LM3886, XO, Buffer and Servo - diyAudio
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Old 28th October 2008, 04:19 PM   #1
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Location: Llanddewi Brefi, NJ
Default LM3886, XO, Buffer and Servo

A la Linkwitz -- this is a first cut at a PCB with the XO, servo and phase adjustment incorporated:

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Old 28th October 2008, 05:05 PM   #2
infinia is offline infinia  United States
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Hi Jack

Like how you think i.e. PowerAmp with it's own 4th order Bandbass X'os.

Grounding scheme? How about 2 returns with no Gnd plane!
opamps....OPA duals or quads?

Group Buy?
like four million tons of hydrogen exploding on the sun
like the whisper of the termites building castles in the dust
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Old 28th October 2008, 05:17 PM   #3
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I have no ground-plane drawn in (poured).

I would like to use a Quad -- problem is finding one which isn't SMT -- the LME49743 is TSSOP, the OPA4134 is SOIC...it's a DIY after all...perhaps the OPA4134 on a Aries carrier, and others building it could choose a more conventional quad opamp like the LT1014.

I have to put another header in so that you can elect inverting or non-inverting for the first stage.
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Old 30th October 2008, 12:14 AM   #4
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I did a similar thing, back when I was green (well BRIGHT green, I'm still green, but fading to brown ). Details here. Mine did not have anything fancy, just the capacity for HP and LP filters, a buffer and the LM3886 on each board.
Original intent was more hifi, but they have been reassigned to a pair of 3-way workshop speakers. Not that they sound bad - they are fixed at ~310Hz and 3100Hz leaving no room for adjustment and they are not quite powerful enough.
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