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Old 19th November 2008, 01:04 PM   #611
Bonsai is offline Bonsai  Taiwan
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For this reason exactly i said "this thread is the most enjoyable from any other in diyaudio forum".
Here, does not exists any circuit drawing on paper, any theoretical spice model, any circuit analysis, things that cause endless and tiring discussions and debates about this and that.
Here it exists only the work and the craftsmanship of each member, in pictures.
Here, the higher or lower quality of each project presented does not matters; the only that counts is the effort of each member to make his dream REAL.
For this reason this thread presented by far, more pure, more polite from any other in all forums.
Here, there is not any criticism or any attack from a member to other.
Here, there are only congratulations, compliments and gratitudes between the members for the exchange of informations about parts and technics, about ideas taken from the pictures and so on.
Here, i feel always like a child in a toy store.
I like to see everything pretty or ugly project!
BRAVO TO ALL!

Fotios




Fotios, I agree with you 100%

no b.s. - just good DIY
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Old 19th November 2008, 01:06 PM   #612
Bonsai is offline Bonsai  Taiwan
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will soon order some components
and build like this headphone amplifier, mosfet.

My simulations are very good!
I am trimming right now for the perfect Fourier analys.
The 5th order is not 100% gone. But I trying to minimize it.
More to come!

Many Regards Lineup



This looks good lineup - I hope you will share your fundings with us.
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Old 19th November 2008, 03:55 PM   #613
lineup is offline lineup  Sweden
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and i thought i should get some usual critics
for only telling about my spice sims
aa I post another guys amplifier, which is actually built
which i normally never do myself; build

i wish i had pratical workshop possibilities + lots of money
to actually try my many interesting designs
.. because I know, and my spice knows that they are hi-fi
.. but for now i can not do much more, than offer my good circuits for other to enjoy
.. or to be dissappointed at
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Old 19th November 2008, 11:25 PM   #614
reiver is offline reiver  United States
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Default My first project amp photos......

For everyone’s perusal here’s my new Hafler XL280 clone monoblock. With specs of 145watts continuous, mosfet outputs and a tested design I decided this was the best way to make a robust center channel amp.

The case is a gutted Dayton APA150, the only thing I kept were the binding posts and shell. I cut down the stock heat sink for space reasons and drilled holes for the mosfets. Transformer is a 110v/63vdc Hafler unit, the board is a Musical Concepts PA3D. Caps are Mallory 12,000mf/75v with a 600v 25a Vishay bridge rectifier. Three Exicon EC10N20 and three EC10P20 mosfets were used.

It powered up perfectly, no smoke or hum, sound is dynamic and articulate. The only problem is the heatsink is really too small to run the mosfets at 100ma each which is the stock setting (330ma). The stock chassis had a 12vdc 80mm case fan on the rear (behind the heatsink) so I just put a new ultra-quiet fan in that spot. This lets me turned the bias up to about 80% of optimum and the heat is ok.

Not sure if I'm posting a photo correctly, so my link is HERE

Thanks everyone for your Exicon tips on my earlier thread.

-Bryan
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Old 20th November 2008, 01:16 AM   #615
lineup is offline lineup  Sweden
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Three pairs of Exicon EC10N20 + EC10P20 MOSFET per channel were used
---------
Exicon EC10N20 + EC10P20 MOSFET are some fantastic FET-s
I have setup some great Class A Amplifier using them in my Spice.

HAFLER XL-280 looks like original use SK134 / 2SJ49 Hitachi Lateral MOS.
The input stage of HAFLER XL-280 is a symmetrical dual differential
Complementary NJFET + P-JFET: 2SK147 + 2SJ72.

This is an amplfier with Symmetrical JFET input and Push-Pull Symmetrical MOSFET output.
A great amplifier design and should be one amplifier to LOVE.
I understand why you can be very happy with your amplifier, reiver

Lineup
http://www.hafler.com/techsupport/pd...80_amp_man.pdf
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Old 21st November 2008, 04:34 PM   #616
PMA is online now PMA  Europe
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This is something I built in 1980 . Still works.
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Old 21st November 2008, 05:15 PM   #617
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Quote:
Originally posted by PMA
built in 1980
Put **2955/**3055 under the Tesla logo and it's an amplifier lots of people still assemble this very day.
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Old 21st November 2008, 05:24 PM   #618
PMA is online now PMA  Europe
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In Turbo versions?

But this one in 1980 was not bootsraped anymore ..
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Old 22nd November 2008, 04:08 AM   #619
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Click the image to open in full size.

Just had to put the Wooden amp on here. Still going strong
after a week. P4 (frugal)heatsinks are VERY good , full music power without forced air (400ma idle current).
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Old 22nd November 2008, 12:37 PM   #620
fotios is offline fotios  Greece
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Quote:
Just had to put the Wooden amp on here. Still going strong
after a week. P4 (frugal)heatsinks are VERY good , full music power without forced air (400ma idle current).
That's the way! And no so much talk as in your original thread.
This is work and not words!
It is not so pretty, but it works just fine!
Which is finally the circuit that you are using in this prototype from the lot of versions presented?
And only one technical question:
Without load, with a square wave of 5Vpp in input, how much is the output rise time in 10KHz and in 20KHz?
I ask because i use almost the same circuit in my current project.
As for the RC network between the collectors of LTP, a well known company in your neighbourhood at Missisippi, knows better from us.
Bravo OS for your effort!

Fotios
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