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Old 1st November 2014, 08:37 AM   #381
Philfr is offline Philfr  France
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Join Date: Dec 2012
Hi,
Thank's for reply..
Just for info, I use 20/0/20 volts with the LM3875, and it's works well.
When you said : " the product R1 and a capacitance. 15 pf. It with R1 LPF filter."
That mean that resistor R1 have a capacitance of 15pF ?
Phil.

Last edited by Philfr; 1st November 2014 at 09:02 AM. Reason: missing
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Old 1st November 2014, 09:27 AM   #382
Flibble is offline Flibble  United Kingdom
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Location: Lancaster
Default Schematic?

If anyone has a schematic for the L7 they could post/pm/link I'd be really grateful. Have got one that I'd like to do some playing with

Regards, Dan
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Old 3rd November 2014, 05:11 AM   #383
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Max Woof View Post
Hi,
I am thinking to use 2 toroidal transformers, 34 volt 400VA each to drive 4 ohm speakers. From what I understand this should give me 48 volt rails, suggested for 4 ohm speakers. What do you think- is it a little too much or what ?
AC34-0-34 No problem.

Stereo as long as 200 va can satisfy the.

L15D Can work in very well 4 OHM.
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Old 3rd November 2014, 06:26 AM   #384
drahcir is offline drahcir  Philippines
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Quote:
Originally Posted by ljm_ljm View Post
AC34-0-34 No problem.

Stereo as long as 200 va can satisfy the.

L15D Can work in very well 4 OHM.
where we can get that aluminum casing?
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Old 6th November 2014, 06:21 AM   #385
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Philfr View Post
Hi,
Thank's for reply..
Just for info, I use 20/0/20 volts with the LM3875, and it's works well.
When you said : " the product R1 and a capacitance. 15 pf. It with R1 LPF filter."
That mean that resistor R1 have a capacitance of 15pF ?
Phil.
YES LM3886 There are input LPF 15 pf
3875 have is not
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Old 6th November 2014, 04:43 PM   #386
Philfr is offline Philfr  France
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Join Date: Dec 2012
Hi,
I don't understand..
Can you explain with more words ?
You would said that LM3886 have 15pF capacitance at input pin 10, and LM3875 have 0 pF capacitance at input pin 7 ?
Thank's.
Phil.
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Old 7th November 2014, 06:54 AM   #387
ljm_ljm is offline ljm_ljm  China
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Join Date: Sep 2006
Quote:
Originally Posted by Philfr View Post
Hi,
I don't understand..
Can you explain with more words ?
You would said that LM3886 have 15pF capacitance at input pin 10, and LM3875 have 0 pF capacitance at input pin 7 ?
Thank's.
Phil.
First of all,
LM3886,LM3875 Both the parameters of the chip is not the same. So the details of the circuit can't use the same circuit diagram.

In addition to the input filter. LM3886 boot quiet time delay function.

So we can't put the two chips. Together.

They're different in many places.
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Old 14th November 2014, 05:42 PM   #388
JUS is offline JUS  Germany
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Join Date: Jan 2014
Location: Germany, HB
Hello Ljm_Ljm
Please, can yon Post the wiring diagramm?
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Old 26th November 2014, 11:18 PM   #389
2channel is offline 2channel  New Zealand
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Join Date: Jul 2005
Location: Auckland, New Zealand
Default "Pro" model

I was about to purchase an L15D, then I noticed there is a "Pro" model which appears to have two switching Mosfets and speaker protection.

Does this protection eliminate turn off/on thumps? How much dc is required on the output to trip the relay? Is there any difference in performance between this model and the standard L15D?

I am using this amp to power a tweeter, so if the protection is not 100% then I will buy the standard model and get a protection circuit.

Thanks
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Old 29th November 2014, 02:20 PM   #390
ljm_ljm is offline ljm_ljm  China
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Quote:
Originally Posted by JUS View Post
Hello Ljm_Ljm
Please, can yon Post the wiring diagramm?

Of course. I have described in the above connection pictures. You have any questions .
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