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Old 27th June 2007, 11:41 AM   #21
ilimzn is offline ilimzn  Croatia
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Quote:
Originally posted by jacco vermeulen

2SK1529 no same series as 2SK1058!
Both have gate, drain and source in the horizontal plane...
Nice MOSFET pictures
Exactly right, 2SK1529 in fact is NOT a lateral MOSFET. It is a species of trench MOSFET, and like the purely lateral 1058, it has a low treshold voltage, but UNlike the 1058, it has a positive Id temperature co-efficient, similar to vertical MOSFETs.
If I have said it once, I said it a thousand times but again and again the toshibas are quoted as possible lateral replacements. In this instance the tempco will not make a big difference, but in a PP class A or Ab amp... smoke might come out. Yet this 'legend' just refuses to die.

It should be also noted that the first transistors on that nice page Jacco linked, are actually not MOSFETs at all, but the legendary VFETs, which are actually power JFETs, depletion mode devices.
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Old 27th June 2007, 03:07 PM   #22
lineup is offline lineup  Sweden
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Smile Nelson Pass thinks output caps electrolytics sound good! In PLH IRF244 amplifier.

Quote:
Originally posted by Nordic

Yep, Hugh, I also burried the "electrolytics on the output sounds bad" myth
with some simple mosfet hybrid heaphone amps...

I am yet to match that quality of SOUND in a loudspeaker driving amp...
Quote:
Originally posted by AKSA
Hi Lineup, Nordic,

Another advantage of these coupling caps is the opportunity afforded to hot bias the tweeter/midrange cap on the crossover. You can connect these drivers direct to the output rail at a potential around half Vcc, and thus get the benefit of better, more linear operation for the mid and high frequencies. This is a huge advantage. Then the electrolytic coupler has only bass duties; and a quality electrolytic, with a polarising voltage across it, is actually extremely good sonically.

Cheers, Hugh
Quote:
Originally posted by lineup


Yeah, hugh.
you added some more benefits to using output caps

.. and in fact most any sound system uses 'Output Caps'
.. the difference is that
they are normally not called 'output caps'

They are loudspeakers crossover input caps.
Especially for higher frequency speaker drivers.
To block unwanted frequencies, to enter wrong element, woofers/tweeters,
and to keep things as constant as possible, as seen from amplifier out

Big Caps are a very simple & REALLY GOOD solution, many times.
An easy alternative to complicated 'stired up' jumbo mumbo to try to keep DC-levels in control.

And after all this DC-Coupling-Phreak-Show, a real show off in Volt DC 0.001, millivolts,
they would use a Crossover full of capacitance... anyway
Thinking they are smart

Most of us are not afraid of using ouput caps
and build single rail clean & good and easy circuits.

But as there are a few not convinced
by what we are trying to tell, AKSA, Nordic & little me, lineup

I show you a perfect example of what another Master of Audio designs
has to say:

Nelson Pass said:
Quote:
..
- I grew tired of telling the readers
how wonderful it sounds.
So I decided not to do that anymore.
If you want to know, go build it.
..

See attachment for schematic
if you REALLY would like to Follow Master Nelson advice:

- Go Build It !
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File Type: png nelson_plh_parallell-irf244.png (15.5 KB, 3245 views)
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Old 8th January 2008, 02:29 PM   #23
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offtopic
@ lineup:
please, mail me...
widowmaker@mail.bg
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Old 12th April 2008, 06:55 AM   #24
lineup is offline lineup  Sweden
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Lightbulb Low FeedBack amplifier.

Quote:
Originally posted by widowmaker
offtopic
@ lineup:
please, mail me...
Okay.
I try to see what you want to say to me, Daniel.

Many regards to all bulgarian audio amp friends

lineup -> still going strong & a bit more wise ..day by day (hopefully )



========================
PS. Attachment is some thing for audio designers to try!!!
Low Feedback Amplifer.
Gain & feedback level is set by: R3-R6
Input stage is an original idea of mine ( Lineup Audio LAB )
Also this is some thing you can try.
I am proud of this ONE. Very!
As anyone who understands Amps .. will know! DS.
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Old 12th April 2008, 05:38 PM   #25
CBS240 is offline CBS240  United States
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Quote:
It should be also noted that the first transistors on that nice page Jacco linked, are actually not MOSFETs at all, but the legendary VFETs, which are actually power JFETs, depletion mode devices.

MMmmmmm VFET Power J-fets. It's too bad good semi manufacturers don't realize the potential demand for these obsolete by supply, but not by design, components. I dream of an amp with about a dozen or so pairs.

I have no doubt they would sell
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Old 13th April 2008, 12:33 PM   #26
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Who doesn't, it will likely take me a few years more to collect sufficient numbers with an identical rating number.
Or, ask Spectral where they had their plastic V-FETs made.

High time to tease Bogdan again, here's ~3500 in different values, can't squeeze more coffee tins in a low bit size dig. pic.
Average wholesale cost in the early '90s when they were still available $4/pc for a 56nF to $5.5/pc for 100pF.
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Old 13th April 2008, 12:52 PM   #27
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Quote:
Originally posted by jacco vermeulen
Who doesn't, it will likely take me a few years more to collect sufficient numbers with an identical rating number.
Or, ask Spectral where they had their plastic V-FETs made.

High time to tease Bogdan again, here's ~3500 in different values, can't squeeze more coffee tins in a low bit size dig. pic.
Average wholesale cost in the early '90s when they were still available $4/pc for a 56nF to $5.5/pc for 100pF.

Jacco STOP IT!

What`s your wife saying about all that electronic parts investments??
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Old 13th April 2008, 09:50 PM   #28
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Not the parts, but the storage issues that hit her nerves.
(it must be my charming personality she likes)
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Old 14th April 2008, 12:43 AM   #29
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Going back to the schematics, I see a strange thing:
It uses a TL431 Constant Volt Supply followed by a D'Arlington pair to provide s very low impedance source, and then follows it with 4,7 K Ohms and looses all the regulation? And then trusts all the current regulation of the output stage in the Vbe voltage of a BD 639, with its poor thermal coefficient?
Something strange, not to say wrong.
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Old 7th September 2008, 10:02 AM   #30
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Default hi lateral single ended design

hi..i had a quick look at threads.. i wanna build this amp with lateral mosfets..2sk1058 or more powerful laterals.. which resistors should i change ? i want to use irfp150n for current source and 2sk1058 or more powerful laterals..

i am choosing laterals because they have smoother sound..

if you have powerful (more than 10watts )single ended lateral mos amp design please post..thanks
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