Patent 6,255,907
(international publication no # WO 98/05119)

Arne K
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Don't believe everything you think...
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Old 16th August 2005, 08:38 PM   #10
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Quote:
Originally posted by angel
They use a class-B amplifier to drive the ground of a floating power supply that is used for a +/- 15V class-A amplifier. Effective result is 400W or so with class A sound and drive.
That would be the 1977 patent from Sano et al, #4,115,739
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