Aleph-X builder's thread. - Page 103

lgreen · 9th January 2006, 04:09 PM

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

joho · 9th January 2006, 09:23 PM

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?

Netlist · 9th January 2006, 09:29 PM

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

analogair · 9th January 2006, 09:58 PM

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

joho · 11th January 2006, 06:48 PM

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.

joho · 15th January 2006, 09:01 PM

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.

lgreen · 16th January 2006, 03:23 AM

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

Nixie · 16th January 2006, 03:48 AM

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.

joho · 16th January 2006, 01:22 PM

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.

Nixie · 16th January 2006, 07:57 PM

No, it's an RC, or RC and a C across the secondary of the transformer, before the rectifiers.

9th January 2006, 09:58 PM	#1024
analogair diyAudio Member Join Date: Jan 2005 Location: Denmark	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 __________________ air is analog

11th January 2006, 06:48 PM	#1025
joho diyAudio Member Join Date: Jul 2003 Location: Sliedrecht Z-H	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.

16th January 2006, 03:23 AM	#1027
lgreen diyAudio Member Join Date: May 2003 Location: San Diego, USA	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

16th January 2006, 01:22 PM	#1029
joho diyAudio Member Join Date: Jul 2003 Location: Sliedrecht Z-H	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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9th January 2006, 09:29 PM	#1023
Netlist diyAudio Moderator Join Date: Jan 2003	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

15th January 2006, 09:01 PM	#1026
joho diyAudio Member Join Date: Jul 2003 Location: Sliedrecht Z-H	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.

16th January 2006, 03:48 AM	#1028
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	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.

16th January 2006, 07:57 PM	#1030
Nixie Banned Join Date: Jan 2006 Location: Vancouver, BC	No, it's an RC, or RC and a C across the secondary of the transformer, before the rectifiers.

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