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Juma's Easy-Peasy Capacitance Multiplier
Juma's Easy-Peasy Capacitance Multiplier
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Old 14th October 2018, 02:31 PM   #581
e_fortier is online now e_fortier  Canada
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Juma's Easy-Peasy Capacitance Multiplier
Quote:
Originally Posted by xrk971 View Post
I am only using a pair of 10,000uF caps per cap Mx to smooth out the bridges. Compare that to my previous F6 PSU which required qnty 8 x 33,000uF caps. These Mark Johnson cap Mx are very cost effective as the major expense in the PSU was the capacitors before.
Hi X

You are right, it’s economical to use a Mx, it does an amazing job for filtering since it’s SIMULATING a huge capacitor bank.

How does the Mx behave when there is a huge sudden demand of power from the supply ? I know a REAL capacitor banks will do a great job.

Have you done some test and heard any differences ?

Thanks for sharing your experience

BR
Eric
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Old 14th October 2018, 04:44 PM   #582
Mark Johnson is offline Mark Johnson  United States
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Juma's Easy-Peasy Capacitance Multiplier
Eric, take a look back at post #555. It'll jog your memory, that member xrk971 is using a pair of "Capacitance Multiplier" boards in the power supply path of his FirstWatt M2 amplifier. M2 operates 100% in Class-A which makes it an especially easy load.

Nelson Pass set the M2's output stage DC bias point at 1.3 amps (per channel), using his optocoupler feedback scheme from long ago. Patent granted June 1988 (!).
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Old 14th October 2018, 05:06 PM   #583
e_fortier is online now e_fortier  Canada
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Juma's Easy-Peasy Capacitance Multiplier
So X hasn’t compared the 8 x 33000uF to this Cap Mx ?
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Old 14th October 2018, 10:04 PM   #584
xrk971 is offline xrk971  United States
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Juma's Easy-Peasy Capacitance Multiplier
Yes, I have compared it to the 8x 33mF CRCRC and for Class A, it is better. Class A has a steady draw of the same current no matter what. So for Class AB, you want the big cap bank to provide the reserves of current. But on M2, the Mark Johnson cap Mx sounds better to me than the 8 big 33mF caps. You get -50dB ripple filtering so it is very quiet. The stereo separation and imaging is also superior since I am using two cap Mx with one trafo. The cap Mx’s essentially isolate the rails from each other so there is no channel crosstalk.
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Old 14th October 2018, 10:18 PM   #585
e_fortier is online now e_fortier  Canada
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Juma's Easy-Peasy Capacitance Multiplier
Thank you very much for your detailled answer.
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Old 15th October 2018, 12:54 AM   #586
Mark Johnson is offline Mark Johnson  United States
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Juma's Easy-Peasy Capacitance Multiplier
It's pretty instructive to calculate the output impedance (vs frequency) of the two alternatives. ESR and ESL of the Big Old Bohunker Capacitor Bank prevent it from delivering all of the goodness that an ideal perfect "university chalkboard capacitor" would give you, in theory. While the "Capacitance Multiplier" benefits tremendously from high bias Class-A downstream circuits, and from modern power transistors with high fT. Crank the algebra, or run the sim. It'll be fun.
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Old 15th October 2018, 11:46 AM   #587
schillg11 is online now schillg11  Germany
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Quote:
Originally Posted by prasi View Post
It could be due to jlcpcb software for / rendering of gerbers may be faulty or there is a bug in the online viewer.

I would believe manufactured PCBs rather than some online viewer.
Like I said before, gerberlogix is quite mature and gives correct view of layers. My experience.
Regards
Prasi
Hi prasi,
this morning i received an email from Sophia, with the answer all is ok with your files. The bug must be on their online viewer, and internally they check the designs with gerbv 2.6.2.
Usually the offered online viewer from JLCPCB should work, because when sending files for production, i don't like to start discussion with them.

i like the straight way
Create files- check them, send them , produce PCB and receive PCB.

BR
GŁnni
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Old Yesterday, 07:12 PM   #588
kpsthakur is offline kpsthakur  India
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Hello All, is there a version for center tapped 3 input transformer AC-0-AC as well
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