LM3886 Schematics + PCB

[shravanth]

Apex sir what is the Transformer rating for 2 channel LM3886 and AX-14

 

[csom]

Two more babies took birth today.


My second amp for passive X over.

14700 uFd per rail with a 23-0-23 VAC 4 amp transformer.

And I had to thank Respected Mr Mile and Mr AndrewT again when they started singing beautifully.

 

[AndrewT]

Lots of twisting well done.
Short cable runs, good.

 

[csom]

Lots of twisting well done.
Short cable runs, good.

Thank you Sire!

 

[csom]

One quick question guys. The PCB n the first post, should be printed just as it is, or should it be mirrored for transferring it to copper?

Since it has text and it's not mirrored, I suppose I should mirror it so it'd then be readable once transferred (and by extension the design usable), but I'm almost certain I'm wrong... My mind doesn't work that well this late in the night.

Hi Vod..
The pcb layout in the first post should be mirrored before printing.

 

[vodka]

Thank you very much csom, but after a good night of sleep, I managed to figure it out on my own Confirmation is very welcome, too!

If everything goes right, next week I'll be showing you guys the finished boards. I wanted to thank Apex for sharing such a nice little PCB for us to rock all day long and to satisfy our soldering needs.

 

[LazaKamikaza]

All done!

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An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

An externally hosted image should be here but it was not working when we last tested it.

Finally got around to building it and it's done! Mr Mile, i have already made a PCB for your preamp with TL074, could you tell me what transformer do I need, 12-0-12 or 15-0-15 and should 2x250mA be sufficient, or do I need more or less? Thanks!

 

[martin martinez]

Very cool! nice and pro-
LazaKamikasa whwt transformer did you use?

i saw there are two transformers...

 

[LazaKamikaza]

Thanks! The torus is 200VA 2x24V for the actual amp, and the small one is just 1A 9V I had laying around for the fans.

 

[apexaudio]

Thanks! The torus is 200VA 2x24V for the actual amp, and the small one is just 1A 9V I had laying around for the fans.

Nice work but wrong resistor 4k7/2W must be replaced with 4R7/2W. Use 2x15V 250mA transformer for preamp.
Regards

 

[ridelperez34]

Sir Mile can i use the soft start circuit of these lm3886 to lm4780? if not, what are the values of resistor, capacitor and zener are neede to replace to use in lm4780 mute function as soft start? Thanks Mile.

 

[Rendraraconkota]

i have some chip LM3886. can you help me to guide for assembling GC stereo audiowith lm3886...
and i need the scematic and layout inverting..
thanks..

 

[gootee]

i have some chip LM3886. can you help me to guide for assembling GC stereo audiowith lm3886...
and i need the scematic and layout inverting..
thanks..

That information has all been posted, already. Search and read.

 

[Rendraraconkota]

inverting mode????

 

[gootee]

diyAudio - Search Results

 

[ridelperez34]

Sir Mile can i use the soft start circuit of these lm3886 to lm4780? if not, what are the values of resistor, capacitor and zener are neede to replace to use in lm4780 mute function as soft start? Thanks Mile.

Any body wants to answer this query?

 

[mrWagner]

In some way you are soft starting the trafo+psu caps. Not only the chip.
What differences do you have in the circuit? trafo+psu caps?

 

[udailey]

LM4780=2xLM3886 so use same values.

 

[ridelperez34]

Mrwagner,
i followed the data sheet recommendation ckt for ti (the revised).

udailey,
Thanks! that's all i need.

God bless you two!

 

[Rendraraconkota]

mr.mile
you have scematic grounding/star grounding to lm3886??