rickmcinnis wrote:My board has finally shipped so the scheming begins ... They do not get in any hurry to ship these. I paid for it two weeks ago.
I will be powering the three 3.3 v rails separately (or will I?). There is a fourth and fifth rail which I will power with the "standard" input.
Can't decide if using three batteries is really necessary or would one of the big batteries from the computer supply be sufficient?
Could the junk from the clock infect the other rails if only one battery is used and vice versa?
Only real construction difference would be the switch - two pole versus four pole - even though I might have to follow Randy and use relays here. I like being able to minimize wires lengths with the relays at the expense of having the relay power wires to deal with.
My inclination is to use three batteries but would take counsel if told it would be a waste of effort.
Rick,
I THINK they don't have them completed and sitting on the shelf, but have to do some final assembly, configuration, and checkout. They MIGHT have to order the LCD too once your order is placed.
My plan is to eventually power mine similar to how you describe, with 3x 3.3v lines and then 5v into the regular input, which will then provide power into the 2.5v & 1.2v lines.
How I'm tackling this is to first run it via the 5v line (to make sure it works ok, if nothing else) then later will add the other power supply points.
The SDTrans384 SHOULD have a lot lower self-produced noise than a full computer setup, so you MIGHT be able to get almost as good results with just two power rails (5v & 1x 3.3v into the clocks, microprocessor/memory card, and S/PDIF / I2S).
OTOH, if you want to go crazy with it, go with 3x batteries, one into each of the 3.3v points, and then another 2 batteries in series floating down to 5v for the main input
Very curious to hear about your results.
Greg in Mississippi