Aleph J for Universal Mounting Spec - Page 15 - diyAudio
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Old 7th February 2013, 08:43 PM   #141
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This may help. A BOM I did based on the original Aleph J schematic. May just need to mod for the PCB parts and review my choices.
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File Type: pdf aj bom.pdf (13.1 KB, 79 views)
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Old 7th February 2013, 08:51 PM   #142
henryve is offline henryve  South Africa
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Thanks bnorrish. I will use some of your parts and ideas and bring some new ones to the table. Especially thinking of adding the Panasonic 3W resistors also as an option.
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Old 8th February 2013, 12:04 AM   #143
skunark is offline skunark  United States
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Sign me up for a pair as well
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Old 8th February 2013, 12:51 AM   #144
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Post #68 - was that the final layout, schematic?
-R7, R8 are 500 ohm pots?
- What about R27 - what value pot?
- J1 and J2 are resistors - what values?
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Old 8th February 2013, 12:52 AM   #145
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Quote:
Originally Posted by henryve View Post
Thanks bnorrish. I will use some of your parts and ideas and bring some new ones to the table. Especially thinking of adding the Panasonic 3W resistors also as an option.
Go nuts Panasonic blue vs Vishay brown
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Old 8th February 2013, 01:40 AM   #146
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Quote:
Originally Posted by bnorrish View Post
Post #68 - was that the final layout, schematic?
-R7, R8 are 500 ohm pots?
- What about R27 - what value pot?
- J1 and J2 are resistors - what values?
- For R7 pots min 1K, i prefer 2K
- R8 you can use 500 ohm pots, but value for R6 min 560 ohm
- J1 and J2 are gate stoper. You can jumpered or use resistors, wit value from 0 to 220 ohm
CMIIW

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Old 8th February 2013, 01:44 AM   #147
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IT is better to have more headroom wit hpot. Ideally, you hav a fixed value resistor and then another por in series.. Once you get it biased, you can replace with permanent resistor of matching value.
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Old 8th February 2013, 06:54 AM   #148
henryve is offline henryve  South Africa
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6L6

I see on the original schematic from Nelson that R7 is 1K. So it just makes sense for a 2K multi-turn pot. I usually prefer the 25 turn ones, not the flat ones which only provides 1 turn resolution.

Feedback welcome as usual.
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Old 8th February 2013, 09:34 AM   #149
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Default Aleph J Single Layer

This what it like in single layer. Just add Jfet and N-Mosfet and Big Heatsink.

Didiet
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Old 8th February 2013, 10:47 AM   #150
henryve is offline henryve  South Africa
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Right, attached is my first draft of the BOM. I still need some input with regards to the values of the bypas capacitor C6 as well as the values of resistors R28, R29 and R30.

Also I have seen no suggestions for a value of the R27 trimpot.
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File Type: pdf BOM-Aleph-J-UMS.pdf (294.3 KB, 51 views)
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