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Old 10th January 2010, 06:03 PM   #31
kenev is offline kenev  Greece
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HI Stream,

Excellent work!!

Just a quick question: in your latest layout I see a TO-92 device, named Q7 and labelled as "1815". Is that the BC550 transistor (Q3) shown at the schematic in post #11?

Regards,
Evangelos
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Old 11th January 2010, 10:45 AM   #32
Stream is offline Stream  Russian Federation
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Hi kenev,
Thanks for kind word.
It is 2SC1815. You can use ZTX450 instead or BC550, but BC550 has another pinout (as I remember).

My build is going slowly. 9 Jan I ordered last parts, and today "laserprinted" amp's pcbs (but not etched yet).
Click the image to open in full size.
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Old 12th January 2010, 05:32 AM   #33
kenev is offline kenev  Greece
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Hi Stream,

Thank you for your reply.

I have downloaded the freeware version of Eagle and have been trying to find out how I can print the board (just the "copper" part), but couldn't come to a result. Is there any quick instructions you could help me with?

Regards,
Evangelos
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Old 12th January 2010, 04:44 PM   #34
Stream is offline Stream  Russian Federation
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kenev,
Goto:
View -> Display\Hide layers...
Check only:
Bottom, Pads, Vias, Holes.
Then just print this
BTW don't use my PS design - it's unfinished!

P.S. Can Anyone help me with ground wiring? Check this please:
Click the image to open in full size.
Click the image to open in full size.

Last edited by Stream; 12th January 2010 at 04:58 PM.
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Old 13th January 2010, 07:07 AM   #35
Stream is offline Stream  Russian Federation
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Hmm... Answer is in Marcello's files (from article)
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Old 1st November 2012, 09:44 PM   #36
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Hi! Could you please upload the last eagle file again? Thank you.
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Old 4th November 2012, 01:04 AM   #37
Telstar is offline Telstar  Italy
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Quote:
Originally Posted by Melon Head View Post
If you have LU1014D jfets and if you don't already have your heart set on this design, then I would seriously consider something like Patrick's DAO Headphone amp.
I know it is an old post, but I have a nice stock of lovoltech power jfets, can someone point me to this design?
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Old 4th November 2012, 01:08 AM   #38
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Some other Source Follower COnfigurations

look here,
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Old 17th February 2013, 08:58 PM   #39
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Default Hum?

Hi there,

I am not trying to hijack the thread. I am posting here as this thread seems to be still active.
I have finished my Marcello's head amp today.
The only thing worries is the hum. With the original 4700uF-5.6Ohm-2200uF it is not really acceptable for any hifi listening (I am using Senn 595 - 50Ohm version).
I still have some longish cables running around, but I am pretty sure the hum comes from the PSU. I doubled the capacitors. The hum is almost acceptable, but it is not ideal. I am pretty sure I can get rid of teh hum if I increase the caps even more. Still I think I might have done something wrong as I cannot believe Marcello would be happy with the amount of hum in the original circuit.


Can anybody comment on this?


Greg
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Old 18th February 2013, 11:25 PM   #40
6L6 is offline 6L6  United States
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Well-lit, in-focus photos please. Perhaps there is a wiring error or something in the physical layout...
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