aleph 5 CLC filter

tomchaoda · 12th January 2004, 02:18 PM

I am about to place the Inductors (2x2.2 mH) in my Aleph 5 to form a pi filter. Few simple questions (as I am using this type the first time):

1. How should I place the Inductors (flat or raise up? Should their axle be parallel or perpendicular is fine?). I ask this, because my case is limited in space.

2. Should I isolate my Inductors to the chassis (I think I should, but is it requried?)

Thanks

Thomas

roddyama · 12th January 2004, 04:11 PM

You can mount them either way as long as you keep them away from the low level signals. They should be isolated from chassis.

Tyimo · 13th January 2004, 05:17 PM

Hi!
Another PSU question: need I use fuse between PSU and Amp board or it is not important? What kind of type and how big? ( slow blow, 4A? )
Thanks !

roddyama · 13th January 2004, 05:47 PM

This is a debatable subject. Myself, I wouldn't put a fuse in the DC line. I think it would become a noise source. There are those that have used fuses or breakers, and even relays, as I recall. The fuse size would be at least 3A per rail and 4A should be fine.

Tyimo · 14th January 2004, 05:29 PM

Thanks!
And what about with Main AC filter? Is it good or not?

roddyama · 14th January 2004, 08:22 PM

IMO anything that can clean up the input AC would help the amp to sound better. Although you may have a problem finding (or paying for) a line filter that will take the continuous 300W draw of an Aleph5 and live through the inrush current that will go to charging the PSU caps on power-up.

Tyimo · 15th January 2004, 04:30 PM

Thanks Roddyama!

dantwomey · 15th January 2004, 05:20 PM

Quote:

Originally posted by roddyama
IMO anything that can clean up the input AC would help the amp to sound better. Although you may have a problem finding (or paying for) a line filter that will take the continuous 300W draw of an Aleph5 and live through the inrush current that will go to charging the PSU caps on power-up.

When the topic of line filters comes up I've noticed lots of referrals to Jon Risch's DIY Line Filter.

Regards,
Dan

tomchaoda · 15th January 2004, 09:28 PM

If I wanted to test the filtering effect of either CLC or CRC, what Resistor value should I use? How can I calculate it?

One example I saw is using DALE 0.5R / 50W and another one I saw is 40R / 40W. This is a big difference!

Can anyone shed some light on this?

Thanks

Thomas

Blues · 17th January 2004, 01:49 AM

Depends on how much you'd like your final rail values would be. 0.5R would be less voltage drop compared to 40R. I think the effect of an R in a CRC filter is the increase in the discharge time of the capacitor, thereby decreasing the ripple. The L meanwhile in a CLC has 2 effects on the ripple with its dcR doing what an R does and inductance filling in the valley between the cap discharge and the next peak of the bridge signal. The inductor's degree of lag from the applied voltage depends on the value of the dcR.

12th January 2004, 02:18 PM	#1
tomchaoda diyAudio Member Join Date: Sep 2003 Location: New Jersey	aleph 5 CLC filter I am about to place the Inductors (2x2.2 mH) in my Aleph 5 to form a pi filter. Few simple questions (as I am using this type the first time): 1. How should I place the Inductors (flat or raise up? Should their axle be parallel or perpendicular is fine?). I ask this, because my case is limited in space. 2. Should I isolate my Inductors to the chassis (I think I should, but is it requried?) Thanks Thomas

12th January 2004, 04:11 PM	#2
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	You can mount them either way as long as you keep them away from the low level signals. They should be isolated from chassis. __________________ Rodd Yamashita

13th January 2004, 05:17 PM	#3
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	fuse Hi! Another PSU question: need I use fuse between PSU and Amp board or it is not important? What kind of type and how big? ( slow blow, 4A? ) Thanks !

13th January 2004, 05:47 PM	#4
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	This is a debatable subject. Myself, I wouldn't put a fuse in the DC line. I think it would become a noise source. There are those that have used fuses or breakers, and even relays, as I recall. The fuse size would be at least 3A per rail and 4A should be fine. __________________ Rodd Yamashita

14th January 2004, 08:22 PM	#6
roddyama diyAudio Moderator Emeritus Join Date: Jan 2002 Location: Michigan	IMO anything that can clean up the input AC would help the amp to sound better. Although you may have a problem finding (or paying for) a line filter that will take the continuous 300W draw of an Aleph5 and live through the inrush current that will go to charging the PSU caps on power-up. __________________ Rodd Yamashita


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14th January 2004, 05:29 PM	#5
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Thanks! And what about with Main AC filter? Is it good or not?

15th January 2004, 04:30 PM	#7
Tyimo diyAudio Member Join Date: Nov 2002 Location: Hungary	Thanks Roddyama!

15th January 2004, 09:28 PM	#9
tomchaoda diyAudio Member Join Date: Sep 2003 Location: New Jersey	Aleph 5 CRC Resistor value If I wanted to test the filtering effect of either CLC or CRC, what Resistor value should I use? How can I calculate it? One example I saw is using DALE 0.5R / 50W and another one I saw is 40R / 40W. This is a big difference! Can anyone shed some light on this? Thanks Thomas

17th January 2004, 01:49 AM	#10
Blues Lightning In A Bottle diyAudio Member Join Date: Sep 2003 Location: Bremerton, WA	Depends on how much you'd like your final rail values would be. 0.5R would be less voltage drop compared to 40R. I think the effect of an R in a CRC filter is the increase in the discharge time of the capacitor, thereby decreasing the ripple. The L meanwhile in a CLC has 2 effects on the ripple with its dcR doing what an R does and inductance filling in the valley between the cap discharge and the next peak of the bridge signal. The inductor's degree of lag from the applied voltage depends on the value of the dcR.

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