Still no digital camera
, but I've some more reports you might be interested in.
At the moment I'm using a 75R 1206/10uf 35v Rubycon ZA as loopfilter. The dac takes a second to lock on to the transport, but it seems to have gained a bit of oomph. Ditto a 4.7uf ZA on pin 20. I've ditched the 75R resistors on pins 1 & 2 of the 1543.
Everything earths to the same ground plane. Separate DIG and ANAL for a cleaner sound and combine for a beefier one.
All LM317 as regs makes the sound airier and easier, with 1206 SMD resistors and ADJ and Vout bypassed with 47uf 50v Panasonic NHG as per Avondale TPR.
5.6uH is before and after each reg.
The 1543 supply is currently LM7808 > 5.6uH > 1543 > 4.7uf X7R 1206/35v 3300uf Panasonic FC to ground.
In a fit of puritan radicalism I decided that supports don't matter. But the sound was too "ringing" in the upper mid and not lush enough. A square of foamed butyl rubber (from zanash - please check your PM) under each bit of kit did the business. The foam looks like the same material used to make camping matts.
Note that as the DAC has no case, it sits on a 30cm square anti static bag to stop it getting zapped.
I bought one of those hot glue guns, which has proved extremly useful for securing leads and components.
Oh, and the coupling caps are good old 220uf 10v Sanyo SG.
Y5V 1206 ceramics? Puh-
leeze.