PS Capacitance of Aleph X

lscangus · 5th February 2006, 10:46 AM

I am building an Aleph X with about 300W of power consumption. I am using 4 X 47000uf on my PS. will that be enoguh?

Angus

Netlist · 5th February 2006, 11:34 AM

It will work but as usual in Aleph amplifiers, more is better.
I used six of them in a CRCRC combination. R's are 0.1ohm.

/Hugo

lscangus · 5th February 2006, 12:11 PM

Quote:

Originally posted by Netlist
It will work but as usual in Aleph amplifiers, more is better.
I used six of them in a CRCRC combination. R's are 0.1ohm.

/Hugo

What is the difference when i add the resistor between it?

Netlist · 5th February 2006, 12:25 PM

From practice; you get a big reduction in ripple after every R and a small voltage drop. The smaller the resistor value, the smaller the voltage drop and the smaller the heat dissipation. When choosing bigger value resistors you start wasting too much power and need bigger resistors and heatsinks to cool them.
Not sure if a bigger value, say 0.5ohm has any effect on further decreasing ripple.

Theory is for other people.

/Hugo

jh6you · 5th February 2006, 12:38 PM

When R = 0.1 and C is 47,000uf,
Xc = 6.28 x 100 (50Hz) x 0.047 = 0.034
R+Xc = (0.1^2+0.034^2)^0.5 = 0.106

Ripple voltage attenuation = 20*log(0.034/0.106) = -10dB
So, better supply voltage regulation . . .

CRC = -10dB
CRCRC = -20dB

My calculation might be incorrect . . . anyhow, I am just trying to demonstrate how the ripple voltage could be reduced by the R . . .

Regards
jh

wuffwaff · 5th February 2006, 12:53 PM

Hi,

I´m using a CLC with 50000uF - 2.2mH - 100000uF per rail. This has even less ripple and doesn´t produce as much heat as resistors.

I´ve used intertechnik torobars and tested them up to 10A without getting into saturation.

William

lscangus · 5th February 2006, 01:07 PM

Quote:

Originally posted by wuffwaff
Hi,

I´m using a CLC with 50000uF - 2.2mH - 100000uF per rail. This has even less ripple and doesn´t produce as much heat as resistors.

I´ve used intertechnik torobars and tested them up to 10A without getting into saturation.

William

so less ripple current is better?

Netlist · 5th February 2006, 02:37 PM

Ripple translates in hum, which is exactly what we don't want to hear.

/Hugo

5th February 2006, 10:46 AM	#1
lscangus diyAudio Member Join Date: Oct 2005	PS Capacitance of Aleph X I am building an Aleph X with about 300W of power consumption. I am using 4 X 47000uf on my PS. will that be enoguh? Angus

5th February 2006, 12:53 PM	#6
wuffwaff diyAudio Member Join Date: Aug 2001 Location: Ingolstadt Germany	Hi, I´m using a CLC with 50000uF - 2.2mH - 100000uF per rail. This has even less ripple and doesn´t produce as much heat as resistors. I´ve used intertechnik torobars and tested them up to 10A without getting into saturation. William __________________ een ooievaar is geen konijn want zijn oren zijn te klein!

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5th February 2006, 11:34 AM	#2
Netlist diyAudio Moderator Join Date: Jan 2003	It will work but as usual in Aleph amplifiers, more is better. I used six of them in a CRCRC combination. R's are 0.1ohm. /Hugo

5th February 2006, 12:25 PM	#4
Netlist diyAudio Moderator Join Date: Jan 2003	From practice; you get a big reduction in ripple after every R and a small voltage drop. The smaller the resistor value, the smaller the voltage drop and the smaller the heat dissipation. When choosing bigger value resistors you start wasting too much power and need bigger resistors and heatsinks to cool them. Not sure if a bigger value, say 0.5ohm has any effect on further decreasing ripple. Theory is for other people. /Hugo

5th February 2006, 12:38 PM	#5
jh6you Account Disabled Join Date: Aug 2002 Location: Near to the Pacific Ocean	When R = 0.1 and C is 47,000uf, Xc = 6.28 x 100 (50Hz) x 0.047 = 0.034 R+Xc = (0.1^2+0.034^2)^0.5 = 0.106 Ripple voltage attenuation = 20*log(0.034/0.106) = -10dB So, better supply voltage regulation . . . CRC = -10dB CRCRC = -20dB My calculation might be incorrect . . . anyhow, I am just trying to demonstrate how the ripple voltage could be reduced by the R . . . Regards jh

5th February 2006, 02:37 PM	#8
Netlist diyAudio Moderator Join Date: Jan 2003	Ripple translates in hum, which is exactly what we don't want to hear. /Hugo

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