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Aleph J illustrated build guide
Aleph J illustrated build guide
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Old 4th March 2018, 10:59 PM   #2501
mkane77g is offline mkane77g  United States
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Aleph J illustrated build guide
PS PCB & 2 UMS 40x300mm heatsinks ordered along with the pieces to finish the Aleph J & PS. I'll get on this after vacation.
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Old 9th March 2018, 05:23 PM   #2502
DSMStudio is offline DSMStudio  United States
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I'm purchasing the AS-4220 - 400VA 20V TRANSFORMER and plan on using the Diodes and heatsinks instead of the bridge. For caps I was planning on 88,000 uF per rail. For the diodes, are the 30A 200V still okay ?

These are what I was looking at-

FFA60UP20DNTU ON Semiconductor / Fairchild | Mouser

Thanks,

David
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Old 9th March 2018, 06:22 PM   #2503
KevinHeem is offline KevinHeem  United States
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Aleph J illustrated build guide
18V secondaries are specified, why the AS4220?
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Old 9th March 2018, 06:37 PM   #2504
DSMStudio is offline DSMStudio  United States
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Quote:
Originally Posted by KevinHeem View Post
18V secondaries are specified, why the AS4220?
Quote:
Originally Posted by 6L6 View Post
Honesty, buy the 20V.
Some of the recommendations on the forum. I just want to make sure that I change what needs to be changed for this transformer on the PCB board.
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Old 9th March 2018, 07:06 PM   #2505
KevinHeem is offline KevinHeem  United States
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Aleph J illustrated build guide
Didn’t know that...I’m new to this thread. You would want to have caps rated at at least 35V as you’ll be making ~28 V after the rectifiers.
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Old 9th March 2018, 07:18 PM   #2506
DSMStudio is offline DSMStudio  United States
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Originally Posted by KevinHeem View Post
Didnít know that...Iím new to this thread. You would want to have caps rated at at least 35V as youíll be making ~28 V after the rectifiers.
Thanks. I'm new here too and although I can build with clear instructions, I am still lost when it comes to understanding the electrical principles.
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Old 9th March 2018, 07:43 PM   #2507
6L6 is offline 6L6  United States
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Aleph J illustrated build guide
The 20v transformer will make no real differences aside from maybe a bit more power. No changes need to be made to the circuit aside from using 35v caps in the PSU, which is just a good idea in general.

The diode you picked out is in the TO-3P package, and might not fit a standard heatsink. TO-247 is just a tad smaller and will fit most PS mount sinks like the ones needed for the discrete bridges.


BYV72EW-200,127 WeEn Semiconductors | Mouser
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Old 13th March 2018, 08:29 PM   #2508
mkane77g is offline mkane77g  United States
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Heatsinks & PS board arrived. Heatsinks are huge
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Old 16th March 2018, 01:15 AM   #2509
Blk Dynamite is offline Blk Dynamite  United States
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I have a rookie question.

Finally going to start building this amp in the next week or so (hopefully family doesn’t bug me) and I plan on using an inductor (one for each rail) instead of resistors on the store power supply board. Would I simple wire the inductor in one of the open spots for the resistor or would it go somewhere else?
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Old 16th March 2018, 02:00 AM   #2510
6L6 is offline 6L6  United States
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That is correct.
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