F5X -- the EUVL Approach
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 22nd November 2011, 12:57 AM #581 alazira   diyAudio Member     Join Date: Jun 2007 Location: Las Vegas So, if one went CRC, which is preferred? Tx 12V secondaries, C-0R12-C Tx 15V secondaries, C-0R68-C
 22nd November 2011, 02:39 AM #582 EUVL   diyAudio Member   Join Date: Oct 2003 I use R = 0R68 in combination with C = 44000uF. That gives a first order filter with a corner frequency of 5.3Hz. The ripples are at 100Hz fundamental. So the attenuation is about 19x. Using the same C with 0R12 gives a corner frequency 30Hz, or 3.3x ripple reduction. You can always increase C to compensate for that. As said in post#1, many way to skin a cat. Patrick __________________ xen-audio.com
AudioSan
diyAudio Member

Join Date: Feb 2009
Quote:
 Originally Posted by EUVL I use R = 0R68 in combination with C = 44000uF. That gives a first order filter with a corner frequency of 5.3Hz. The ripples are at 100Hz fundamental. So the attenuation is about 19x. Using the same C with 0R12 gives a corner frequency 30Hz, or 3.3x ripple reduction. You can always increase C to compensate for that. As said in post#1, many way to skin a cat. Patrick
what is the formula for calculating that?

 22nd November 2011, 04:17 AM #584 EUVL   diyAudio Member   Join Date: Oct 2003 Low Pass Filter Patrick __________________ xen-audio.com
 22nd November 2011, 05:08 AM #585 AudioSan   diyAudio Member   Join Date: Feb 2009 thanks
NicMac
diyAudio Member

Join Date: Feb 2009
Patrick,
I assume that the use of the C-R-C in place of the C-Reg-C, may benefit from better "C's". What caps do you suggest for this section of the circuit?
There are quite a few of these in the build (8/channel - I think) and maybe a GB would lower the cost very significantly. To match the rest of the build I would go for the best
Cheers,
Nic

Quote:
 Originally Posted by EUVL I use R = 0R68 in combination with C = 44000uF. That gives a first order filter with a corner frequency of 5.3Hz. The ripples are at 100Hz fundamental. So the attenuation is about 19x. Using the same C with 0R12 gives a corner frequency 30Hz, or 3.3x ripple reduction. You can always increase C to compensate for that. As said in post#1, many way to skin a cat. Patrick

 23rd November 2011, 12:05 AM #587 EUVL   diyAudio Member   Join Date: Oct 2003 The C's in both CRC and CRegC are the same on the same PCB. I think there has been extensive discussion about the possible choices at the old Balanced F5 thread. I do not have a real preference, and we use Panasonic 105°C snap-in electrolytics from Digikey for our proto. But anything from EPCOS (Siemens), Panasonic, BC Components, ... should be good. Maybe an additional MKP 2.2uF in parallel to the last C. I don't belong to the school of trying 20 different caps at every position of the circuit and decide by subjective impression which one has what signature. One of you would have to take over that task for me. Patrick __________________ xen-audio.com
 23rd November 2011, 12:14 AM #588 EUVL   diyAudio Member   Join Date: Oct 2003 Starting from here and lots of discussions that followed : Balanced F5 question Patrick __________________ xen-audio.com
 23rd November 2011, 12:19 AM #589 EUVL   diyAudio Member   Join Date: Oct 2003 A qualitative discussion of CRC vs CRegC : http://www.diyaudio.com/forums/group...ml#post2791748 See also : http://www.passdiy.com/pdf/zen-ver3.pdf Patrick __________________ xen-audio.com
 28th November 2011, 09:05 AM #590 Murdoc   diyAudio Member   Join Date: Nov 2010 Location: Sao Paulo Hi Patrick, why do you put 2.2uF in parallel to the last C, do you also have a formula or a rule of thumb for that? Kind regards, Matthias

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