LM3886 Power supply
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 19th November 2009, 05:12 PM #21 livenicely   diyAudio Member   Join Date: Nov 2009 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.
 19th November 2009, 05:38 PM #22 piero7   diyAudio Member     Join Date: Apr 2009 Location: Matera 25 - 1 * 1.41 = 33
livenicely
diyAudio Member

Join Date: Nov 2009
Quote:
 Originally Posted by piero7 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

 19th November 2009, 11:04 PM #24 Minion   diyAudio Member   Join Date: May 2006 Location: Cowican Bay , vancouver island Its the AC Voltage (25v) x 1.41 =33vdc , then you loose something like 1.4v with the bridge rectifier ....
 24th March 2010, 07:23 AM #25 prabanjas   diyAudio Member   Join Date: Sep 2009 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.
 2nd June 2011, 03:18 AM #26 simply14prem   diyAudio Member   Join Date: Jan 2011 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.
 28th October 2014, 01:48 AM #27 Jimmy154   diyAudio Member     Join Date: Jun 2002 Location: NH, USA 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)? __________________
 28th October 2014, 04:55 AM #28 sangram   diyAudio Member   Join Date: Sep 2002 Location: India 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.
AndrewT
diyAudio Member

Join Date: Jul 2004
Location: Scottish Borders
A monoblock is the simplest.
It completely avoids channel to channel connections via the line level interconnects.
Quote:
 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.

veeds16
diyAudio Member

Join Date: Apr 2016
Location: Pune, India
Quote:
 Originally Posted by prabanjas 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.
You completed your 5.1 ?

Br
Ved

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