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Lm3886 dual monos-what size resistors?

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Hogwild

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Joined 2010
#1
Hi everyone:

Well, this is embarassing. I was all ready to solder in the replacement resistors I'd mentioned in another thread (Rs, Rf, R3, and mute resistor), into my Chipamp.com LM3886 boards, when I discovered I bought the wrong replacements.
I bought 1/4W for R2, Rf and R3, but they're too big.

Can anyone tell me What wattage/physical size are the resistors in those locations by default. Yet another thing that is not in the Chipamp.com manual.

Thanks.
 
#2
Okay, it appears that the original resistors were between 3.0 and 3.25mm long. I'm guessing from that size, and the cost of the kit, that they were 1/4 W.

I'm gonna replace them with 1/2 W units that are closer to 3.5mm wide.
 
#4
The resistors around an LM3886 can be 250 mW or 400 mW types. The only two that need to be higher power are the resistor in the Zobel network (R+C from the output to ground) and in the Thiele network (L||R in series with the output). Those two resistors need to be 2 W types. I don't recall if the chipamp.com boards have Zobel or Thiele networks.

Tom
 
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