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Old 9th January 2006, 04:09 PM   #1021
lgreen is offline lgreen  United States
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Default ces 2006

Quote:
Originally posted by jleaman
CES DAMNI* i want to go some day.. Some one better take pic's

I have taken pictures, see this thread
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Old 9th January 2006, 09:23 PM   #1022
joho is offline joho  Netherlands
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Thumbs up snubbers

Hi Nixie,

Thank you for the idee's.

Option 1 is not easy to do for this moment. In fact you should use a potted transformer.
Option 2 is no option because i already build the amps. It's no point of discussion that a seperate (raw)power supply is better,
but practical ...

Option 3 is "easy" to do. I read the snubber article of Jim Hagerman with great interest and i will try it.

B.t.w. i use two full wave bridges with HFA25PB60(ultrafast soft recovery) rectifiers. Some guy's use a rc snubber of 100R+100N parallel.
Maybe that's a good start?
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Old 9th January 2006, 09:29 PM   #1023
Netlist is offline Netlist  Belgium
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Nice and solid looking amp. You really paid much attention to the bridge. Where are the outputs? We need more pictures, for sure in the passdiy gallery.

/Hugo
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Old 9th January 2006, 09:58 PM   #1024
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Default snubbers

Hi Guys

Theese are really exelent.
http://www.evoxrifa.com/cap_catalog/...en_info_rc.pdf
http://www.evoxrifa.com/europe/specs_rc_caps.htm
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Old 11th January 2006, 06:48 PM   #1025
joho is offline joho  Netherlands
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Default Snubbers+pictures

Hi Hugo,

The pictures were already posted in a other thread. In fact this is a better place.

"Start me up..." AlephX with relais control and powermanagement.

The evox rifa caps shoud be excellent but this weekend i will try something from my "junk box". If there is any result i order rifa's.

Gr.
Johan.
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Old 15th January 2006, 09:01 PM   #1026
joho is offline joho  Netherlands
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Hi Gents,

Last saturday i tried snubber filters around the bridge rectifiers but it had NO influence on the small hum at the output of my ax's.

I'm afraid i must live with it.
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Old 16th January 2006, 03:23 AM   #1027
lgreen is offline lgreen  United States
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Default question

I'm using triple the # of output devices on my A-X.

I see that some resistors need to be triplicated off board as well. Which ones need to be (a) off board, and (b) triplicated?

- thanks
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Old 16th January 2006, 03:48 AM   #1028
Nixie is offline Nixie  Canada
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joho, don't put the snubbers around the rectifiers. Read the actual link I posted on the previous page; an RC or RC+C snubber should be across the secondary. Also, it's best to use a scope to find the right part values, unless you know the actual values of transformer's parasitic reactances and can use the formulas to calculate them.
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Old 16th January 2006, 01:22 PM   #1029
joho is offline joho  Netherlands
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Question snubbering again

Hi Nixie,

I didn't interpret the positioning of the rc-snubber on this way.
I read the article again and i suppose with "secondary" you mean one rc or rc+c across the output of the bridge(between + and -)?

Johan.
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Old 16th January 2006, 07:57 PM   #1030
Nixie is offline Nixie  Canada
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No, it's an RC, or RC and a C across the secondary of the transformer, before the rectifiers.
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