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Old 4th June 2006, 07:22 PM   #1
kuldeep is offline kuldeep  India
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Cool 3 way active speaker system + Subwoofer based on Lm 3886 & 4780

Just started my dream project of 3 way active speaker system & Subwoofer based on LM3886 & LM4780 ICs .

Currently making the PCB for 3886.

kuldeep singh
http://geocities.com/go4ks/
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Old 4th June 2006, 09:34 PM   #2
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What drivers are you using for the project? I too have dreamed of building some active 3 ways with chip amps (if only I had the money!!!)
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Old 5th June 2006, 08:12 AM   #3
diarav is offline diarav  India
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Hi kuldeep,

I just completed making the PCB and the soldering on LM3886 amp based on the schematic from ESPs site.
Which schematic are you using for the LM3886?
Let me know once you complete the PCB and amp.

Thanks
Din
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Old 5th June 2006, 12:33 PM   #4
frank1 is offline frank1  United Kingdom
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If this is any interest to you, I have already built a 3way active speaker system.
I am just now building a 6 channel amp so I can get rid of the Quads that I currently use. I shall be using LM3886's in the mid and high channels and Rod Elliots P3a's in bridge mode for the lows. This is a sealed box design with Linkwitz transform to extend the f3 to 20Hz (which it does and sounds good too)
http://www.fdj.org.uk/loudspeakers
Note: Absolutely no subwoofer needed!
Frank
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Old 5th June 2006, 05:13 PM   #5
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GREAT Diyer you're.....watching ur site for the update enthusiastically...
Should one scratch the paint when it is wet or dry ?
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Old 6th June 2006, 02:56 PM   #6
kuldeep is offline kuldeep  India
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well PCB s r ready ..
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File Type: jpg pict000311.jpg (20.1 KB, 652 views)
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Old 6th June 2006, 04:01 PM   #7
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Kuldeep..are u aware of Laserprint >>iron tranfer technique in making PCB's ?
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Old 7th June 2006, 12:46 AM   #8
Wombat2 is offline Wombat2  Australia
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Great - I'm not the only one

For my fronts and rears I am useing a variation of Elliott's P03A for the bass, LM3876 for the mids and LM1875s for the highs.
The centre was going to be all LM3876s but I changed my mind and built 2 LM3876s and one LM1875 then changed my mind again and am putting together a reference circuit for the LM4781
mainly in the interests of space saving - all those boards take up a lot of room

My sub is Elliotts P68 driving a Shriva 12" in a 5 cft vented down firing enclosure - really rocks the house

Now that I've got my 625VA tranny I'm thinking of building a separate PSU and have one enclosure for preamps and Xovers and possibly the centre amps and one for all the rest.

Keep building
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Old 8th June 2006, 01:16 PM   #9
kuldeep is offline kuldeep  India
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hi guys...well pcb r ready and i have completed 3 amplifiers..but i have to go on 1 month office duty and will not be able to carry on the project upto one month...
anyhow i have uploaded the pcb layout and schematic on
http://geocities.com/go4ks

kuldeep


(laser - print - iron technique i tried many times but never got good results , sometimes pcb cracks, swells due to heat, sometimes transfer is not complete..but i was very satisfied by this method)
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Old 8th June 2006, 01:52 PM   #10
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Kuldeepji...My first attempt was successfull..i tried with glass epoxy +demat fotoprint glossy paper costing Rs=10/- per sheet locally..iron used was 1000watts in highest temperature ie Linen...
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