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Old 2nd December 2017, 04:25 AM   #1
Hogwild is offline Hogwild  Canada
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Default Lm3886 dual monos-what size resistors?

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.

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Old 5th December 2017, 05:35 PM   #2
Hogwild is offline Hogwild  Canada
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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.
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Old 18th December 2017, 06:05 AM   #3
Mark Whitney is offline Mark Whitney  Netherlands
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Resistor tolerance on Chipamp.com LM3886 boards

Resistor tolerance on Chipamp.com LM3886 boards
Regards Mark.
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Old 5th April 2019, 08:14 PM   #4
tomchr is offline tomchr  Canada
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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.

Modulus-86, 186, 286, & 686: 40-240W (8Ω), <-120dB THD. HP-2 Headphone Amp: 660mW, <-130dB THD. Taming the LM3886.
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