I'm designing a power supply for multiple guitar pedals. To minimise noise I'd like the output voltage to be smooth when it's up and running. (I don't mind about small transient fluctuations when plugging in). I also want to eliminate ground loops by isolating each pedal's supply.
My design involves a toroidal transformer, bridge rectifier, smoothing capacitor, and an optional voltage regulator. This supplies multiple isolator assemblies.
The isolator assembly will include a DC/DC isolator plus the recommended inductor (in series) and capacitor (in parallel) to accompany it.
To ensure smooth output from the isolator assembly, should I add a regulator before the load?
A possible final regulator would be: Texas Instruments LM2940CT-9.0/NOPB, LDO Regulator, 1A, 9 V, 10.5 → 26 Vin 3-Pin, TO-220.
Otherwise, the isolator would be: Murata Power Solutions NMG 2W Isolated DC-DC Converter Through Hole, Vin 10.8 → 13.2 V dc, Vout 9V dc. (I know that wouldn't work in front of the TI regulator because it requires 10.5V in.)