Starting on a pair of power supplies for two mono Nelson Pass AB100 amplifiers. Transformers will be 250VA, 32volts, with four caps per side.
I already have 8 of each of these caps, trying to decide which one to use.
Link to Both caps on Digikey
I already have 8 of each of these caps, trying to decide which one to use.
Link to Both caps on Digikey
Either one will be fine, with a tiny edge to the CDE for slightly higher lifetime under maximum load (but it won't be running max current 99% of the time).
Both essentially the same so flip a coin.
For new ordering, one is no more available, but since you have them ....
For new ordering, one is no more available, but since you have them ....
Switching power supplies do it not so much for ESR as for ESL. For example, the Hypex SMPS1200 switches at 100 kHz, which means harmonics to the low megaHertz. At those frequencies the 20-40 nanoHenries of a large capacitor becomes significant: Xl = 2πfL, so for a harmonic at 2 MHz the impedance is about half an ohm, enough to mess up the switching waveform. Packaging reasons also happen: many-small-caps will be shorter than one big coke can so one could fit the PSU into a smaller rack space.
At audio frequencies I think it's more or less a wash. McCormack amplifiers had good results placing smaller capacitors hard by each power transistor.
At audio frequencies I think it's more or less a wash. McCormack amplifiers had good results placing smaller capacitors hard by each power transistor.