Has anyone looked at ARC's decoupled electrolytic capacitor Patent? i'm curious if anyone else has ever experimented with this sort of thing? is this just hocus pocus or is there something to this?
I cant attach a direct link but if you go to ARCDB - The Audio Research Database - The unofficial & unauthorized source for ARC information and under the ARC tab at the top there is a patent's section. scroll all the way down to the bottom and read the patent.
I cant attach a direct link but if you go to ARCDB - The Audio Research Database - The unofficial & unauthorized source for ARC information and under the ARC tab at the top there is a patent's section. scroll all the way down to the bottom and read the patent.
Well, no rocket science as usual, but at least no complete B*S$ either.
Here is a direct link
Patent US5036292 - Decoupled electrolytic capacitor - Google Patents
The results of doubling a large cap with a small one are well known by people familiar with these problems, but the vast majority simply continues to bypass any lytic with a 100nF, and for those, such an innovation is probably a great step forward: it is ready-made, and has the gloss of a" patented technology".
Search this forum for this kind of topic, I have posted a number of actual measurements.
the inductor is not in series with the lytic, it is shunting the electrolytic.
Looks like a basic LC resonant circuit... with a resistor to lower the Q.
Fig 3 for example.
Of course it will work only over a relatively narrow range, then it gives way to being a simple RC...
Patented, eh?
_-_-bear
Looks like a basic LC resonant circuit... with a resistor to lower the Q.
Fig 3 for example.
Of course it will work only over a relatively narrow range, then it gives way to being a simple RC...
Patented, eh?
_-_-bear
"A filter capacitor network includes an inductor connected in series with an aluminum electrolytic capacitor with the inductor and aluminum electrolytic capacitor bypassed with a capacitor having relatively better high frequency performance characteristics than the aluminum electrolytic capacitor."
if you look at this schematic it shows an R in parallel with the L and that network is in series with the lytic. each lytic in the filter bank gets an R/L combo and the whole bank is then bypassed.
I cant upload the url to the pic..
http://www.arcdb.ws/Patents/5036292/5036292-1.gif
I cant upload the url to the pic..
http://www.arcdb.ws/Patents/5036292/5036292-1.gif
With properly chosen values, it can improve the overall behavior of the composite.
It is better than simply paralleling the caps without any precaution.
The effects of such a paralleling can be seen here:
http://www.diyaudio.com/forums/powe...lm-caps-electrolytic-caps-17.html#post2257381
With adequate values, it can shave off ~20dB of the nasty parallel resonance peak (the most troublesome).
Note that the values of this example are rather preposterous; within the scope of the patent, one can certainly do much better.
It is better than simply paralleling the caps without any precaution.
The effects of such a paralleling can be seen here:
http://www.diyaudio.com/forums/powe...lm-caps-electrolytic-caps-17.html#post2257381
With adequate values, it can shave off ~20dB of the nasty parallel resonance peak (the most troublesome).
Note that the values of this example are rather preposterous; within the scope of the patent, one can certainly do much better.
Attachments
Solid=amplitude, dotted=phase
100µ // with 10n, without (red) and with patent (green)
_-_-
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