LM3886, XO, Buffer and Servo - diyAudio
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Old 28th October 2008, 04:19 PM   #1
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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
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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?


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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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