PSU Filter section question

mark02131 · 13th January 2011, 02:21 PM

What combination will give me a more clean and solid power supply

use (2) 2h chokes,1 8uf, (2) 100uf caps in a CLCLC configuration

or (1) 10h choke, 1 8uf, 1 100uf caps in a CLC configuration.

Thanks

mastodon · 02:44 PM

Simulate it using the Duncan Amps tool and see for yourself!
http://www.duncanamps.com/psud2/index.html

How much current are you going to draw from it? Important to take into account when designing your psu.

DigitalJunkie · 13th January 2011, 02:44 PM

Going on that limited info,I'm going to say option A.

mark02131 · 13th January 2011, 02:48 PM

The trans would be a 275-0-275, the current would be 140 ma at around 290-300 volts using a 5U4GB rectifier tube. The 2h chokes are 200ma.

I wish the Duncan amps tool worked on a Mac.

DF96 · 13th January 2011, 06:12 PM

The first one will have less hum and lower output impedance, partly because it has nearly twice as much capacitance.

Find a friend with a PC. Or use Spice. Or learn the maths and use a spreadsheet or calculator.

mastodon · 13th January 2011, 06:18 PM

According to Duncan Amp's PSUII, the CLCLC performs best:
The CLCLC (8uF, 2H, 100uF, 2H, 100uF) would result in 20mV ripple in a 140mA constant current load, with an output voltage of 312V.
The CLC (8uF, 10H, 100uF) would create 263mW ripple in the same load, with an output voltage of 321V.

I modelled the choke with a series resistance of 30R for both the 2H and the 10H chokes. Also note that in the model I used a 1n4007 bridge rectifier, so the output voltages would end up just about in your target range using a rectifier tube.

mark02131 · 13th January 2011, 06:50 PM

Thank You. I appreciate you doing that for me. I think I'm going to go with the CLCLC.
I have more room under the chassis for the smaller chokes than I do on top with a larger one anyway.

mastodon · 14th January 2011, 08:02 AM

You're welcome

Sounds like you have a solution then! Be sure to post back if the actual results are in line with the simulation.

13th January 2011, 02:21 PM	#1
mark02131 diyAudio Member Join Date: Nov 2005 Location: Boston, MA	PSU Filter section question What combination will give me a more clean and solid power supply use (2) 2h chokes,1 8uf, (2) 100uf caps in a CLCLC configuration or (1) 10h choke, 1 8uf, 1 100uf caps in a CLC configuration. Thanks

13th January 2011, 02:42 PM	#2
mastodon diyAudio Member Join Date: Jan 2011	Simulate it using the Duncan Amps tool and see for yourself! http://www.duncanamps.com/psud2/index.html How much current are you going to draw from it? Important to take into account when designing your psu. Last edited by mastodon; 13th January 2011 at 02:44 PM.

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13th January 2011, 02:44 PM	#3
DigitalJunkie diyAudio Member Join Date: Apr 2003 Location: Portland,Oregon Blog Entries: 4	Going on that limited info,I'm going to say option A.

13th January 2011, 02:48 PM	#4
mark02131 diyAudio Member Join Date: Nov 2005 Location: Boston, MA	The trans would be a 275-0-275, the current would be 140 ma at around 290-300 volts using a 5U4GB rectifier tube. The 2h chokes are 200ma. I wish the Duncan amps tool worked on a Mac.

13th January 2011, 06:12 PM	#5
DF96 diyAudio Member Join Date: May 2007	The first one will have less hum and lower output impedance, partly because it has nearly twice as much capacitance. Find a friend with a PC. Or use Spice. Or learn the maths and use a spreadsheet or calculator.

13th January 2011, 06:18 PM	#6
mastodon diyAudio Member Join Date: Jan 2011	According to Duncan Amp's PSUII, the CLCLC performs best: The CLCLC (8uF, 2H, 100uF, 2H, 100uF) would result in 20mV ripple in a 140mA constant current load, with an output voltage of 312V. The CLC (8uF, 10H, 100uF) would create 263mW ripple in the same load, with an output voltage of 321V. I modelled the choke with a series resistance of 30R for both the 2H and the 10H chokes. Also note that in the model I used a 1n4007 bridge rectifier, so the output voltages would end up just about in your target range using a rectifier tube.

13th January 2011, 06:50 PM	#7
mark02131 diyAudio Member Join Date: Nov 2005 Location: Boston, MA	Thank You. I appreciate you doing that for me. I think I'm going to go with the CLCLC. I have more room under the chassis for the smaller chokes than I do on top with a larger one anyway.

14th January 2011, 08:02 AM	#8
mastodon diyAudio Member Join Date: Jan 2011	You're welcome Sounds like you have a solution then! Be sure to post back if the actual results are in line with the simulation.

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