2*100 watt @ 4ohm TK2050 or LM3886 Gain Clone?? - Page 2 - diyAudio
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Old 22nd April 2010, 08:01 PM   #11
fr1s is offline fr1s  Canada
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ohh ok thx
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Old 23rd April 2010, 06:13 AM   #12
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IMO I would go with the lm3886 as it will give you twice the clean power at 68 watts than the tri-path would at 35watts into 8 ohms.
The tri-path does 100watts at 10%thd which is not good.
If you feel the need for 100 watts then a bridged or parallel lm3886 will get you that while maintaining less < .1% to .01% thd.
10%thd at 100watts is just asking for blown tweeters and I would hate to see that happen to those nice polk monitors you have. jer
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Old 23rd April 2010, 06:21 AM   #13
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The tripath is more cost effective and simpler than a lm3886. that meanwell is really cheap and basically the cost of the toroidal you would need to buy.

But I agree with geraldfryjr that the lm3886 into 8 ohms will have higher volume with lower thd.
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Old 23rd April 2010, 06:32 AM   #14
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Oh yes!
I was impressed with the price but not by the spec's.
Also the lm3886 would be easier to tweak if needed not so true with switching amps. jer
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Old 23rd April 2010, 07:36 AM   #15
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Quote:
Originally Posted by fr1s View Post
I live in Canada so What Transformer do i need? voltage is 110 - 120v

110 - 120VA 25 0 25V ????

I would suggest 160 VA 25V 0 25V toroidal as a minimum.

But even better will be a 220VA 25 0 25 V toroidal.

Don't confuse your socket AC voltage(110V to 120V) with the power capability(VA) of the transformer.

You need a 110 - 120V 220VA 25V 0 25V toroidal transformer for that circuit.

Last edited by tangmonster; 23rd April 2010 at 07:39 AM.
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Old 23rd April 2010, 11:14 AM   #16
sendler is offline sendler  United States
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Default same power spec

Quote:
Originally Posted by geraldfryjr View Post
IMO I would go with the lm3886 as it will give you twice the clean power at 68 watts than the tri-path would at 35watts into 8 ohms.
Blown speakers? Please!

The power/distortion specs between the TK2050 and the 3886 are about the same for power output. From the 3886 datasheet:
.
The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4 load and 38W into 8 with 0.1% THD+N from 20Hz-20kHz.
.
The 3886 hits 10% distortion at 100 watts/4 ohms just the same. Every amp clips eventually.
.
http://www.national.com/ds/LM/LM3886.pdf
.
But we don't listen to specs. The sonics of a fully modified Sure 2X100 are in another league altogether. Much faster and more powerful sounding with better transparency and dynamics.
For a 3886, BPA200 with a true balanced source would be my minimum recommendation in order to get enough power, lower output impedance and bias current going in order to reveal the sonics that the chip is capable of.
.
There are better and more sophisticated class D amps with 4 times the power if you need that but the Sure 2X100 with a single MeanWell supply is right now the best bang for the buck diy amp by far.
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Old 23rd April 2010, 11:26 AM   #17
godfrey is offline godfrey  South Africa
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Quote:
Originally Posted by sendler View Post
The sonics of a fully modified Sure 2X100 are in another league altogether.
Hi Scott

What modifications are needed, and how does it sound un-modded?

Thanks - Godfrey
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Old 23rd April 2010, 11:29 AM   #18
AndrewT is offline AndrewT  Scotland
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Quote:
Originally Posted by sendler View Post
The power/distortion specs between the TK2050 and the 3886 are about the same for power output. From the 3886 datasheet:
.
The LM3886 is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4 load and 38W into 8 with 0.1% THD+N from 20Hz-20kHz.
.
The 3886 hits 10% distortion at 100 watts/4 ohms just the same.
Hi Sendler,
this is not a comparison. This is a deliberate misinterpretation of the specs to confuse the beginner and promote the digital type cause.
Tell the truth and learn to read the specifications, rather than spout your version of balderdash.
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Old 23rd April 2010, 11:38 AM   #19
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So The cooling fan on the meanwell powersupply and a cooling fan on the tk2050 bothers NOONE?

I suppose the fan on the tk2050 can be replaced with bigger heatsink?
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Old 23rd April 2010, 11:41 AM   #20
sendler is offline sendler  United States
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Default Sure 2X100 thread

Quote:
Originally Posted by godfrey View Post
Hi Scott

What modifications are needed, and how does it sound un-modded?

Thanks - Godfrey
Read all about it here.
Sure Electronics New Tripath Board tc2000+tp2050
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