Yes that's right this never ending thread is active again!\r\n\r\nI'm getting all excited again about the possibility of making some further refinements to the Alpha 5.\r\n\r\nOne of the possible upgrades I've been thinking about is carrying out a more sophisticated re-clocking arrangement. Some time ago I fitted an upgraded Net Audio clock unit which is powered by an Audiocom clock PSU. \r\n\r\nIn the Alpha 5 [I]as standard[/I] the clock feed from the crystal goes to the SAA7220P/B where it is then distributed to the decoder chip and the DAC. The SAA7220P/B is known to be very noisy and 'pollutes' the clock signal and so I gave the decoder chip its own separate clean clock feed.\r\n\r\nThe clock feed from pin (16?) of the SAA7220P/B goes to pins 2 and 4 of the TDA1541A. This is the called the 'Bit Clock' (BCK).\r\n\r\nIn theory goes that it is better to give the TDA1541A DAC chip a bit clock feed from the master clock rather than from the SAA7220P/B. However you can't just take a clock feed directly from the master clock as the TDA1541A needs a bit clock feed of half the frequency of the master clock 5.6448 Mhz as opposed to 11.2896Mhz.\r\n\r\nWhat you need to do then is to divide the clock signal frequency by half before feeding it to the TDA1541A. This can be done with a flip-flop IC. \r\n\r\nI found this circuit on the audioworkshop blog (Credit: Ventsislav Simonov).\r\n[URL]http://blog.audioworkshop.org/low-jitter-clock-for-cd-player-upgrade-module/#.U4CPHyhN330[/URL]\r\n\r\n[URL=http://s983.photobucket.com/user/mikepickwell/media/BCK_RECLOCK_zpsc14f34a9.png.html][IMG]http://i983.photobucket.com/albums/ae313/mikepickwell/BCK_RECLOCK_zpsc14f34a9.png[/IMG][/URL]\r\n\r\nHere is a photo of the finished installation shown on the Audioworkshop blog. The clock is on the right and the flip-flop circuit is the small vertical board centre screen.\r\n\r\n[URL=http://s983.photobucket.com/user/mikepickwell/media/IMGP4524_LO_zps79a20e42.jpg.html][IMG]http://i983.photobucket.com/albums/ae313/mikepickwell/IMGP4524_LO_zps79a20e42.jpg[/IMG][/URL]\r\n\r\nIt all looks very neat and I'd like to give it a try.\r\n\r\nThe two yellow film caps and the Oscon aren't shown on the schematic. My best guess is that the Oscon is a decoupling cap for the +5v supply to the 74HC175N IC?\r\n\r\nThere is also the possibility of performing a 'DEM re-clock' but that's another can of worms for another day.