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Old 2nd July 2007, 08:11 PM   #2091
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Join Date: Feb 2004
Location: Recife - Brasil Northeast
Default You are welcome Microp...now you belong the the crew too


Anything you need...just call me....if i was out or busy, for sure Graham, Klaas, Usernamex, Charlie_fd, Greg, Nordic and other folks will help you for sure.

I am sorry....my memory is not so perfect...i know there are many others..i have to colect all those names and datas...i am having problems with "short time memory"... i am turning old (56).

I have to produce the Dx Crew Map.... with names and places.... i will do it soon.

Needing something, use my mail:

panzertoo@yahoo.com

I can arrange myself to understand Italian, French, Spanish and a little of English too.

You are welcome.

Now you belong to the crew!

Congratulations

Carlos
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Old 2nd July 2007, 08:19 PM   #2092
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Default I am extremelly happy to be in Rumania


Dx amplifier is sounding fine in Rumania.

Corporation is under Celebration this night!

Cheers!

Carlos
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Old 2nd July 2007, 08:22 PM   #2093
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Thanks, Graham for the suggestions and the help!
Very appreciated!

Ferrite beds on rails supply coming into transformers.
From what I know, it helps reducing EMI/RFI.

I'm not saying it will really show a difference in the sound,
but I think it is good practice still.
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Old 2nd July 2007, 08:24 PM   #2094
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Default Double celebration...now in Riga... Capital of Latvia, Letônia in my language


Nice...very nice...extremelly nice!


Yaaaaahoooooo!

regards,

Carlos
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Old 2nd July 2007, 08:32 PM   #2095
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Default You are welcome Microp.... enjoy Dx sonics


I hope it will bring much more happy days to you.

regards,

Carlos
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Old 2nd July 2007, 08:50 PM   #2096
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Hi Carlos,

That was a good misunderstanding.
Not having 800mA is real cool !

Hi usernamex,

>> Ferrite beds on rails supply coming into transformers.
From what I know, it helps reducing EMI/RFI. <<

Okay, now I see what you are thinking; to reduce supply noise.

Actually I think beads between transformer and bridge or even between mains and transformer could increase diode switching EMI.

To minimise rectifier generated noise (and they do generate a high frequency switching buzz) connect one 470nF to 1uF capacitor across each diode in the PSU bridge.

Also use a proper line filter between your mains cable and the transformer primary with its earth connected to the common ground. These enclose grounded L-C filters

I always use a line filter to cut out fridge clicks etc. and other mains switching noises.


Cheers ........ Graham.
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Old 2nd July 2007, 09:23 PM   #2097
Nordic is offline Nordic  South Africa
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Hate it when I can't remember a source, but I remember reading that there is little return in going higher than 22nf for those diode caps... suppose it has to do with tailoring the circuit to the actual frequency you are trying to drown out.
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Old 2nd July 2007, 09:54 PM   #2098
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Hi Nordic,

The value necessary is probably related to the AV rating of the transformer, the peak current draw, and whether the core is E-I / T-U or toroidal.

I checked this out for myself and would not choose to use less than 470nF on a wide bandwidth AF power amplifier.

I'm sure the source you read stated the merit of suppressing the diode switching transient though.

(Did the tooth come out okay ?)

Cheers ...... Graham.
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Old 2nd July 2007, 10:16 PM   #2099
Nordic is offline Nordic  South Africa
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Ok, thanks, yip, starting to heal slowly but surely.

It was clearly illustarted with the aid of scope traces...
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Old 3rd July 2007, 07:30 AM   #2100
microp is offline microp  Latvia
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Default Ok! Amp is still working beautiful :)

I would like to know how to calculate output power at 4 and 8 ohms

and how to know power supply suggested power. .....


Sorry for non long answers ... I am so excited I can't write... my brains

are cooked... need few days to rehabilitate.
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