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Old 2nd April 2017, 03:25 PM   #1
Boydk is offline Boydk  Denmark
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Default Aleph Ono Clone help

Hi guys....
Hope somebody in here has some hints to share.
I just finished my Aleph Ono clone today, and while one channel works flawless, I have a problem with the other. I´m able to adjust the 350mV operating point on both, although the faulty channel requires around 100 ohms more than the good one (measured on R25P). On the good channel, the voltage across R65-47ohm is around 600mV (the schematics says 420mV), so I guess this is ok. On the faulty channel the voltage across R65 is 7,6volt, it starts smoking, Q8 and Q19 gets extremely hot. I´ve checked for shortage, missoldering and similar but can´t find anything.
I sold most of my mesuring gear to my old job, got fired and now my only gadget is a digital multimeter.
Any help will be highly appreciated :-)

Edit. The boards are the blue ones made by Nagard (just for info)

Last edited by Boydk; 2nd April 2017 at 03:27 PM. Reason: Some missing info
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Old 2nd April 2017, 04:40 PM   #2
Zen Mod is online now Zen Mod  Serbia
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so , ask Nagard for help .........

or post enough info here , just to not have us guessing from the dark ..... regarding physical layout and exact schematic
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Old 2nd April 2017, 05:12 PM   #3
Boydk is offline Boydk  Denmark
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I haven´t figured out how to upload pictures yet, sorry for that.
No need to be rude though. Just thought that a lot of people here know the Aleph One, have built the themselves, and might know. The schematics are the original Ono, so are the component values and designations. Why would the layout matter in this??
Why don´t you just stay out of the tread, if you´ve got nothing to offer???
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Old 2nd April 2017, 05:38 PM   #4
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Quote:
Originally Posted by Boydk View Post
I haven´t figured out how to upload pictures yet, sorry for that.
In the 'Reply to Thread' window, scroll down to find the 'Manage Attachments' button.
Quote:
Originally Posted by Boydk View Post
Just thought that a lot of people here know the Aleph One, have built the themselves, and might know.
Aleph 1 power amp or Aleph Ono preamp? And is that the X Ono or something different?
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Originally Posted by Boydk View Post
The schematics are the original Ono, so are the component values and designations. Why would the layout matter in this??
I don't think many people have the inclination (or time) to go searching for the information - schematic, layout, etc.. to answer your questions, unless you make it easy for them. People here are extremely helpful (some in their unique ways ) but we need to do our parts as well.
(Unless they have memorized the schematic and know what you are talking about when you refer to R25P or R65.. ).
You can easily add links to the schematics, and other info using the 'Internet Link' button at the top of the reply window - between 'Increase indent' and 'Remove link'.
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Old 2nd April 2017, 05:45 PM   #5
Boydk is offline Boydk  Denmark
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Thanks VG :-)
I´ll try to sort it out.

Seems to work :-)..... Thanks. The fiberoptics were not finished in this picture.
They are glued to one LED each and then used as indicators in the black acryllic front panel.
I´ll find a better picture in a moment

I don´t know, if it´s OK to upload the schematics.
If not, I hope an admin can remove it again.
Attached Images
File Type: jpg Pass 6.jpg (145.0 KB, 204 views)

Last edited by Boydk; 2nd April 2017 at 05:50 PM.
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Old 2nd April 2017, 05:51 PM   #6
Zen Mod is online now Zen Mod  Serbia
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Originally Posted by Boydk View Post
.......
Why don´t you just stay out of the tread, if you´ve got nothing to offer???
yup , why not ......
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Old 2nd April 2017, 06:04 PM   #7
Boydk is offline Boydk  Denmark
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Picture of one channel and schem....
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File Type: jpg Pass 7.jpg (225.7 KB, 199 views)
File Type: jpg Visio-ALEPH ONO-page-001.jpg (548.7 KB, 201 views)
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Old 2nd April 2017, 06:35 PM   #8
AuroraB is offline AuroraB  Norway
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I'm in the process of finishing two Ono sets which have been sitting around half-finished for ten years ( for various reasons ). I too have some issues with odd voltages, but I left the boards at the lab at work. The voltages indicated on the schematic, - are those your voltages, or what they are supposed to be???
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Old 2nd April 2017, 07:06 PM   #9
Boydk is offline Boydk  Denmark
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Hi AuroraB.
The voltages indicated on the schematic are what they´re supposed to be.
I´ve done some more measures, and ooops.....
The right channel (which I thought was OK) has issues too. On the junction R10/R27 right before the output cap, I have 16 volts instead of around 80mV. On all I´ve read about the Aleph Ono, I never read anything about matching the IRF´s. Could it be, that they are so different in specs, that this is the result, and maybe it would help to match Q7/Q18 and Q8/Q19 ???

Good to have a fellow diy´er with similar problems :-)
Hope we get them sorted out.
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Old 3rd April 2017, 06:52 AM   #10
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I guess you know that LED D5 must have an Vf about approx. 1,6V?
Otherwise Q7,8,18,19 are getting hot cause the value about R25 is wrong.
The fiber optics for this position is not a good idea ...

Kind regards

Andreas
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