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|13th June 2006, 04:17 PM||#11|
Join Date: Jun 2006
Hello, I just received my BrianGT Aleph boards as well, and as I couldn't find any component lists on the chipamp site nor coming with the PCBs, I spent my afternoon in the sun, trying to figure it all out using the original Aleph 5 service manual schematics and the PCBs at hand. Now I think that worked out ok - there are just a few changes that I noticed:
-The 10k resistor called R8 on the original schematics connecting the unbalanced input to the balanced + in is missing (probably neither very important, nor hard to fix).
-the 680pF cap called C6 in the original schematics, which is connecting C7 and R8 (or C4/R15 on the BrianGT boards) to Q4 and the G- connector, is missing completely. I have the feeling that this would be a rather important component, and I'd rather have it in my circuit than not - does anybody know anything about the results of not having a cap in this place, or how to get it in there without too much hassle?
My component list so far (BrianGT board numbers):
R1: 10k Ohm
R2: 10k Ohm
R3: 100k Ohm
R4: 221 Ohm
R5: 10k Ohm
R6: not used
R7: 221 Ohm
R8: 221 Ohm
R9: 10k Ohm
R10: 10k Ohm
R11: 221 Ohm
R12: 453 Ohm
R13: 221k Ohm
R14: 4,75k Ohm
R15: 100k Ohm
R16: 1,5k Ohm
R17: 75 Ohm
R18: 392 Ohm
R19: not used
R20: 1k Ohm
R21: 221 Ohm
R22: not used
R23-26: 0,47 Ohm, 3 Watt
R27,28: not used
R29-34: 221 Ohm
R35-40: 1 Ohm, 3 Watt
C1-C3: 220 µF
C6: not used
C7 (not on board yet): 680 pF
Any comments/critizism/advice is absolutely welcome!
|31st July 2006, 06:15 PM||#12|
Join Date: May 2006
i got Brians miniAleph Boards too and worked the forums to find out any information why Brian skipped/changed parts/values.
btw, thx Brian , these red boards are just phantastic
great site, good work !
To PolishedSteel :
The Original R8, at the unbalanced input, is a 1000Ohms,
and yes its missing in Brians boards. I wonder why.
Your Component List is wrong. Go see the xls-sheet at :
D1-D5 9.1v zener
R19 not used
R22 not used
R27 not used
R28 not used
R49 not used
Q6-Q7 not used
To Brian or any1 that wants to contribute:
1. Brian added R0 3Ohms 3Watts, pulling the zehner diodes to gnd. why?
3. Original R13 / Brians R5 have different values.(10k/4.75k)
4. Original R17 / Brians R14 have different values (4,75k/1.5k)
6. Original C7 47nF sitting between C and E of this MPSA18 has changed position and value to 1 nF in Brians. Now between C and B of this ZTX450.
7. The Original C6 680pF is missing...
I cant wait to get the parts together to build my 1st Aleph-5 , hehe.
I just finished my PS1-Powersupply with 2 toroid transformers.
Used LT1084 for each Voltage-rail muuuuahhrrharrr
Unluckily , this dude at the shop sold me the 12Volt fixed ones and i didnt noticed it untill i ran the tests this morning...
now i had to order 2 new ones at reichelt.....
Thank you Nelson Pass , it was the simplicity of the circruity that made me consider diy. ...bows..
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