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Old 1st July 2008, 08:29 AM   #1
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Default Aleph 30: project completed

Six months ago I decided to make this amplifier

Given my limited technical bases (i'm not in the field of electronics) and my character "precise" I bought the PCB ready on www.chipamp.com
The same site provides the entire shopping list to be done where there is more comfortable.

I'm worked mainly in the evening and some weekend stealing an hour here and the hour of my little free time.
The total expenditure was around 500 but wishing you can safely spend half if not less.

Here are some photos stepper
(WARNING! To view, copy and paste the link in a new Explorer's page)

- Power Supply
http://andreafx.altervista.org/Temp/10042008141.jpg
http://andreafx.altervista.org/Temp/10042008143.jpg

- Amps Boards
http://andreafx.altervista.org/Temp/27042008145.jpg
http://andreafx.altervista.org/Temp/27042008146.jpg

The back-and heatsink
http://andreafx.altervista.org/Temp/15062008164.jpg
http://andreafx.altervista.org/Temp/15062008165.jpg

- Assembly cabinet
http://andreafx.altervista.org/Temp/26062008166.jpg
http://andreafx.altervista.org/Temp/26062008167.jpg

Amplifiers completed
http://andreafx.altervista.org/Temp/29062008168.jpg
http://andreafx.altervista.org/Temp/29062008169.jpg
http://andreafx.altervista.org/Temp/29062008170.jpg

The general start for me was a really exciting time and hear the first notes out of the 2 small AP, repaid all the sweat poured.

This is the fourth amplifier that i realize, the first of a certain thickness, shortly starting with the brother Aleph P. ..... Stay Tuned


I attached the amplifier directly to the CD (which has the volume control) taken by the RCA.

I noticed a strong background noise if I link negative signal to earth (with the switch). The background noise disappears when I delete the link to the detriment of gain.
I's normal?

Sorry for my bad English

Andrea
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Old 1st July 2008, 10:02 AM   #2
Magura is offline Magura  Denmark
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Pics not working


Magura
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Old 1st July 2008, 10:05 AM   #3
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Quote:
Originally posted by Magura
Pics not working


Magura

(WARNING! To view, copy and paste the link in a new Explorer's page)

You do it?
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Old 1st July 2008, 10:35 AM   #4
AndrewT is online now AndrewT  Scotland
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Hi,
what is that band around the top of the toroid?

Is it a shorted turn?
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Old 1st July 2008, 10:52 AM   #5
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Quote:
Originally posted by AndrewT
Hi,
what is that band around the top of the toroid?

Is it a shorted turn?
Sorry but i don't understand the terms "shorted turn"

I use the bracket (aluminium) around the trafo to stabilize them in vertical position. There's not enought space to place orizontally.
Under the bracket and trafo i put a neoprene sheet do reduce the mechanical hummm.

I know that is not the best position because the bracket warm a lot during normal use of the amply

There are other problems with the bracket?
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Old 1st July 2008, 11:19 AM   #6
AndrewT is online now AndrewT  Scotland
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Hi,
the clue is that the bracket got warm.

Remove it before you switch on again.

The bolt and the aluminium act like a single turn around the toroid and pulls enormous current making the bracket warm, but much worse it causes severe overheating of the primary and risks damaging the toroid beyond repair.

There must be numerous warnings about shorted turns in the Pass Labs section!!!
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Old 1st July 2008, 11:23 AM   #7
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AndreaFx,

The aluminium braket could lead to a shortcut!
If the bolt and braket on the top of the toroid are connected without insolation washers...

Nice job!

Regards.

Alain.
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Old 1st July 2008, 12:24 PM   #8
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Thanks guys for the information

The "shorted turn" can caused problem at the sound quality or only at the trasformer?

I use the rubber under the insolation washers on both sides of the trasformer.
I can use another rubber upon the washers?

would prefer not to cut the bracket........if possible!
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Old 1st July 2008, 03:35 PM   #9
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AndreaFx,


I understand your concern for handling the toroid weight.

If this is not creating a shortcut ; otherwise it could load the toroid real badly...

A shortcut of one turn of heavy aluminium and bolt would lead to

dozens of amps and could destroy the toroid...

Neoprene washers are fine, but they must wistand heat ; use the same
Neoprene as the big insolation washer sold with the toroid.


Regards.
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File Type: jpg toroidshort.jpg (26.0 KB, 1161 views)
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Old 1st July 2008, 03:41 PM   #10
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Ok Alain i try to do as you are suggesting, thank you
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