Parasound Halo JC 2 Circuit. - diyAudio
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Old Yesterday, 03:24 AM   #1
ammel68 is offline ammel68  United States
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Default Parasound Halo JC 2 Circuit.

I've seen quite a few favorable reviews of Mr. Curl's Halo JC 2 preamp, but I've not seen anything about the actual circuit itself, either here or anywhere else.

Does anyone, other than Mr. Curl (whom I'm sure isn't going to comment on one of his most successful designs) know anything about the JC 2's circuit, or with this being a current Parasound product does copyright and/or trademark infringements come into play?

Thanks...
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Old Yesterday, 04:47 AM   #2
kamis is offline kamis  Serbia
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JC-2 diagram
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File Type: pdf JC2.pdf (243.5 KB, 106 views)
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Old Yesterday, 04:17 PM   #3
ammel68 is offline ammel68  United States
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Wow...thank you for the schematic!
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Old Yesterday, 05:45 PM   #4
sreten is offline sreten  United Kingdom
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Hi,

You can build it for personal use. You can't sell it commercially.

rgds, sreten.
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Old Yesterday, 06:12 PM   #5
SY is offline SY  United States
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Why not, as long as you don't use the trademark? Is there something in the circuit that's covered by an unexpired patent?
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Old Yesterday, 06:16 PM   #6
RNMarsh is offline RNMarsh  United States
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It appears like there are errors in the schematic drawing. ??
Try to sim it first.

THx-RNMarsh
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Old Yesterday, 09:51 PM   #7
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Yes, do as SY says: Why buy knowledge when you can copy it? '-)
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Old Yesterday, 09:54 PM   #8
ammel68 is offline ammel68  United States
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Quote:
Originally Posted by RNMarsh View Post
It appears like there are errors in the schematic drawing. ??
Try to sim it first.

THx-RNMarsh
There could be Mr. Marsh. Hopefully someone here will sim it.

I see several resistors with values that aren't labeled(???).

I'm still trying to figure out what a 2SK247 is.
From the schematic it appears to be one of those 2 matched jfets sealed up in one package like the 2SK389, but a Google search turns up some device made by Panasonic.
2SK247 Datasheet(PDF) - Panasonic Semiconductor
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Old Yesterday, 10:16 PM   #9
SY is offline SY  United States
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Quote:
Originally Posted by john curl View Post
Yes, do as SY says: Why buy knowledge when you can copy it? '-)
Apparently that was Voices-In-John's-Head-SY, rather than the actual one.
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Old Yesterday, 10:27 PM   #10
kamis is offline kamis  Serbia
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I think that J-fet is 2sk246 instead of 2sk247 which is complementary to 2sj103. Unlabeled resistors depends on the given idss value of actual J-fets and should be adjusted to give desired output current.
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