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Old 11th April 2009, 01:29 PM   #2321
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I assumed that Fix was just looking to verify that the circuit was assembled correctly and not planning to use the cube long term or for anything resembling serious listening.

At 2.6 A he's probably already on the verge of the current limiter kicking in, if not started down that slope. That won't help the sound quality.
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Old 11th April 2009, 04:32 PM   #2322
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by BobEllis
At 2.6 A he's probably already on the verge of the current limiter kicking in, if not started down that slope. That won't help the sound quality.
that might be why the sinewave sounds/measures clean. Sub watt output with zero transients using up that little overhead.
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Old 11th April 2009, 10:39 PM   #2323
Fix is offline Fix  Sweden
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Thanks for all posts, I'm pretty sure that my powercube is the problem...

Yes just run the powercube to Test the amp, but I thought I could test the amp more serious with it.

I do have 2x 1000va trafos at 41V @ 12amp

I'm about to the the amp for real with trafo + caps and recifiers.
just ready with the powersupply...

Will post pictures soon...
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Old 12th April 2009, 12:33 AM   #2324
Fix is offline Fix  Sweden
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Another night...

Atlast, first channel is up and running 100% with powersupply.
And it's working, and right now I play music from my Laptop...

625mv att emitter
57.5vdc at rails
~50* C with fan at fullspeed (if my tool is working...)

After about 2h of running...


Powersupply...
Click the image to open in full size.

Photo before I start it up... (just incase of smoke...)
Click the image to open in full size.

Now we are running...
Click the image to open in full size.
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Old 12th April 2009, 12:58 AM   #2325
AndrewT is offline AndrewT  Scotland
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Hi,
Klone up and running.
Well done.
Let the fuse blowing begin, if your's follows the same behaviour as mine did.

BTW,
can you see now why I have to repeatedly remind builders that fixed current limits in regulated supplies will almost certainly impact on the correct operation of power amplifiers?
They need enormous current to do their job well. Most builders don't realise this.
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Old 12th April 2009, 08:00 PM   #2326
Fix is offline Fix  Sweden
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Thanks Andrew...

Fuse... For the moment I don't have it fused... :-)
Guess that's stupid, but I'll add it later...

Yes this Krell Klone is needed BIG trafos with lots of current...

I have a powermeter that I can plug into the wall and read how much Amp and Watt it draws from the mains..

220AC, 300W, 1.36Amp @ one channel.

2.5 Amp + ~600W /hour for listen to good music..
My mainfuse in the house is at 10Amp (for the walloutlets)
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Old 12th April 2009, 10:06 PM   #2327
Fix is offline Fix  Sweden
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DIY-KIT HEATSINKS

I've calculated and started a thread over at Hififorum
All further talk about the Heatsink DIY-KIT will continue there.

www.hififorum.nu/forum/topic.asp?TOPIC_ID=74088
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Old 13th April 2009, 03:09 AM   #2328
groov is offline groov  United States
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Default great work

Cool ...I am still interested. Will follow it up on your new link.
groov
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Old 28th April 2009, 09:05 PM   #2329
Fix is offline Fix  Sweden
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Been busy at work and other IRL stuff.
Will update the Heatsink page soon.

Anyway...

Time for some new pictures..
Just started with the cables...


Click the image to open in full size.

Click the image to open in full size.


Atlast...
My PCB cards came today from China.
The SoftStart and Output DC Sence card.
Hopefully my new design in Eagle will work.... :-)

I've ordered 10x SoftStart and 20x Output DC Sence pcb cards.
If they work as they should they will be for sale, or included in the heatsink kits.

One picture show the Test PCB that I've made first.
That worked...
Also the new design is much smaller and doubleside.


Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.
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Old 29th April 2009, 04:35 AM   #2330
farl is offline farl  United Arab Emirates
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I'm interested for your extra PCB, please reserved for me for 2 SoftStart and 2 Output DC Sence pcb.
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