My First LM3886 GC
Hi guys, im using the Schematic that i found in the Datasheet of the LM3886, its how i draw it
and i draw the PCB using just one side in that way
can someone please tellme some tips about the Sch and PCB?
i dont know if can add something to the schematic to get it sound better.
or if can fix something in the PCB, im now on this :)
Thanks in advance
May I propose the attached PCB Layout..
I didn't built it myself... purchased local from an Indonesian supplier here.. but probably you could try to implement it...
It sounded really good... I'm using some Riken MetalFilm 0.5 Watt resistors and some Elna RE3 blue capacitors 1000 uF/50V (for power supply smoothing caps on C 9 and C 10).
And instead of placing 0.1uF MKM poly cap on C7 and C8 also installed additional Elna RE3 blue capacitors 1000 uF/50V on C7 and C 8 position and then putting the 0.1uF cap below of the PCB at the feet of these additional 1000uF caps...
hi dino i'm confuses about caps position on C3 at your picture attached!
that's show polar like + - - +
is it right position?
Yes..:D you are right..
I installed them back to back.. so it's become non polar (?)
But it does sound good...
u mean: - + , -+ ?
Nope... just follow the silk screen/top face of the PCB (the green one).. So the lay out will be + - - +
If you dont need the extra few watts,
if you can still get them, the Lm3875 in my OPINION has a much smoother sound than the 3886
btw i also have this pcb n still in progress
honestly i have 3-4 part that they included but not in pcb....
n i dont know how to install them
- C4: 47pF-50pF = that seems not in the pcb..
- C5,9,10: 100uF/50V = where i install this part? replace with 1000uf?
- R4, R6: ??
i will build LM3875 too, i wanna test diferents GC.
and want to build my own PCB in all the cases.
But i just dont know if the Datasheet schematic are the best choice, ir can be improved.
samsagaz. Build a simple gainclone first, get to know the pin layouts intimately. Then start to experiment with different resistor feedback values, cap values etc.
I have just spent the best part of 2 days trying to make my second bridged gainclone (first was with LM3886's, this time with LM3875's). No sound, then lots of noise, then no signal input, rebuilt the thing 5 times ! Just got it working and it sounds fantastic (of course) I can go and eat now !.
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