I have been running the DDA-100 continuously for two days hoping it would 'open up'. As you saw, there also was no big coupling cap in the PSU. I did not remove the shield since there was none.
#Pizzicato psu free
Obviously manufacturers are free to make changes in production but it seems to me that my unit is a 'stripped-down' version. He also noticed "immediate differences in the SMPS section between the pictures you published and the DDA-100 I received. That was a reader who'd bought a DDA-100 on 30-day return privilege before my review finalized. So the stream is I²S to 32-bit digital filter and volume control to Delta Sigma conversion." "The digital volume control for the DAC-100 happens right inside the 32-bit digital filter prior to analog conversion. The remote control for this unit switches sequentially between the four inputs but doesn't turn the smooth volume control which lacks a motor. There are also two socketed LM 4562 op amps and four International Rectifier regulators. The clock here is a Silicon Labs 552CH000230G. What appears to be the actual DAC chip is defaced to conceal its identity. Here we see another AKM chip, this time an AK4118AEQ 24/192 transceiver and also a Microchip PIC16F1939 f lash-based 8-Bit CMOS chip. The main processor is a Xilinx Spartan field-programmable gate array. The associated clock reads H12.000MA2 on its casing. The USB transceiver chip is again NuForce branded and here identified as NFUSB192S 12W13 to signify 192kHz happiness. There's a Xilinx processor integrated into the input switching board with the sample-rate indicator display. It has a mother board with piggybacked USB transceiver board, a toroidal power transformer behind a metal shield, a power supply board with 17 capacitors and four seriously heat-sinked voltage regulators of LM2941T type.
The DAC-100 is trimmed out in a copper-plated chassis Marantz reference style. This review page is supported in part by the sponsors whose ad banners are displayed below
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