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Do you have VA connected to a supply?
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vladimirb0b wrote:VA and VD are different supplies with a common ground. The capacitance multiplier ramps up within a few seconds according to simulation and multimeter testing, as the most there is is a 47 ohm resistor between supply voltage and the capacitor. A few seconds is far too long. It should be a few tenths. Actually much less would be better. Edited by user Thursday, March 29, 2012 6:55:15 PM(UTC)
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Also VA and VD need to start in synch.
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VA is connected to a supply. However, there is almost no voltage at L2, L3, or L4. I'm far from an expert, but wouldn't this suggest a bad voltage regulator? It might matter to the DAC, but it shouldn't matter to the regulator how long it takes to come on.
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What is the measured voltage(running) at VA? Edited by user Thursday, March 29, 2012 7:04:56 PM(UTC)
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Thats with everything running?
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If your VD supply is capable of supplying the current try just connecting VD to VA and don't use the second supply.
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Does there appear to be a short to ground at VRA output with the power off?
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Why, yes there does. Resistance dips down to 1.3 Ohms but not stable due to moving voltmeter leads. Not on VRD, however. Edited by user Thursday, March 29, 2012 7:42:49 PM(UTC)
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Interesting, ok, well could be a shorted cap or load or a dead VREG.
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