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Old 24th January 2009, 05:18 PM   #11
steenoe is offline steenoe  Denmark
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Quote:
Originally posted by Bakmeel
This is me wiring up the second stage of the CLC filter.

Holy Canoly. Heavy metal



BTW
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Old 24th January 2009, 05:28 PM   #12
Bakmeel is offline Bakmeel  Netherlands
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Quote:
Originally posted by steenoe


Holy Canoly. Heavy metal



BTW

Didn't I mention in the beginning I exaggerated a bit on the power supply?

Maybe I went a bit over the top, but I remember one of our fellow Pass Forumers to say "If more is better, than too much is just enough"...

Indeed, I've taken a lot precautions not to make any shorts... The equivalent energy stored in these caps when operation (55V) is enough to make a shot of water (about 3 cl) boil instantly....

This is part of that precaution: The soft-start control circuit (see third post)
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Old 24th January 2009, 05:33 PM   #13
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You've got my vote for the PassDiy Hall Of Fame! Very Impressive.
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Old 24th January 2009, 05:47 PM   #14
Helmuth is offline Helmuth  Netherlands
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Quote:
Originally posted by Bakmeel
Heej Helmuth,

Speakertjes zien er puik uit! Mooi afgewerkt!
En nog snel klaar ook als er maar netjes gezaagd is.

Quote:
Next mount is the primary capacitor bank. 2 x 4 x 33.000uF / 63V Vishay BC Components. Copper strips to connect the lot together.

The primary capacitor bank is part of a CLC filter combination. More on the filter next post.

I've wired the capacitors in a kind of X- wiring. The current paths through the copper strips cross one another such that the impedance seen on each capacitor is identical, and they all filter an equal share of the ripple current.
Your amp will also look very professional. One for your successors.

What do you predict how long it will take to finish the Aleph 2.

Regards helmuth
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Old 24th January 2009, 05:54 PM   #15
Zen Mod is offline Zen Mod  Serbia
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dooh !

that's fugly!
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Old 24th January 2009, 06:11 PM   #16
Bakmeel is offline Bakmeel  Netherlands
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Quote:
Originally posted by Zen Mod
dooh !

that's fugly!

What is FUGLY?
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Old 24th January 2009, 06:37 PM   #17
Bakmeel is offline Bakmeel  Netherlands
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Behold.... the amplifier Front End PCB.

Everything that does not need enourmous cooling is mounted here...
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Old 24th January 2009, 06:43 PM   #18
Bakmeel is offline Bakmeel  Netherlands
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I have treated the copper sides of all PCB's with Conformal Coating to protect them against corrosion and dust.

A small exception is made where I've planned an electrical contact with crimp lugs, such as the power supply connections on the Front End PCB (the rightmost part is not coated)
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Old 24th January 2009, 07:38 PM   #19
Bakmeel is offline Bakmeel  Netherlands
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And so, the Front End PCB is married with the structure and the power supply.

The big power supply cables are bolted to the copper traces with lugs. The two small white wires are the connection to mains ground. There is a small relay on the mains PCB where the ground can be lifted if one would need to eliminate a ground loop.

With this approach, the all so important star ground pount is exactly at the speaker return point.
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Old 24th January 2009, 07:43 PM   #20
Merijn is offline Merijn  Netherlands
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Sweeeet....
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