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Old 12th January 2007, 11:20 AM   #1
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Default lm3886 psu

i am about to begin building a lm3886 amp, and wondered what transformer would be appropriate for my application.

i will be using this to drive 8 ohm paradigm atoms (89db), and would like to only use only one transformer to begin with to keep costs and complexity down.

dual secondary transformers seem to be rather hard to locate, so i would ideally like to use something that will work with just one of the avel transformers i can easily order from parts express.

i would very much appreciate any of your opinions/suggestions. thanks.



-oh, and also, i was planning on using a 50k pot for volume. is this an appropriate value?
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Old 12th January 2007, 11:21 AM   #2
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These questions have been answered many,many times before. Did you search before posting?
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Old 12th January 2007, 11:58 AM   #3
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yes, i have searched, but i cannot seem to find an answer to this. i cannot find anything that uses a single transformer without dual secondaries.
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Old 12th January 2007, 12:14 PM   #4
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I´ve always used a single transformer within my stereo LM3886 amps. Of course it has dual secondaries, witch are necessary for split or dual power supply.
With a single secondary you need a different 'single supply' circuit. So have to change the layout etc. I won´t recommend it until you are more experienced.
But there´s no problem at all.
Transformers with dual secondaries are standard and easy to find.
I wonder if things overseas are that different.
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Old 12th January 2007, 12:17 PM   #5
Nordic is offline Nordic  South Africa
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And now the PSU hmm...
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Old 12th January 2007, 01:23 PM   #6
BrianGT is offline BrianGT  United States
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I am using an Avel Lindberg 330va 2x25vac transformer for powering my LM3886 amp. (stereo configuration).

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Old 12th January 2007, 01:37 PM   #7
Nordic is offline Nordic  South Africa
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Are those nice...? got a 2 x 20V 15VAx2 one on the market the other day for like 2 dollars,might use it in my preamp, as I only have a 12v supply a.t.m.
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Old 12th January 2007, 08:20 PM   #8
MikeW is offline MikeW  United States
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This will work fine.
http://www.partsexpress.com/pe/showd...number=122-615
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Old 12th January 2007, 11:24 PM   #9
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Quote:
Originally posted by pinkmouse
These questions have been answered many,many times before. Did you search before posting?
I really think this site is superb... except the search feature.

I've never seen such a poorly executed search function, especially when the I search for a specific term and it returns the first page of a 147 page thread. Really doesn't do me any good.
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Old 13th January 2007, 06:13 AM   #10
BrianGT is offline BrianGT  United States
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Quote:
Originally posted by shallbehealed


I really think this site is superb... except the search feature.

I've never seen such a poorly executed search function, especially when the I search for a specific term and it returns the first page of a 147 page thread. Really doesn't do me any good.
If you use the "Show results as posts" option in the Search Options section, it should help you find the relevant posts in long threads.

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