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Old 13th July 2007, 10:58 PM   #151
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Quote:
Originally posted by jleaman
Soft Start = Maxhawk GT.

Jase
Jase, what is maxhawk GT? Google gives junk response.

Cheers,

Shawn.
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Old 14th July 2007, 09:54 PM   #152
jleaman is offline jleaman  Belgium
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Here this will help you

Soft switch version 2 anyone?

Jase
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Old 30th July 2007, 10:38 AM   #153
Bee C. is offline Bee C.  Indonesia
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Default My OLD 300W OCL unfinished...

This's my unfinish OCL amp....
[IMG]D:\My documents\Warehouse\Novri_yadi\Personal Files\Project PIC\My unfinished 300W OCL.htm[/IMG]
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Old 30th July 2007, 12:36 PM   #154
pilli is offline pilli  France
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Default My JLH

It looks quite ugly compared to other things in this post, but it really sounds good!

It's my JLH, version "2003 update" (I think that's what it's called)
with CapMult, A970 input T, A733 ccs (maybe not copletely stable), C3421 driver, 15003 output T.
Works at 24V and 1,25A quiescent current.

Made it all by myself, pcb from Eagle and toner transfer, and many parts from wrecked equipment. Very proud.

It took me forever to tame the last buzz, and I should just have followed the "earthing" instructions...
But since yesterday I have my own class-A, and it is sweet.


Many thanks to diyaudio!!
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Old 30th July 2007, 12:42 PM   #155
Nordic is offline Nordic  South Africa
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Bee, you need to use the attach function, for us to see the picture, or upload it to an online host....if you want to use the [img] tags like you did.

At the moment only you can see that picture, because it points to a file on your PC...

The rest of us only see
[IMG]D:\My documents\Warehouse\Novri_yadi\Personal Files\Project PIC\My unfinished 300W OCL.htm[/IMG]
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Old 30th July 2007, 12:42 PM   #156
pilli is offline pilli  France
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Default My JLH

...detail of the main amplifier card.

Input cap is 3 x 470nF "KP".
I have a jumper to try with and without cap on the feedback.
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Old 30th July 2007, 12:50 PM   #157
pilli is offline pilli  France
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Default My JLH

...and the transformers.

These come from eBay (the guy still sells some of the same).

I would appreciate an opinion about these transformers.

I took them because they were cheap and I use them for my prototypes. They give 19-0-19V and are "labelled" 160VA.
I have them on a separate "piece" and I'll replace them with "better" tranformers as soon as I get a good deal.
Or are these any good?


* * *

Next in the list: build a GEM.

The better of the two (JLH or GEM) will go in a high-WAF enclosure, the other will play music too, but in my own working room.

This JLH is sweet, but I could do with some fuller medium-bass when playing rock; for jazz and classical I can't stop listening!

(My references: an Audio Analolgue Puccini SE and a Creek 4140; my source: Cambridge CD3, which is a sweeeeet 4xTDA1541A; speakers: Opera Platea two-way small columns)
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Old 31st July 2007, 07:57 PM   #158
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Pilot module of my KRYPTON se class-a amplifier:
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Old 1st August 2007, 06:53 AM   #159
geminni is offline geminni  Yugoslavia
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I think that bottom right resistors are burning more then others. Check if somethings wrong.
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Old 1st August 2007, 07:05 AM   #160
luka is offline luka  Slovenia
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Hi

They heat up somewhat a lot, but you can still read the value, so they are ok, but you could put in ones with more power rating, for longer life of amp IMO
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