lm3886 beginners first project

jog · 26th May 2010, 03:55 PM

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

AndrewT · 26th May 2010, 04:07 PM

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.

jog · 26th May 2010, 10:26 PM

Thanks for your answer.
I probably go for 4ohm speakers I am not out for volume just comfortable listening level.

Rg.
jog

terranigma · 26th May 2010, 11:16 PM

Transformer specs should be far enough for home listening levels.

terranigma · 27th May 2010, 12:30 AM

Quote:

Originally Posted by terranigma

Transformer specs should be far enough for home listening levels.

I meant that in case of using 8 ohm speakers

jog · 27th May 2010, 11:34 AM

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.

jog · 2nd June 2010, 11:21 PM

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

panson_hk · 7th June 2010, 02:22 PM

Quote:

Originally Posted by jog

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?

semi932 · 7th June 2010, 06:30 PM

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.

jog · 8th June 2010, 12:32 AM

Quote:

Originally Posted by panson_hk

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.

26th May 2010, 03:55 PM	#1
jog diyAudio Member Join Date: Dec 2009 Location: Reykjavik	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

26th May 2010, 04:07 PM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	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. __________________ regards Andrew T.

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26th May 2010, 10:26 PM	#3
jog diyAudio Member Join Date: Dec 2009 Location: Reykjavik	Thanks for your answer. I probably go for 4ohm speakers I am not out for volume just comfortable listening level. Rg. jog

26th May 2010, 11:16 PM	#4
terranigma diyAudio Member Join Date: Feb 2007	Transformer specs should be far enough for home listening levels.

27th May 2010, 11:34 AM	#6
jog diyAudio Member Join Date: Dec 2009 Location: Reykjavik	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.

2nd June 2010, 11:21 PM	#7
jog diyAudio Member Join Date: Dec 2009 Location: Reykjavik	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

7th June 2010, 06:30 PM	#9
semi932 diyAudio Member Join Date: Nov 2009	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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