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Old 2nd May 2012, 07:30 PM   #1331
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Quote:
Originally Posted by SCAIFF001 View Post
Hi,

Sorry I have not been looking here for a few weeks. The heatsinks I am useing are two for each mono Aleph J-X, each of the two with a value of 0.33 degC/W, these also have one 5in. fan each attached to the each heatsink, the two heatsink fans are fed by two additional 5inch fans cooling the power supply components by having the two fans mounted inside the enclosures first & second barrier and the air is sucked by the first chaimber power supply components, these fans then blow the air through the three next air tight compartments and finally becomeing the source air for the power transistor heatsinks quietly keeping the output transistors with a tempiture of below 60degree Celcius while using a high bias.

here is the heatsink I am useing:
D180-20 - AAVID THERMALLOY - HEAT SINK, T SLOTS | Newark/element14 Canada

Thank You For Your Interest

Ian
Better (very) late than never...

Thank you!
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Old 3rd May 2012, 06:24 PM   #1332
mace_be is offline mace_be  Belgium
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Hello,

I am kinda new here. (Going to build an AJX 100 or 80)

Maybe an heatsink shop in europe tip:

Any one tried ordering the heatsinks only in the spare part section of the shop that sells hifi-2000 cases in italy ?
modushop.biz

In a few months i am going to try to order the spare parts only.
30 Euro's looks like a great price for an 300 X 40 H 210 mm HS.
But i am afraid they won't let you buy it seperatly.

I have also a question concerning PSU designer :

Where do you guys get the Transformer source resistance value ?
I looked at datasheets of toroids but dont find it.
- Is the impedance of the secondary wire ?
- You can just calculated it via the law of Ohm ?
I.E R = 18volts/22ampere (800va 2x18v toroid)

Best regards,
Jannick
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Old 6th May 2012, 06:29 AM   #1333
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Default mounting front end board

Hi,

When I look at the front end board it seams to me that the GND & SG are connected, is this true ?

Thank You

Ian
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Old 6th May 2012, 06:54 AM   #1334
qusp is offline qusp  Australia
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use a multimeter....
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Old 16th May 2012, 10:55 PM   #1335
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Can anyone post the BOM on the first post of this thread? It would be appreciated.

Thanks
Do
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Old 24th May 2012, 12:21 PM   #1336
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Default speaker Xover with ballanced amplifier

Hi Everyone,

I was just thinking that since the output of a ballanced amplifier is just the same signal for positive & negative 180degrees out of phase then the xover must have the same filter components on its positive and negative speaker cables ? I was thinking of this because I am now assembleing my Aleph J-X input Line Level Crossover of 12db per octive at 100Hz, and here I must treat the positive and negitive Line Level Inputs with the same filter components, inother words two seporate xovers, one for positive Line and one for the negative Line.

Thanks For Any Help With This Issue So I Dont Blow My Speakers

Ian
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Old 24th May 2012, 12:32 PM   #1337
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I think this is a non-issue.
But you raise an interesting question.
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Old 24th May 2012, 12:37 PM   #1338
Zen Mod is offline Zen Mod  Serbia
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that's not a question ;

at least not if considering type of amplifier output stage

AC is AC
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Old 24th May 2012, 01:19 PM   #1339
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Quote:
Originally Posted by pinnocchio View Post
Can anyone post the BOM on the first post of this thread? It would be appreciated.

Thanks
Do
Aleph J-X Amp Project
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Old 24th May 2012, 01:39 PM   #1340
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Quote:
Originally Posted by SCAIFF001 View Post
Hi Everyone,

I was just thinking that since the output of a ballanced amplifier is just the same signal for positive & negative 180degrees out of phase then the xover must have the same filter components on its positive and negative speaker cables ?
Ian
You bastard.
This is doing my head in.
If the positive phase of the signal is split through the passive crossover network, but the negative phase is not, resulting in the full frequency response of the negative phase across all woofers, then ...............
I am sure it must be a non-issue, but this is giving me a headache
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