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Old 24th March 2013, 10:32 AM   #641
Bernie7 is offline Bernie7  Singapore
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Join Date: Dec 2008
Quote:
Originally Posted by jakv View Post

Therefor I tried to measure input/output with an oscilloscope, an learned that the L25D reverse the phase from input to output. Anyone else who has discovered this?
It's not a bug, but a feature of the IRS reference design. It was mentioned in an earlier post. I reversed the internal connections to my speaker posts for correct phasing.
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Old 3rd April 2013, 08:42 PM   #642
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I'm trying to decide which is the best psu board for L25D amp.
On ebay i can buy 68pcs 80v150uf matrix power supply kit: it's the best PSU?
And most important, for n.2 board L25D how many matrix power supply kit i need? How many 350w toroidal?
Which is the best/correct configuration?
1 toroidal + 1 matrix psu + 2 L25D
or
1 toroidal + 2 matrix psu + 2 L25D
or
1 toroidal + 1 matrix psu + 1 L25D
1 toroidal + 1 matrix psu + 1 L25D

Thank you every one helping me.
Pier
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Old 17th April 2013, 01:30 PM   #643
Mihkus is online now Mihkus  Estonia
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single 350VA would do fine for 2 boards, are you going to use your amps 24/7 at full power? are you kidding me?
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Old 17th April 2013, 02:59 PM   #644
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by nigelwright7557 View Post
Your inductor shouldn't get hot, I have a 750 watt amp that runs slightly warm all the time.
Which core did you use ?
I use a t106-2.

For inductance test I had done.
- 2 red ring inductor has the lowest heat, but it has the largest distortion.

Followed by iron silicon aluminum inductance, the best is 7 g17 series with minimal distortion, but it does have a fever. Especially in high power supply voltages.

Because it will filter out directly about the power supply voltage of the signal, the LPF in the absence of output continued to work in a larger current.

Although it can still be stable running, a lot of friends to use more than one year experience in different temperatures. But if increasing radiator, or join fan. It may be possible to raise more current allowance.
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Old 20th May 2013, 11:25 PM   #645
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Join Date: Feb 2013
Hi all,
thanks a lot for sharing your projects,

as many of you,
I just complete my L15D project, and as Peter, I have a hmmm issue, probably due to a ground loop.
Here is my config. and what I've done:
2 x Along L15D + 1 SMPS 500R
interconnects are good quality : ATLAS
speaker cables as well : QED
RCA plugs as well.
all other electric cables have isolation and good quality.
My speakers are good speakers: +90db Audax

RCA IN + -> Amplifier IN +
RCA IN - -> Amplifier IN -
Speaker+ -> Amplifier Speaker +
Speaker - -> Amplifier Speaker -
I link both speaker - to the PSU ground.

I've tried several config: both speaker - to PSU GND and then PSU GND to Amplifier GND -

I tried to completely unplug my RCAs from source as well as plug them to the DAC

I always have the hmmm issue.

I don't have this hmm issue if I unplug randomly one of the ALONG L15D (But I have this little hmm at 5cm to the speaker).

Any suggestions?
I red on a french forum someone who plug the - RCA to the ground... What do you think about it?

By advance, thank you for your help !
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Old 22nd May 2013, 06:56 AM   #646
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Join Date: Apr 2010
Location: Brisbane
Quote:
Originally Posted by camelator View Post
Hi all,
thanks a lot for sharing your projects,

as many of you,
I just complete my L15D project, and as Peter, I have a hmmm issue, probably due to a ground loop.
Here is my config. and what I've done:
2 x Along L15D + 1 SMPS 500R
interconnects are good quality : ATLAS
speaker cables as well : QED
RCA plugs as well.
all other electric cables have isolation and good quality.
My speakers are good speakers: +90db Audax

RCA IN + -> Amplifier IN +
RCA IN - -> Amplifier IN -
Speaker+ -> Amplifier Speaker +
Speaker - -> Amplifier Speaker -
I link both speaker - to the PSU ground.

I've tried several config: both speaker - to PSU GND and then PSU GND to Amplifier GND -

I tried to completely unplug my RCAs from source as well as plug them to the DAC

I always have the hmmm issue.

I don't have this hmm issue if I unplug randomly one of the ALONG L15D (But I have this little hmm at 5cm to the speaker).

Any suggestions?
I red on a french forum someone who plug the - RCA to the ground... What do you think about it?

By advance, thank you for your help !
Link your speaker minus to the star (PSU) ground only , not to the Ampifier speaker minus , leave these unconnected .
Make sure your RCA's are isolated from chassis .
Try to draw a schematic of your wiring and we can figure it out
little noise 5 cm's from speakers is normal with this amp .

Cheers ,

Rens
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Old 22nd May 2013, 11:00 AM   #647
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Join Date: Feb 2013
Hi,
Thank you for your reply,

unfortunately, it doesn't work.... The sound is different now,
I have a kind of engine 1944 Huricane noise instead.

What about other connections if I plug the - Speaker to the ground?

Or any other suggestions?

attached a schema of my prototype

Click the image to open in full size.

https://plus.google.com/u/0/photos/1...95517860776362
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Old 22nd May 2013, 11:03 AM   #648
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Join Date: Feb 2013
Sorry, if it is a double message, I can't read the first one:

hi,

thank you for your reply,

unfortunately, it doesn't work:
I have a kind of 1944 huricane engine instead.

What about the other connections with this solution?

Is there another way ?

Here my prototype:

https://plus.google.com/u/0/photos/1...95517860776362

Click the image to open in full size.
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Old 22nd May 2013, 11:25 AM   #649
diyAudio Member
 
Join Date: Apr 2010
Location: Brisbane
Quote:
Originally Posted by camelator View Post
Sorry, if it is a double message, I can't read the first one:

hi,

thank you for your reply,

unfortunately, it doesn't work:
I have a kind of 1944 huricane engine instead.

What about the other connections with this solution?

Is there another way ?

Here my prototype:

https://plus.google.com/u/0/photos/1...95517860776362

Click the image to open in full size.
In your schematic the minus of your speaker goes to the GND connection on the amp board , don't connect your speaker minus to the amp board but to the PSU star ground . Connect the amp board ground directly to the PSU star ground .

Cheers ,

Rens
__________________
If you measure, you know; if you guess, you don't
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Old 22nd May 2013, 11:33 AM   #650
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Join Date: Feb 2013
The schema I post was the schema BEFORE the test I've done.
The schema below reflects the changes.
With this configuration I have the "hurricane" sound.

https://plus.google.com/u/0/photos/1...95517860776362

Click the image to open in full size.
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