Clock for CD63KI

[Biskit]

Tom,

Yes I have the schematic.

The thing I was on about was the new 5v supply for the DAC mentioned on the acoustica site.

Quote from site: "If you can, use build separate regulator to feed DAC pin 27; then use a bulk electrolytic of your choice (>100uF) over the position of CD05 together with the capacitor added above and remove RD01 and connect in your new local supply - ferrite beads at this point are recommended. You can take your raw voltage feed from the +10v rail feeding the main 5v regulator on the board (the one wearing the small heatsink near the transformer); or as we did, add a separate DC-in socket to the main case for a separate external supply and future expansion.....but that's a different story. If you use a 7805 or one of the better replacements (LT1086 or LM317AT offer lower noise etc) you'll need a small resistor on the output of your new regulator to ground - 500ohm or so - to draw at least 10mA, or regulation is not guaranteed; the clock gate itself draws a mere 3mA. The modified circuit digram shows where to connect the new supply".

The question was intended to get a more laymans explanation.

Gordon

[martin clark]

Okay, to break it down a little further:

Use your multimeter to check the pins on the regulator in the middle of the player, the one with the heatsink. Relative to the ground plane you'll find one pin at 0v, one at +5V (output) and one at about +10v. You can, with care, connect to this +10v pin to get a raw feed for your new digital regulator(s).

If you check out how the leads are arranged for the powersupply to the DAC , you can find the links that feed +5v to the supply pins. So you can cut the links, and inject 'clean' 5V from your new regulator(s) to these pins directly. You'll need the NPC5872 dac datasheet, or the service manual to help (drop me an email and I can forward the datasheet).

All regulators perform better when loaded down a bit. This matters because some of the Dac supply pins only draw 1 or 2mA. We can't load the new regs heavily though, because the basic supply is only so big... hence suggestion to use a resistor to draw 10 or 15mA from the new regulators.

Finally, you can use an entirely separate supply to feed your new regulators (that's the reference to an offboard PSU) if you wish. I did for a while, but it's more hassle, doesn't add anything (if your regulators are any good!) and gave a noticeable 'warm up effect' - the player would take 10-15 minutes to come on song evey time . This was probably down to the quick lash-up implementation I did, but also why I didn't report further or recommend it on the webpage you found.

Hope this helps,
M.

[Farguar]

Hi Biskit.

I believe you can also purchase linear verisons of the regulators, a freind of mine played me a modified Rantzy with these devices and it was excellent - plenty of slam and very rythmic, sound stage was wide open soundstage and a Halo on treble..