Single sided non inverting LM3886 PCB - Page 3 - diyAudio
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Old 9th November 2008, 06:13 PM   #21
Ulew is offline Ulew  Sweden
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Sorry for bringing upp a rather old thread, but I have some questions! AndrewT said that one rectifier is not correctly shown, but whats wrong with it?
Those rectifiers aren't available in Sweden (haven't found them, anyway) so what kind can I use instead?
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Old 9th November 2008, 07:26 PM   #22
AndrewT is offline AndrewT  Scotland
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you haven't posted a layout, so who's are you referring to?
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Old 9th November 2008, 07:29 PM   #23
Ulew is offline Ulew  Sweden
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Quote:
Originally posted by AndrewT
you haven't posted a layout, so who's are you referring to?
The one the thread is about!
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Old 9th November 2008, 07:42 PM   #24
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AndrewT refered to the PSU in post 5, because dual rectifiers are used with a center-tapped transformer. They only make sense with a dual secondaries transformer.
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Old 9th November 2008, 07:53 PM   #25
Ulew is offline Ulew  Sweden
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Quote:
Originally posted by pacificblue
AndrewT refered to the PSU in post 5, because dual rectifiers are used with a center-tapped transformer. They only make sense with a dual secondaries transformer.
Ah, okay!
What about the rectifierbridge, what should I look for?
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Old 10th November 2008, 07:18 AM   #26
AndrewT is offline AndrewT  Scotland
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use the 4diode integrated rectifier bridge, available in the high current metal cased version or in lower current plastic cased and 4-in-line pins.
Alternatively, use To220 single diodes to construct a bridge
or use 1n5402/3/4 to create your own very cheap bridge.
Sugden use 8 off 1n5404 to charge +-20mF to +-75Vdc and I have never had a failure.
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Old 29th March 2009, 07:05 PM   #27
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Quote:
Originally posted by ArtiomR

But I think, there is one mistake in your schematic and PCB - R2 resistor should be connected between Cin and R1, so that they form a high pass filter
[/B]
Hi AndrewT,
is the schemetic originally posted by tla-Audio wrong, as mentioned??

Is this a good design for the lm3886??

I'm thinking of using it, any modification??
(would be using 18-0-18, 3A trans for each ch)

the schematic is attached here......
Attached Files
File Type: zip amp.zip (56.5 KB, 183 views)
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Old 29th March 2009, 08:17 PM   #28
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You could leave CIA away. CIB could become 47 F then.

You will have to recalculate Rm, if you use ~24 V DC rails. Should be 10..12 k then.
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Old 29th March 2009, 09:46 PM   #29
AndrewT is offline AndrewT  Scotland
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Hi,
compare that schematic to National's recommendations.

It has duplicated the RF input cap. 1n5F will probably take off too much treble. I reckon 1.5us is top limit.

Both Cs are wrong. They should include an electrolytic on each polarity and should connect together before going to Power Ground.

L1 should have a resistor in parallel to create the HF load. Somewhere between 2r7 and 10r.

Mute and GND should not share a trace with Signal Ground and NFB lower leg.
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Old 31st March 2009, 07:51 AM   #30
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Hi!

Quote:
Originally posted by AndrewT


It has duplicated the RF input cap. 1n5F will probably take off too much treble. I reckon 1.5us is top limit.

Sorry,didn't get it........once again please.



Quote:
Originally posted by AndrewT

Both Cs are wrong. They should include an electrolytic on each
polarity and ......

[/B]
what value electrolytic should I use??


please refer to the PSU schematic too (attached here)
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File Type: zip psu.zip (46.5 KB, 97 views)
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