adding anything in series with the supply is going to do cause thisYou are wrong.
Since gusser will use local 5,600uF local storage caps, his IC-amps will see as power supply a voltage source with an impedance equal to the storage cap's ESR (so few dozens of milliohms) in PARALLEL (here lies your error) with the serial combination main storage caps' ESR plus dynamic diode forward impedance (which is the only branch you took into account).
Would he have not used the local storage cap (or too small a storage cap) and you would have been right.
But he did, and you're wrong.
As for gusser, some other possibilities:
- instead of diodes, coil in the 100uH range. No DC loss apart from due to the coil DC resistance, excellent filtering of rail-carried noise, and some energy storage (although smaller than in the cap for normal current values).
- by using schottky diodes, you'ld get only 0.3V loss across diodes, and so save up 70% of heat in those diodes. Easier since a smaller heatsink (if any) would have to be used.