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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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Digital Drive Upsamplers, DACs, jitter, shakes and analogue withdrawals, this is it. |
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In Reply to: CI VDA-1 digital de-emphasis is now working! posted by MB on January 3, 2003 at 18:57:44:
Original:DIR1701 Emphasis Flag, EMFLG (Pin 17) -> N/C
PCM1716 DM1, Gnd --> DM1 (Pin 27) (one of the emphasis pins, used when the DAC is in hardware mode)Mod:
DIR1701 EMFLG -> PCM1716 DM1
When a CD has pre-emphasis, EMFLG goes high. When DM1 is brought high, 44.1kHz digital de-emphasis is applied.
No guarantees! YMMV! Read the datasheets before you proceed. I was not careful with soldering, and pulled the entire leg off the PCM1716. It took *very* fine soldering to connect a fine wire almost directly on the remaining stump of the leg!
Enjoy. Also look into soft recovery diodes and better electrolytic caps for the board. I didn't touch the op-amp or or anything else. Channel Islands have done a very nice job in voicing the op-amp (class-A bias).
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Follow Ups
- Here's the mod - and it works - MB 01/6/0304:11:52 01/6/03 (3)
- what exactly this mod add to the sound of stock VDA? - kuma 09:25:42 01/6/03 (2)
- The mod adds de-emphasis capability... - MB 15:08:04 01/6/03 (1)
- ah.. ok. thanks for the explanation... - kuma 17:29:46 01/6/03 (0)
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