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Old 1st November 2011, 09:16 PM   #231
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I've just ordered a set of L25D's to power my 8R woofers and I'm building twin linear power supplies with a dual secondary 700VA transformer... Is there a point where supply capacitance would be considered overkill or perhaps even counterproductive? I have 40,000uF currently available for each board.
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Old 1st November 2011, 10:12 PM   #232
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There must be a point of diminishing returns for power supplys but I very much doubt it would be counter productive.

The L25D looks great! I'm still waiting for the resistors I need to change on my l20d's in order to make them run safely at about 85V.

@ ljm would I be able to change components on the L25D to make it suitable for this voltage as it looks very tempting!
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Old 1st November 2011, 10:25 PM   #233
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Quote:
Originally Posted by DarpMalone View Post
I've just ordered a set of L25D's to power my 8R woofers and I'm building twin linear power supplies with a dual secondary 700VA transformer... Is there a point where supply capacitance would be considered overkill or perhaps even counterproductive? I have 40,000uF currently available for each board.
Building a capacitance multiplier may be more effective cost- and space-wise.
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Old 2nd November 2011, 04:33 AM   #234
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Elliott Sound Products - Linear Power Supply Design

Srcoll down to the "Capacitor Value" section and give it a read.
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Old 16th November 2011, 04:32 AM   #235
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Hi ljm_ljm.

I just received my L25d kit... 4 zeners are still on the tape, 4 came individually. I'm not quite sure which zeners are the 5v and which are the 15v. Can you assist?

Thanks
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Old 16th November 2011, 02:55 PM   #236
MrSlim is offline MrSlim  Canada
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Quote:
Originally Posted by DarpMalone View Post
Hi ljm_ljm.

I just received my L25d kit... 4 zeners are still on the tape, 4 came individually. I'm not quite sure which zeners are the 5v and which are the 15v. Can you assist?

Thanks
check for markings.. (you might need a magnifier), he might not be able to tell you since he's the designer, and not involved with the sales..

If you have a power supply you can use, you can also measure the zener's to see which one's are which as per "Testing Zeners" on this page

Last edited by MrSlim; 16th November 2011 at 02:58 PM.
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Old 16th November 2011, 03:19 PM   #237
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by DarpMalone View Post
Hi ljm_ljm.

I just received my L25d kit... 4 zeners are still on the tape, 4 came individually. I'm not quite sure which zeners are the 5v and which are the 15v. Can you assist?

Thanks


4 zeners are still on the tape:Have the tape IS 5V6 .

4 came individually ,separate IS 15V.

Note of anode
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Old 16th November 2011, 03:37 PM   #238
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Great! That's all I have left to complete the boards.

Thanks to both of you!
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Old 20th November 2011, 12:13 AM   #239
zog666 is offline zog666  Australia
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Well, I finally got my L20D amplifier assembled and it's sounding good!

I am using a recycled DVD player chassis, and I haven't finished tidying the wiring yet, but here is where I am at:
Click the image to open in full size.

I'm using a ConnexElectronics SMPS300R, with 2 extra Elna 18000uF filter caps between them and the boards. I had originally ordered an A350SMPS, but it had a problem when I first tested it. Cristi offered to upgrade to an SMPS300R as a replacemant.. slightly less wattage, but made to provide +-60V to better suit the L20D, and its running very well.

The L20D boards are almost currently stock, except for the addition of heat sink compound (didn't ship with any, as others have said), and I have replaced the small stock bypass capacitors with 1200uF low ESR capacitors as well.

Only had it running for a few hours... but it sounds GOOD. Not as quiet as some amps, but more than quiet enough (hiss with ear near the waveguide, not audible away from the speakers). And this is all just as first fired up, with no fine tuning of the layout.

Power use for the pair of modules measured with steplight power meter is 12W idle.
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Old 20th November 2011, 01:05 AM   #240
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@ zog666 that looks like a sweet set up

Must admit during the short tests iv done these amps do sound good!

Running 86v rails

I have changed the components LJM suggested but the resistor next to the voltage regulator on the heat sink (changed from 2k2 to 3k 1 watt) runs very hot still.

maybe change to 2 or 3 watt?
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