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Old 17th March 2011, 07:59 AM   #1731
sajti is online now sajti  Hungary
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This is the solid state output stage of my new hybrid project. The pcb contains the protection as well.

Sajti
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Old 18th March 2011, 06:04 AM   #1732
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This is the solid state output stage of my new hybrid project. The pcb contains the protection as well.

Sajti
Nice ,ON - NJW0281/0302 powered 250W (4 pair). Looks like a full comp. VAS w/ current sources.

OS
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Old 18th March 2011, 06:12 AM   #1733
sajti is online now sajti  Hungary
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Nice ,ON - NJW0281/0302 powered 250W (4 pair). Looks like a full comp. VAS w/ current sources.

OS

Hi OS,

You can check the schematic, and some more details in My new hybrid amplifier topic.


Sajti
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Old 18th March 2011, 06:20 AM   #1734
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Thank you !

I think that these two radiator heat dissipation in range from 30-35W for each.
That case's heatsinks should carry 120-150w/8R (class AB-B) per channel , same style and size as most of the DH haflers , yamaha pro 100-125w units. The sony,nikko,jvc's use the "skived" (they shave the fins off of a solid block) aluminum heatsinks (below 1) ... about double the C/watt capacity . That one below can do 480 watts. they are not as durable , most are internally located.

OS
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Old 18th March 2011, 06:24 AM   #1735
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Hi OS,

You can check the schematic, and some more details in My new hybrid amplifier topic.


Sajti
Ahhh , triple .... unique cascoded design. Have you "blasted" (listened) yet??

PS in the real world (OEM) , your 4 pair of NJW's in triple mode can be honestly rated at 300/500 watts (8/4R). provided your rails are below 65V (this is where the "knee"- dropoff in the NJW's SOA is).

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Last edited by ostripper; 18th March 2011 at 06:28 AM.
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Old 18th March 2011, 06:37 AM   #1736
sajti is online now sajti  Hungary
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Ahhh , triple .... unique cascoded design. Have you "blasted" (listened) yet??

PS in the real world (OEM) , your 4 pair of NJW's in triple mode can be honestly rated at 300/500 watts (8/4R). provided your rails are below 65V (this is where the "knee"- dropoff in the NJW's SOA is).

OS
Not yet. But I hope I can listen it in this weekend.

The maximum output power is about 440W/4ohm, the maximum output is 120Vpp, if the rails not drop more than 1V. Maybe I will make separated PSU for the VAS, with some regulated +/-70V. This means 3V more output. But I think, that it's not really necessary.

Sajti
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Old 18th March 2011, 10:17 AM   #1737
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the "skived" (they shave the fins off of a solid block) aluminum heatsinks (below 1)
Say what ?
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Old 18th March 2011, 10:24 AM   #1738
luka is offline luka  Slovenia
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I see that you have my smps on your site
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Old 18th March 2011, 10:51 AM   #1739
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Old 19th March 2011, 05:53 AM   #1740
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Say what ?
I had doubts , since I last saw one 20 years ago on my JVC ... but I AM correct.

Skived - Definition and More from the Free Merriam-Webster Dictionary

It means to slice off thin layers and it IS the marketing term the Japanese used "in the old days"to describe their "thermal solution".

OS
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