LM3886 Power supply - Page 3

livenicely · 19th November 2009, 05:12 PM

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.

piero7 · 19th November 2009, 05:38 PM

25 - 1 * 1.41 = 33

livenicely · 19th November 2009, 06:12 PM

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

Minion · 19th November 2009, 11:04 PM

Its the AC Voltage (25v) x 1.41 =33vdc , then you loose something like 1.4v with the bridge rectifier ....

prabanjas · 24th March 2010, 07:23 AM

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.

simply14prem · 2nd June 2011, 03:18 AM

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.

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.

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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

19th November 2009, 11:04 PM	#24
Minion diyAudio Member Join Date: May 2006	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.