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Old 19th November 2009, 06:12 PM   #21
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I have a transformer rating as (25-0-25) 5 Ampere. After full rectification how much proper dc i can get. i mean +25-0--25 or less. I have note that when we attach a load the voltages drope.
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Old 19th November 2009, 06:38 PM   #22
piero7 is offline piero7  Italy
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25 - 1 * 1.41 = 33
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Old 19th November 2009, 07:12 PM   #23
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Originally Posted by piero7 View Post
25 - 1 * 1.41 = 33
can u plz tell the details of this calculation i mean total 33 volt dc or it is 33-0--33 and how u calculate
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Old 20th November 2009, 12:04 AM   #24
Minion is offline Minion  Canada
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Its the AC Voltage (25v) x 1.41 =33vdc , then you loose something like 1.4v with the bridge rectifier ....
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Old 24th March 2010, 08:23 AM   #25
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I designed a home theatre 5.1, which has 5 lm3886 for surround and 2*lm3886 in parallel.

planned to use 20-0-20(5A) secondary to get 30w per channel for 5 channels(8ohm each)

24-0-24(5A) secondary for PA100 (4OHM SUBWOOFER). I need 100w rms

pls tell me how good this to get my expected output.
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Old 2nd June 2011, 04:18 AM   #26
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Default Lm3886, help needed.

I have modified a CT EI 18-0-18 into 2x24 dual secondary got around 29 v to 33v according to the ac mains supply.I use carlos snubberised unregulated psu.My Lm3886 is not producing any sound.Have tried various circuit but still same thing like it gets extremely hot,around 0.4v at the output .Do I really need a torroid or regulated psu.I can power an old 3055 amp from this psu but not lm3886 .Plz help me out .thanks.
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Old 28th October 2014, 02:48 AM   #27
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Is it better to use one or two transformers for a 4 channel amp?
Ideally I would like to use a 2 x 24V 650 VA transformers I have.
What should I be using for a 4 channel amp (8 ohm I think)?
i can't just tell you these things ... i give you a little bit and you taste it
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Old 28th October 2014, 05:55 AM   #28
sangram is offline sangram  India
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Dual stereo grounding arrangements are significantly more complicated than dual channel, who is in turn much more difficult to get right compared to dual mono. The issue originates in the ground loop created between the source and the amp power supply, in a dual mono there are none, in the stereo there is one and with two transformers there will be two such loops.
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Old 28th October 2014, 02:44 PM   #29
AndrewT is offline AndrewT  Scotland
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A monoblock is the simplest.
It completely avoids channel to channel connections via the line level interconnects.
in a dual mono there are none,
This is wrong.
The dual mono still has at least two interconnects and the far end of these usually have a commoned ground/return.

The more channels you incorporate inside the box the more complicated it becomes to minimise the hum loops.
regards Andrew T.
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