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The JC2-HPA Headphone Amplifier
The JC2-HPA Headphone Amplifier
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Old 2nd April 2020, 12:42 PM   #11
Zung is offline Zung  Switzerland
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Right click or Ctrl-right click on the opamp and make sure you've got the "Prefix X" as in the attachment.
Check if you have z.lib (in the Zung.zip attachment) in the same folder or somewhere LTspice can find.
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Old 2nd April 2020, 01:11 PM   #12
Mark Johnson is offline Mark Johnson  United States
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The JC2-HPA Headphone Amplifier
Thank you for the links! Those predrilled chassis appear to be a good bargain. I wonder whether I can shoehorn a Noir or an ACP+ into that box; it won't cost much money to find out.
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Old 2nd April 2020, 01:28 PM   #13
Zung is offline Zung  Switzerland
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Quote:
Originally Posted by Mark Johnson View Post
Thank you for the links! Those predrilled chassis appear to be a good bargain. I wonder whether I can shoehorn a Noir or an ACP+ into that box; it won't cost much money to find out.
Don't give up hope yet: they come in more size, shape and color than you have time to browse, even during these times of confinement!
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Old 2nd April 2020, 02:13 PM   #14
keilau is offline keilau  United States
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Quote:
Originally Posted by EUVL View Post
Thumbs up for your effort in summarising everything.
But you should not call this JC-2.

It is a E4 headphone amp from Weiliang.
Part of the circuit has similarities to the JC-2 topology.
But that is where it stops.
Thr original JC-2 does not have an output follower, for one.

Cheers,
Patrick
The Weiliang E4 has the JC2 dual differential jFET input topology, and a MOSFET output. John Curl recommended only 2SK170/2SJ74 for the JC-2 input. I am very glad to see the E4 coming back to the DIY market. It is a very cost effective design. Its current price is about half of its first e-bay appearance.

The E19 I have is almost identical to Weiliang's E5. It has the Marantz HDAM input. The jFET are marked as K170, but I doubt that it is genuine stock.
My E5 Class A hifi headphone amp

Last edited by keilau; 2nd April 2020 at 02:36 PM.
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Old 2nd April 2020, 03:34 PM   #15
keilau is offline keilau  United States
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Quote:
Originally Posted by Mark Johnson View Post
Thank you for the links! Those predrilled chassis appear to be a good bargain. I wonder whether I can shoehorn a Noir or an ACP+ into that box; it won't cost much money to find out.
I chosen the T-2205 enclosure because of the size of my E19 headphone amp board and the use of a regulated PSU.
T-2205 headphone Enclosure Full Aluminum amp chassis DAC box Premplifier Case | eBay

It cost a little more, but the extra internal volume is very good for running the amp in class A. Otherwise, you will have to use the case as heatsink. You do have to drill out the front and back panel with relatively large holes. A hand drill will be difficult to use. I have a 8" tabletop drill press, $54 from Harbor Freight. We usually do not have drill bit large enough in our drill bit set. I use a Titanium High Speed Steel Step Bit which works up to 3/4" diameter holes and good enough for most headamp project. Aluminum panel is relatively easy to drill.
Steel Step Drill Set - 3 Piece, Titanium Nitride Step Drill Bits
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Old 2nd April 2020, 03:46 PM   #16
Georg Kovalcik is offline Georg Kovalcik
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None of the libs you posted includes a 2SK246 model.
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Old 2nd April 2020, 03:52 PM   #17
Zung is offline Zung  Switzerland
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Quote:
Originally Posted by Georg Kovalcik View Post
None of the libs you posted includes a 2SK246 model.
It's in z.lib.
Are you familiar with LTspice?
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Old 2nd April 2020, 04:23 PM   #18
EUVL is offline EUVL  Europe
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The E5 and the HDAM topology came from AD797.
One Last Attempt at Discrete Opamp in DIP8 Footprint
One Last Attempt at Discrete Opamp in DIP8 Footprint


Cheers,
Patrick
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Old 2nd April 2020, 04:38 PM   #19
Zung is offline Zung  Switzerland
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Quote:
Originally Posted by keilau View Post
... I have a 8" tabletop drill press, $54 from Harbor Freight...
I'm jealous because in Switzerland, these go for at least $250.
I'm disappointed because it seems HF no longer give out those Super Saver coupons: we used to have a blast getting those DMM's in exchange of $1 and a coupon! I still have one in its original packaging.
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Old 2nd April 2020, 06:32 PM   #20
keilau is offline keilau  United States
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Quote:
Originally Posted by Zung View Post
I'm jealous because in Switzerland, these go for at least $250.
I'm disappointed because it seems HF no longer give out those Super Saver coupons: we used to have a blast getting those DMM's in exchange of $1 and a coupon! I still have one in its original packaging.
The performance of this Harbor Freight drill press is nothing to write home about. It wobbles. But the main inaccuracy comes from my workmanship. I just drill bigger hole to compensate for it. After a year, the hole oversize need is much reduced. But its low price allows me to justify getting a drill press for occasional hobby use. I use it to drill the mounting hole for a customerize hardwood tonearm board too. I can drill the PCB mounting holes at exact diameter now.
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