Aleph J for Universal Mounting Spec - Page 16 - diyAudio
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Old 8th February 2013, 09:58 AM   #151
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C6 : 100nF - 1uF or just leave empty
R28,29 : depend on LED, 3-5Kohm
R30 : wire jumper, or 1 - 100ohm

Didiet
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Old 8th February 2013, 10:14 AM   #152
henryve is offline henryve  South Africa
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Didiet

Am I correct in assuming that LED1 has been dropped from this PCB?
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Old 8th February 2013, 10:20 AM   #153
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Yep and change to Led2 and Led3. Just to show all voltage rail are ok (request from 6L6)
And C6, C7, R30, J1, J2 are sugested by ZenMod

Didiet

Last edited by didiet78; 8th February 2013 at 10:24 AM.
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Old 8th February 2013, 10:48 AM   #154
henryve is offline henryve  South Africa
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I am making an assumption that C2 and C3 can be 16V electrolytics. Obviously something like Elna Silmic II or Nichicon FG or KZ.

Last edited by henryve; 8th February 2013 at 10:48 AM. Reason: Spelling
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Old 8th February 2013, 11:13 AM   #155
henryve is offline henryve  South Africa
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For C4; is 35V or 50V OK? I was thinking 50V?
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Old 8th February 2013, 11:18 AM   #156
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For C2 and C3 min 35V or even better 50V, for C4 25V would be fine.

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Old 8th February 2013, 12:42 PM   #157
henryve is offline henryve  South Africa
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Updated BOM. Please give some feedback. 6L6, Didiet; please check if C2 and C3 can accommodate capacitors with a lead spacing of 7.5mm.
Attached Files
File Type: pdf BOM-Aleph-J-UMS.pdf (298.0 KB, 45 views)
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Old 8th February 2013, 02:54 PM   #158
6L6 is offline 6L6  United States
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Quote:
Originally Posted by henryve View Post
I see on the original schematic from Nelson that R7 is 1K. So it just makes sense for a 2K multi-turn pot.
Yes, a 2k is perfect there.

The 500ohm is a reference to the Aleph Jango, and not appropriate to the Aleph J -- my mistake.

Good catch, BTW!!


Quote:
I usually prefer the 25 turn ones, not the flat ones which only provides 1 turn resolution.
That's a good thing to make note of on the BOM - please illustrate why you are making the choices and also what other type of peices can work. This way people can learn something about parts selection, and also have alternatives in mind if their suppliers don't have the 'right' part.

Quote:
6L6, Didiet; please check if C2 and C3 can accommodate capacitors with a lead spacing of 7.5mm.
I will be happy to send you actual measurements from the PCB once I have them in hand, Didiet can tell you the dimensions in the meantime.
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Old 8th February 2013, 03:44 PM   #159
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I think the best way is not to replace a resistor by a pot. if you use a resistor in series to the pot resistance can never below the value of the resistor and the pot gets easier to adjust. ...
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Old 8th February 2013, 04:21 PM   #160
henryve is offline henryve  South Africa
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BOM updated with more trimpot info.

I would like to have some input from experience DIYers out there. From an image of the PCB I can see that only the 3386K model single turn pot will match the pin arrangement. However, I see that neither Mouser nor Digi-Key have stock of that specific model. Advice will be valued. I have also attached the Bourns 3386 data sheet, so if one of you out there can have a look at that it would be very helpful.

I also tried the Vishay model 36P as specified on the PCB, and did not have luck either although it does seem that RS stock some values for the Vishay range.
Attached Files
File Type: pdf BOM-Aleph-J-UMS.pdf (305.6 KB, 38 views)
File Type: pdf Bourns-3386.pdf (263.7 KB, 31 views)

Last edited by henryve; 8th February 2013 at 04:42 PM. Reason: sentence structure
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