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Old 26th May 2010, 03:55 PM   #1
jog is offline jog  Iceland
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Default lm3886 beginners first project

Hi guys. I am new at this hobby and have bought from ebay this kit here
LM3886 Hi-End AMP DIY KIT component 68W components NEW - eBay (item 260425032471 end time Jun-03-10 02:06:43 PDT)

Now I consider this transformer here
MULTICOMP|VTX-146-225-118|TRANSFORMER, 225VA, 2 X 18V | Farnell United Kingdom

Do you guys think this should work ok ?

Regards
jog
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Old 26th May 2010, 04:07 PM   #2
AndrewT is offline AndrewT  Scotland
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That transformer is perfect for 4ohm speaker duty.
It would also do for 6 & 8 ohm duty but just not quite as loud.

It does seem a little expensive for a 225VA. Note: it is a 230:18+18Vac
On 240Vac it will give ~20.1Vac when open circuit.
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Old 26th May 2010, 10:26 PM   #3
jog is offline jog  Iceland
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Thanks for your answer.
I probably go for 4ohm speakers I am not out for volume just comfortable listening level.

Rg.
jog
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Old 26th May 2010, 11:16 PM   #4
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Transformer specs should be far enough for home listening levels.
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Old 27th May 2010, 12:30 AM   #5
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Quote:
Originally Posted by terranigma View Post
Transformer specs should be far enough for home listening levels.
I meant that in case of using 8 ohm speakers
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Old 27th May 2010, 11:34 AM   #6
jog is offline jog  Iceland
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Ok.
Then I suppose I can have te flexibility of using either 4ohm or 8 ohm but 8 ohm would be somewhat lower in volume or watts.
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Old 2nd June 2010, 11:21 PM   #7
jog is offline jog  Iceland
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Now I got my amp up and running. Transformer is 225va with two 25v secondaries. My speakers are 30year old Technics 8ohm. The sound is above my expectations bright and warm. Bass is comfortable and natural. Works very nice on jazz. Next thing is to build a housing for the unit and I must build a preamp for my LP player. Any suggestions regarding a simple preamp?

reg jog
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Old 7th June 2010, 02:22 PM   #8
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Quote:
Originally Posted by jog View Post
Now I got my amp up and running. Transformer is 225va with two 25v secondaries. My speakers are 30year old Technics 8ohm. The sound is above my expectations bright and warm. Bass is comfortable and natural. Works very nice on jazz. Next thing is to build a housing for the unit and I must build a preamp for my LP player. Any suggestions regarding a simple preamp?

reg jog
Are you using MM or MC cartridge? You looking for a kit?
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Old 7th June 2010, 06:30 PM   #9
semi932 is offline semi932  United States
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Something simple like a passive attenuator could be a solution.
Just a good volume control in line. Very clean sounding.
Won't help the phono situation, though.
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Old 8th June 2010, 12:32 AM   #10
jog is offline jog  Iceland
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Quote:
Originally Posted by panson_hk View Post
Are you using MM or MC cartridge? You looking for a kit?
I am using a MM. Looking for a kit or a simple preamp to build from scratch.
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