Finished capacitance multiplier

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metallicus69

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Joined 2005
PMI said:
I did not realize the ALF was already isolated, so I just used the same plastic shoulder washer everywhere. I think I will take that out now, the Alfets should have a good tight connection. I have seen that ground circuit on Rod's web site, I normally use almost the same ground scheme but w. discrete diodes.

Very interesting about the transformer!

I have seen similar transformers used in some medical instruments to reduce the magnetic field to essentially zero, but they are usually lower power, and too expensive for diy projects. I have a semi-custom transformer from the recent "Primrose" GB, but it has a mechanical hum, so I am using it just for testing the PSU right now. (Post 487 above)
Click to expand...

Mine was not too expensive, I paid less than 200EUR for 2 trafo's like that, shipping included from PL to NL. More detailed description is here.

Of course shipping to U.S. is prohibitive in this case, because of size and weight, but I am sure you can find similar products around you.
 
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metallicus69

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Joined 2005
It works!!! it sounds GORGEOUS! It was so difficult to stop it to be able to mount the indicators and the top cover!
As mentioned in the main thread as well, i am thrilled by the silence it "provides" to the loudspeakers. With the cap multiplier set to approx 600mV drop, the ripple present on the huge caps is totally vanished at the circuit power supply input points. Many thanks for making this public Mr.Evil and PMI for adapting it to VSSA. I guess it can be the secret weapon. i am tempted to see how it sounds without it, but ...hell... who can stop this beast singing? :D :D :D

Of course, I will now have a reference for my future build, the balanced one. Not decided yet about the primal supply (trafo or SMPS) but I will use for sure this wonderful Cap multiplier.

Cheers!
 
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PMI

Member
Joined 2013
metallicus69 said:
It works!!! it sounds GORGEOUS! It was so difficult to stop it to be able to mount the indicators and the top cover!
As mentioned in the main thread as well, i am thrilled by the silence it "provides" to the loudspeakers. With the cap multiplier set to approx 600mV drop, the ripple present on the huge caps is totally vanished at the circuit power supply input points. Many thanks for making this public Mr.Evil and PMI for adapting it to VSSA. I guess it can be the secret weapon. i am tempted to see how it sounds without it, but ...hell... who can stop this beast singing? :D :D :D

Of course, I will now have a reference for my future build, the balanced one. Not decided yet about the primal supply (trafo or SMPS) but I will use for sure this wonderful Cap multiplier.

Cheers!
Click to expand...
I am very happy to hear that, :)
(and quite envious of that Pre Build!)
 
P

PMI

Member
Joined 2013
Single-Layer Layout

One version of the layout that I hope is suitable for etching is attached below.

I have actually made a couple other versions on request, but so far there has not been much feedback, and I do not normally etch boards at home... In other words, until someone else provides a little feedback, please use at your own discretion.

I believe this version is the easiest to etch, and almost identical to the 2-layer circuit board. One of the optional ground connections has been dropped, and one jumper added, to keep the other components in the same locations.

I am also posting pics of the two-layer, and the single layer version side-by-side for comparison.

@Idefixes: If you are reading this, please review and comment, since I believe you have both versions (?). Thanks.
 

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P

PMI

Member
Joined 2013
AndrewT said:
You have 11 tappings into the Ground trace between the two sets of big caps.
This must contravene the rule: do not share a trace with different currents.
Click to expand...
Thanks for the comment. It probably does violate that rule, but the performance does not seem to be affected, to the best of my ability to hear, or to look for the noise on the output with a 100 MHz scope. Can you possibly suggest a test I can do, other than looking for noise on a scope, or listening? Any noise on the rails is below what I can measure.

In the beginning did have a version with five different ground traces, but they were not very wide, and I anticipated there might be other issues if I made the grounding scheme more complicated. I originally experimented with having a separate return for the filter circuit ground on one rail, leaving the grounds for the other rail common. I could not tell a difference.
 
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