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Old 27th November 2012, 12:02 AM   #161
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Placid HD setup is identical to the positive side of the Placid HD-BP.
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Last edited by Russ White; 27th November 2012 at 12:05 AM.
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Old 27th November 2012, 10:32 PM   #162
lhquam is offline lhquam  United States
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I just started assembling boards for my Buffalo-IIISE and have a couple of questions related to the IVY-III board whose manual hasn't been updated recently.

  1. For the Buffalo-IIISE, should the IVY-III resistors R32-R35 be omitted?
  2. On the IVY-III board, what are the functions of SW1.1, SW1.2, and SW1.3? According to the schematic, SW1.1 enables a 1K resistor between +15V3 and -15V3. I suspect it should be left open. SW1.2 and SW1.3 short the outputs of the differential to single-ended amplifiers. When would you want to do that?
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Old 28th November 2012, 04:30 AM   #163
lhquam is offline lhquam  United States
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My mistake about SW1. Not dip-switches but a relay to mute the single-ended output until to voltages are established.

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Originally Posted by lhquam View Post
I just started assembling boards for my Buffalo-IIISE and have a couple of questions related to the IVY-III board whose manual hasn't been updated recently.

  1. For the Buffalo-IIISE, should the IVY-III resistors R32-R35 be omitted?
  2. On the IVY-III board, what are the functions of SW1.1, SW1.2, and SW1.3? According to the schematic, SW1.1 enables a 1K resistor between +15V3 and -15V3. I suspect it should be left open. SW1.2 and SW1.3 short the outputs of the differential to single-ended amplifiers. When would you want to do that?
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Old 29th November 2012, 04:16 PM   #164
lhquam is offline lhquam  United States
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Can anyone comment on whether a chassis for the Buffalo-IIISE with IVY-III and power supplies needs vent slots or holes for heat removal?
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Old 29th November 2012, 04:19 PM   #165
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Can anyone comment on whether a chassis for the Buffalo-IIISE with IVY-III and power supplies needs vent slots or holes for heat removal?
It's a good idea. Since the Trident regulators are shunts, they generate heat by their nature. If you are using shunt pre-regulators, such as Placids, you will get a lot of heat from them as well.
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Old 29th November 2012, 04:42 PM   #166
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Quote:
Originally Posted by lhquam View Post
I just started assembling boards for my Buffalo-IIISE and have a couple of questions related to the IVY-III board whose manual hasn't been updated recently.

  1. For the Buffalo-IIISE, should the IVY-III resistors R32-R35 be omitted?
There is no harm in installing them, but they are really only needed if you are using the V_IN terminals, such as with the Opus DAC.

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  1. On the IVY-III board, what are the functions of SW1.1, SW1.2, and SW1.3? According to the schematic, SW1.1 enables a 1K resistor between +15V3 and -15V3. I suspect it should be left open. SW1.2 and SW1.3 short the outputs of the differential to single-ended amplifiers. When would you want to do that?
The relay is there to prevent thumps on the outputs. The 1K resistor starves current from the coil of the relay to cause it to close before the rail voltages collapse to the rest of the circuit.
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Old 29th November 2012, 05:20 PM   #167
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Hi,

is it possible to buy the Buffalo IIIse DAC just as a kit, to save some cents?

Many thanks, tom
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Old 29th November 2012, 06:16 PM   #168
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Hi,

is it possible to buy the Buffalo IIIse DAC just as a kit, to save some cents?

Many thanks, tom
No, only as a assembled module. It would be too much work/support to offer it as a kit.
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Old 2nd December 2012, 08:51 AM   #169
supra is offline supra  Australia
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Finished my buff3se and very happy with it, very high quality kit and sound.
I noticed the led's on XDD-XO Trident board aren't lighting up. Reg is working ok ,input 5.25V , output 3.4V. Is this normal?
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Old 2nd December 2012, 09:03 AM   #170
avr300 is offline avr300  Denmark
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No, its not normal.
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