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Old 3rd February 2012, 10:36 AM   #1
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Default several Aleph's in one big case

I am building a new 8-channel amp. 4 aleph 60's and 4 alep30's in one big case
It is an extention from my stereo-system to 5.1 (all active).
My question is;
As all 8 unbalaced inputs are connected to one active filter, so sharing the signalground, should I connect all powersupply ground (from all 8 Aleph's) to eachother? All 8 amps are in one case, should I consider it to be one amp or as 8 amps in one case? What's the best internal wiring? All seperate or all together?
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Old 3rd February 2012, 12:37 PM   #2
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with picture
so maybe will react faster
notice the cd for size reference


see build here;
http://www.zelfbouwaudio.nl/forum/vi...hp?f=7&t=11329
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Last edited by aaronboumans; 3rd February 2012 at 12:42 PM. Reason: forgot something
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Old 3rd February 2012, 12:48 PM   #3
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Quote:
Originally Posted by aaronboumans View Post
....should I connect all powersupply ground (from all 8 Aleph's) to eachother?...
let each stereo PSU have it's gnd connected to chassis via 10-20R NTC

that , with proper layout of power buses and input cables , will give you hum free operation.

hopefully
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Old 4th February 2012, 01:48 PM   #4
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wow, that's a lot of heat to dissipate in one case...

my Aleph 2 mono blocks look about as big, when put side by side

good luck finishing it up!
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Old 4th February 2012, 03:56 PM   #5
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zen mod; so all eight grounds seperately with 8 NTC's to chassis.
Can you explain why? thanks
@moe29
I will measure the heatsink for proper comparison
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Old 4th February 2012, 05:49 PM   #6
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you said :

Quote:
As all 8 unbalaced inputs are connected to one active filter, so sharing the signalground
so - fact is that each PSU must be connected to safety gnd , same as case ;

if you connect those PSUs ( read - PSU grounds) ditto to safety gnd , you'll have gnd loop between inputs and PSU side gnds

when you connect those PSU gnds via 10-20R NTCs , that resistance is usually enough to avoid gnd loops

read Pass papers - there you'll find pretty clear and often humorous explanation for all important audio things

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Old 4th February 2012, 06:28 PM   #7
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like this?
http://www.dz3w.com/uploadfile/2010/...5101057521.gif
in the right lower corner, the thermistor?
From circuit and chassis ground to the NTC to the AC outlet ground.
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Old 4th February 2012, 06:32 PM   #8
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sort of , but not exactly

look in F5 pdf , for instance

there are two NTC's - one in-line with mains (as soft start) , and another one between gnd and chasiis , which is directly on safety gnd
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Old 4th February 2012, 07:16 PM   #9
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and I should do this will amps in the one case. All 8 gnd throught 8 ntcs to chassis/acgnd
Ok
thanks Zen Mod
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Old 6th February 2012, 08:56 AM   #10
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I measured the heatsink;
its 96x50x33 cm(24,4x19,7x13 inch)
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