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Old 17th July 2012, 07:57 PM   #491
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Join Date: Jan 2012
Hi
I have bought the l20d and ordered the Connex SMPS 800r aux 12 power supply. Now i am considering connecting a pair of VU meters to make my amp glow in the dark. Do you think it is possible use this from ebay: 2Pcs VU Panel Meter Warm Back Light + VU Driver PCB Board Stereo For Audio Amp | eBay ?

Thank u in advance :-)
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Old 18th July 2012, 02:10 PM   #492
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Hi guys,

reading the thread a long time I decided to build another L25D-amp. Cause just waiting for another SMPS from Christi, I got some time for optimizations. I decided for the SMPS800RE this time. Which components of the L25D should be replaced to get a better result?
It would be nice to summerize a sheet with all optimizations, so anybode has a overwiev what is possible by replacing which component.

Many thanks,

Stammheim
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Old 20th July 2012, 12:52 PM   #493
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Hey guys...

No idea or are you all gone for another amp???

Br,

Stammheim
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Old 22nd July 2012, 01:24 PM   #494
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Location: Quezon City
Quote:
Originally Posted by jlester87 View Post
Does this have a built in over current protection? Anyone tried shorting speaker outputs?(either intentionally or accidentally)
Hi LJM, Reposting my question...
Do I have to add over current protection?
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Old 22nd July 2012, 01:27 PM   #495
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Location: Quezon City
Here's my L25D running at +-53VDC, resistors adjusted to accommodate this voltage.

(Thin wires of second channel and amp layout are just temporary)
Click the image to open in full size.

Very good sound stage and airy sound, but the treble/high sound is a bit dry. I think I might need to upgrade the input cap and add a tube buffer to achieve sweet sounding highs...

Last edited by jlester87; 22nd July 2012 at 01:29 PM.
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Old 24th July 2012, 09:02 PM   #496
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Hey...

nothing to optimize?
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Old 2nd August 2012, 03:15 PM   #497
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Location: Brisbane
Quote:
Originally Posted by Stammheim View Post
Hey...

nothing to optimize?
Hi Stammheim ,

I changed the input capacitors ( of my L15D's ) with Silmic II's 22 uF/50V and increased the buffer caps to Panasonics 820uF/63V ( wich will fit on the PCB) Rs partno. 571521, wich should be fine with your rail voltage .
The difference is not huge but it's there . Highs are a little bit more sparkling and some more punch in the mid lows.
I'm loving these amps ,together with my Emotiva UMC-1 and 5 Tannoys and the (regulated) powersupply (A1000SMPS) from Connexelectronics it is a superb combination .I have a couple of much more expensive amplifiers , but did only listen to the LJM's for the last month because overall they sound the best .

Cheers ,

Rens
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Old 2nd August 2012, 03:26 PM   #498
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Location: Brisbane
Sorry just read the messages again and was assuming you where using 53 volt rail voltage , ( jlester87 ) so forget about the Panasonics .

Cheers ,

Rens
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Old 2nd August 2012, 03:42 PM   #499
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I actually think I am going to change out basically anything in the signal path except for the inductor at the output, since I am already modding my boards to accommodate 35V +/-

This list will include:
CP1 - 22uF
R2 - 330R
R7 - 3k01
C4 - 1nF
C6 - 1nF

I will probably follow doctordata's example and use Elna Silmics at the input. Would it be dangerous to put a film bypass paralleled with CP1, assuming I can find a way to fit it?

I may also swap the 470uF 100V caps for higher value, lower voltage, since they only need to handle 35V each. A nice 50V or 63V variety (also per doctordata) would work, correct? EDIT: as long as it is no more than 16mm wide

Last edited by blairfrischx; 2nd August 2012 at 04:01 PM.
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Old 2nd August 2012, 05:52 PM   #500
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Actually, I might just swap out all of the 22uF 25V caps while I am at it with Elna Silmics. There are six per board. I may also order some 22nF MKP caps to parallel across CP1 on each board.

I will have to check when I get home whether the buffer caps in the L20D are actually 470uF 100V (per reference design) or 100uF 80V (per board markings). I think I will sub them with 470uF 50V Nichicon KZ caps.

I can't seem to find a good replacement for the 1nF ceramic caps (C2,C4,C6,C7) since they are so small, so I may just leave them in place. I was trying to find a comparable WIMA cap, but they all seem to be much too large.

R2 and R7 will probably be swapped with 1% Vishay/Dale resistors of the appropriate values.
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