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.
- For the Buffalo-IIISE, should the IVY-III resistors R32-R35 be omitted?
- 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?
My mistake about SW1. Not dip-switches but a relay to mute the single-ended output until to voltages are established.
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.
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.
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.
Hi,
is it possible to buy the Buffalo IIIse DAC just as a kit, to save some cents?
Many thanks, tom
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.
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?
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?
Make sure you are not starved for current at VD.
Also double check that you have all of the regs in the right spot and well soldered.
The funny thing is it seems to be working perfectly, and it is regulating- the output is a little high at 3.4V, but pretty close.
Anyway I ordered a replacement, nice that spares are available.
Question Russ/Brian; the U.FL connector for the master clock - I'm thinking about using Ian's FIFO for the I2S stream, with it driving the ESS synchronously. When playing DSD (these two will be switched via Otto), will Buffalo III-SE use it's clock as Master? Put another way - will Buffalo use the clock signal if provided, else fall back to its own clock?
No - you need to use one or the other. The simplest solution if you wish to use an external clock is to not install the supply for the clock (trident).
Grounding issues
What is recommended vis-a-via power supply output grounds vs. chassis ground? Should the analog ground float or have back-to-back diodes to chassis ground?
What is recommended vis-a-via power supply output grounds vs. chassis ground? Should the analog ground float or have back-to-back diodes to chassis ground?
Largely up to you.
I usually float the analog ground and isolate it from the chassis.
if I use a metal chassis I always connect it to mains ground/earth.
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