what are general design principles, rules of thumb to estimate if a PSU filter capacitor can be a low ESR polymer capacitor without causing stability issues? the 4700uF in pic rel can be polymer? i'll replace the 78M15 and 79M15 voltage regulators with LT3045/LT3094 modules which hopefully have the stabilizing capacitors integrated (i can't read the SMDs off of pictures except one of them is the correct 4.7uF for minimizing noise). can the 47uF be low ESR polymer or is it better to use audio grade bipolar electrolytic for minimizing leakage current?