The PSRR of the placid is already excellent(I mean really excellent), but if you put the LCDPS in front of it it would be even better. :) Enough to worry over? No, but better. :)

Using for the 5V supply should not be any trouble at all. Just remove the on-board reg.

Good luck! :)

I ordered the supply.

I found in the diyaudio forum that it requires about 3V above regulation. So 8V input.

Also Russ says "The shunt employs a shaped compensation scheme that keeps the regulator stable even into large capacitances (I have tested 1000uf low ESR Pannasonc FMs). You typically do not want to load a shunt reg with a very high capacitance. It defeats the purpose."

I suppose the 100uf bypass cap after the regulator should be no problem

Voltage Drift

Is it normal to see a voltage drift from dead cold to operating temperature? I measure about -50mV. I set it to 5.13V right after turn-in and it settles to 5.08V


[update]
I found the answer in the diyaudio thread: http://www.diyaudio.com/...ated-power-supply-7.html

So it is normal for the output voltage to drift lower because of the negative temperature coefficient of the led references (I guess that's why you can buy voltage reference ICs that are temperature compensated)

Edited by user Tuesday, November 24, 2009 12:03:10 PM(UTC)  | Reason: Not specified

very good work as always glt!

The slight tempco drift from the LED VREF is something we chose to live with in order to get very low noise. For all practical applications it won't make any difference at all. The time period for such a change is very large. And once equilibrium is reached it will stay within a few uV over minutes,

Cheers!
Russ