1,00,000uf total psu cap for good bass? - Page 2 - diyAudio
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Old 16th August 2012, 05:03 PM   #11
cbdb is offline cbdb  Canada
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Quote:
Originally Posted by Boscoe View Post
Simply people's subjective opinions are useless to determine small physical changes in circuitry however subjective opinions are very good to dictate what you enjoy! Saying that one cap is better than another on one setup is also ridiculous due to the almost infinite combinations of speaker that can be partnered with that amp.

Just interested, can you explain perhaps why this cap would be better?
Ditto. What electrical characteristics of the cap (eg ESL ) make a difference and how?
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Old 16th August 2012, 05:08 PM   #12
cbdb is offline cbdb  Canada
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Originally Posted by rhythmsandy View Post
I would like to use 100000uf of total caps for two channel amp with 2 x lm3886 per channel and expecting good bass out of it. Does the psu caps does punch bass?
There is a point of no extra return for the extra capacitance. The transformer is half the equation, if you double the capacitance you should also increase the transformer size.
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Old 16th August 2012, 05:14 PM   #13
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Quote:
Originally Posted by cbdb View Post
There is a point of no extra return for the extra capacitance. The transformer is half the equation, if you double the capacitance you should also increase the transformer size.
cbdb, if you have something to contribute to the amplifier power supply please join us on the thread http://www.diyaudio.com/forums/solid...voir-size.html
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Old 16th August 2012, 05:18 PM   #14
cbdb is offline cbdb  Canada
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I thought this was quite obvious, and the people on that thread are already aware of this.
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Old 16th August 2012, 05:36 PM   #15
AndrewT is offline AndrewT  Scotland
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Originally Posted by AndrewT View Post
Are we talking about 1F or 0.1F of PSU capacitance?
How many amplifiers are being fed?
What impedance of speakers are being fed?
What is the LF pass band frequency of the amplifiers?
I am asking the Thread opener, Rhythmsandy. So far no reply! Instead he posed another question.
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Old 16th August 2012, 06:29 PM   #16
bcmbob is offline bcmbob  United States
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Hey Boscoe

Take it for what you will - From Partsconexxion blurb:

***********

The Black (Titanium) Cathode coating is remarkably impressive at both measurements and music performance. The Titanium coating replaces the ordinary aluminum oxide coating (dielectric) in order to avoid the electrolyte being the cathode for the anode foil and, that the electrolyte operates as anode for the aluminum contact foil, simultaneously. Our Black Cathode electrolyte capacitor really does feature a separate cathode foil enabling super fast and almost loss free ion movement for reduced ESR, distortion and 'noise' to the utmost lowest level. These positive effects are similar to (but much stronger) graphite modified electrolytics (like Black-Gate).

With the MLytic® Audio Grade series we are extending our range of products to a series especially conceived for applications within pre-amplifiers or small power amplifiers.

The assemblage always refers to snap-in models for assembly boards.

Throughout its development, importance was placed upon attaining low ESR and ESL values, as well as, a low inner-sound development.

Specifications:

- Long lifespan

- All contacts welded

- Compact size

Technical specifications:

Temperature range: -40ºC... +85ºC
Max. reverse voltage: 2V
Leakage current 5 min. @ UR:0.007 * C [μF] * U [V] + 6mA
Leakage current 1 h @ UR: 0.15 * leakage current 5 min @UR
Specs.: DIN 41332 IEC 384 - 4
Insulation: Heat shrinkable tubing test voltage 3 2 500 VAC

************

My "subjective" analysis did include keeping all other parts of my system constant (including volume setting) for an accurate appraisal of the change. As in all manufacturing processes, I would suggest the base material quality and build techniques impact the operation of the item produced.

I am not disagreeing with you about the wide selection of caps or any other component in an audio system. As an example - on the MyRef there is an input cap named C13. I have auditioned 4 different brands of the same value and the two best were the cheapest ($6)and the most expensive (~$40). Go figure There are most likely several more to try over time which, IMHO is what makes DIYing fun.

Here's a link to a post about this subject (thouh not specific to power caps) that I believe supports both your and my views. I think we are generally in agreement. The new "My Ref" Rev C thread
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Last edited by bcmbob; 16th August 2012 at 06:48 PM.
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Old 16th August 2012, 06:38 PM   #17
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Quote:
Originally Posted by rhythmsandy View Post
I would like to use 100000uf of total caps for two channel amp with 2 x lm3886 per channel and expecting good bass out of it. Does the psu caps does punch bass?
The LM3886 can cope with 2200-4700 uF per rail and channel. Test it!
http://sjostromaudio.com/hifi_pics/h...0_overview.jpg
I get deep base with my QRP02 design. See the picture.
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Old 17th August 2012, 01:38 PM   #18
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hello rthythmsandy

if you saw a 4 amp rating on a cap then this is the maximum recommended ripple current thru the cap before bad things happen. it also indicates the maximum slew rate (maximum voltage change per unit time) for a given capacitance. capacitors do not store current/amps but rather electric charge across the plates which is translated into voltage depending on the capacitance.
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Old 17th August 2012, 02:41 PM   #19
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IMO, if an amp is overly sensitive to PS cap size, there's something wrong with the design. Bad topology, bad layout, poor choice of open loop gain and the amount of feedback or something. I expect a decent amp to have decent PSRR and if you divide the output and compare it to the input, the residual should be almost non-existent. I don't always achieve this, but increasing the PS caps to crazy values is a BandAid, a symptom of something else, not something to focus on in itself.
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Old 17th August 2012, 04:00 PM   #20
johnr66 is offline johnr66  United States
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I say experiment. Try the amp with only 470 uf! It should sound fine at lower volume, but when the output waveform hits the troughs of the supply waveform you get distortion. As long as the output swing works within to confines of the supply rail shape, there should be no adverse effects to the sound. In this condition negative feedback works to keep things in check.

If you want to have some fun, use the output of an amplifier to power another (rectified and a bit of filtering, of course).
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