Capacitance Multiplier Power Supply

Redshift187 · 6th January 2009, 02:19 PM

Has anyone here ever attempted to build a "Capacitance Multiplier Power Supply"? I was reading about it here:
http://sound.westhost.com/project15.htm

Note that while the title says for Class-A, it discusses using for Class-AB as well.

Looks very interesting, and not too difficult to build.

AndrewT · 6th January 2009, 05:33 PM

some builders who have adopted the multiplier recommend and other say it interferes with the sound.

It will not cost much to try but expect to have to undo it.

A conventional Transformer + rectifier + smoothing is hard to beat.
Great with ClassAB (low hum at quiescent state). Great when asked to deliver lots of power, and can withstand enormous overload when the operator does something wrong.

mjf · 6th January 2009, 07:55 PM

hello.
there was a thread: 70w class a amp on jan. 02 ,a few days ago.that amp uses one.
i think it is a simplified version of a simple discrete voltageregulator - without a zenerdiode.
once an amp began to oscillate -that was the only problem i ever had with it.
greetings..........

Kinnja · 7th January 2009, 06:06 PM

Quote:

Originally posted by Redshift187
Has anyone here ever attempted to build a "Capacitance Multiplier Power Supply"? I was reading about it here:
http://sound.westhost.com/project15.htm

Note that while the title says for Class-A, it discusses using for Class-AB as well.

Looks very interesting, and not too difficult to build.

Yes, I built a variation of it.

Post #41 of this thread has the schematic of it
Class A Mosfet Amplifier and PS

Here is a link to a pic
http://diyaudioprojects.com/Gallery/...album=4&pos=22

As recommended, its laid out just like the schematic

I don't have the background to make any audiophile comparisons, or technical comments, but it sounds good to me. I'm using it in a Class A amp that get listened to weekly. I enjoy it.

EchoWars · 15th January 2009, 12:42 PM

The only way I was able to get rid of the hum in a Elliot DoZ amp was to build a cap multiplier. But, I think they may not be a good choice for a Class aB amp...the variations in the load mean that there will be a lot of power wasted in the pass transistor of the multipler. Try to reduce the wasted power and you run the risk of sucking the multiplier dry with heavy loads.

The cap multiplier is a cool idea for Class A use, but a problem with Class aB.

Redshift187 · 15th January 2009, 01:34 PM

Thanks for all your input. Makes sense that it wouldn't work as well for AB amps. I've had great luck with the basic unregulated supply, so I'll stick with that for now.

6th January 2009, 02:19 PM	#1
Redshift187 diyAudio Member Join Date: Aug 2008	Capacitance Multiplier Power Supply Has anyone here ever attempted to build a "Capacitance Multiplier Power Supply"? I was reading about it here: http://sound.westhost.com/project15.htm Note that while the title says for Class-A, it discusses using for Class-AB as well. Looks very interesting, and not too difficult to build.

6th January 2009, 05:33 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	some builders who have adopted the multiplier recommend and other say it interferes with the sound. It will not cost much to try but expect to have to undo it. A conventional Transformer + rectifier + smoothing is hard to beat. Great with ClassAB (low hum at quiescent state). Great when asked to deliver lots of power, and can withstand enormous overload when the operator does something wrong. __________________ regards Andrew T.

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6th January 2009, 07:55 PM	#3
mjf diyAudio Member Join Date: Jan 2009 Location: upper austria/near linz	hello. there was a thread: 70w class a amp on jan. 02 ,a few days ago.that amp uses one. i think it is a simplified version of a simple discrete voltageregulator - without a zenerdiode. once an amp began to oscillate -that was the only problem i ever had with it. greetings..........

15th January 2009, 12:42 PM	#5
EchoWars diyAudio Member Join Date: Dec 2002 Location: Left of the Dial	The only way I was able to get rid of the hum in a Elliot DoZ amp was to build a cap multiplier. But, I think they may not be a good choice for a Class aB amp...the variations in the load mean that there will be a lot of power wasted in the pass transistor of the multipler. Try to reduce the wasted power and you run the risk of sucking the multiplier dry with heavy loads. The cap multiplier is a cool idea for Class A use, but a problem with Class aB.

15th January 2009, 01:34 PM	#6
Redshift187 diyAudio Member Join Date: Aug 2008	Thanks for all your input. Makes sense that it wouldn't work as well for AB amps. I've had great luck with the basic unregulated supply, so I'll stick with that for now.

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