FYI and future reference
"Dear Jorgen,
This model already over 15 years old, I checked the computer , only leave a web page file but no other .
I send it to you in the attached.
Kingwa"
Audio-gd Dac 17:
"
Best musical D/A chip SAA7350!
Technical Features of DAC17
1. Digital & Analog / Left & Right Completely Separated Inner Layout.
2. The HDAM inner circuit output analog part. After a long-term experiment and improvement, this decoder achieves an even better sound quality than the original circuit. Pure copper shield box is also used on the D/A converter and output analog part to provide a more purified music background.
3. DAC-17 guarantees truly balanced differential output. Each channel adopts a piece of SAA7350 PHILIPS bitstream chip SAA7350 that is recognized to deliver the best musical flavor so as to achieve a 21 Bit conversion precision. The inner operation on SAA7350 chip eliminates the inner analog circuit and replaces it with transistor circuit in the periphery. By doing so, the sound quality is improved dramatically.
The application of multi-differential structure effectively offsets noise and distortion before they reach the output port. Even under unbalanced output, two pieces of DAC chips can also been fully utilized to ensure a good sound quality.
4. DAC-17 applies three high-speed complementary electrolytic capacitors with total power of 150W and total amount up to 55,000 UF to do the filter (such a large capacity exceeds many so called high-end power amplifiers). Two-stage cascade parallel stable voltage also effectively provides a pure power supply and decreases the internal resistance of the power.
The cost and area of the power section both exceed 60% of the whole. Such an emphasis on power source is still scarce in domestic market, but it is the key to success for all the imported high-end products. A better parallel stabilized voltage supply not only brings a more purified power output, but also a even more enchanting timbre.
5. Transformer and rectifying tube are both shielded, which effectively decreases the clutter interference from the transformer and the radio-frequency interference from the rectifying tube.
6.The whole DAC is sealed by WBT.
7. To achieve the best performance of DAC-17, heavyweight pure aluminum alloy machine box is used to prevent the eddy current of transformer from interfering on circuit board. The upper plate and under plate of the box are both made from aluminum alloy which is 5MM thick, the lateral plate 8MM and the face plate up to 12MM. The net weight of the box is 8KG. Moreover, the inner part is separated into 4 sections by 5MM aluminum boards, which eliminates the interference among the circuits.
8. High accuracy components are used to guarantee the accuracy of balanced output.
9. DAC-17 can output truly balanced two-channel signal (Canon), ordinary RCA output. It applies to any sound system, with both BNC and RCA coaxial input. However, the time base flutter under BNC input is about ten times lower under ordinary RCA input and that enables a more clear and transparent sound.
Overall Net Weight: approx 15Kg"