Oh Lordy! Why the -12V??? Make that line 0V (GND)!
The regulator on the Raduino is 5V out, and needs a minimum of 1.5V extra input. At its max current, that means 1.5Watts or so to dissipate, which likely would need heatsinking. At typical Raduino drain 300mA hat's abot .5W, so heatsink not essential. at 300mA, that 12r will drop 4V, so that 12r resistor should give Vc = 7 or 8V and would be dissipating that other 1W so will need to be a bit beefier - say 2 or 3W.
And reverse that circuit's In and Out (To Raduino)! NOW you've got an RC filter for the power line! As is, those C's are just extra reservoir on the MAIN power supply - which *might* reduce those annoying 'tuning clicks' but likely not eliminate them.
Mine worked fine with 5.1r 2W and 220uF.
73 de ZL2DEX
