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Old 22nd November 2011, 12:57 AM   #581
alazira is offline alazira  United States
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So, if one went CRC, which is preferred?
Tx 12V secondaries, C-0R12-C
Tx 15V secondaries, C-0R68-C
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Old 22nd November 2011, 02:39 AM   #582
EUVL is offline EUVL  Europe
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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
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Old 22nd November 2011, 03:57 AM   #583
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Quote:
Originally Posted by EUVL View Post
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?
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Old 22nd November 2011, 04:17 AM   #584
EUVL is offline EUVL  Europe
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Low Pass Filter

Patrick
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Old 22nd November 2011, 05:08 AM   #585
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thanks
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Old 22nd November 2011, 09:44 PM   #586
NicMac is offline NicMac  Italy
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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 View Post
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
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Old 23rd November 2011, 12:05 AM   #587
EUVL is offline EUVL  Europe
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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 105C 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
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Old 23rd November 2011, 12:14 AM   #588
EUVL is offline EUVL  Europe
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Starting from here and lots of discussions that followed :

Balanced F5 question


Patrick
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Old 23rd November 2011, 12:19 AM   #589
EUVL is offline EUVL  Europe
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A qualitative discussion of CRC vs CRegC :

Potential EUVL F5X designed case user distribution check

See also :

http://www.passdiy.com/pdf/zen-ver3.pdf


Patrick
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Old 28th November 2011, 09:05 AM   #590
Murdoc is offline Murdoc  Germany
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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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