that blanket statement is wrong, unless you qualify it with "the signal present is a perfect sinewave"there is peak to peak AC of 130V, which means the RMS is 46V.
It depends on what you mean by peak to peak. If you really mean peak to peak, with no DC present and a quiescent voltage near the middle, then 100V rating is enough for 67.5V peak. If you actually mean that the voltage can vary from +5V to +140V (which is also 135V pk-pk) then no. As always, context is everything.HiFiNutNut said:So for use in 135 peak to peak AC voltage only, is the 100VDC rated capacitor good enough?
Not necessarily.The 100V capacitor is underrated then because there can be 112V across it based on the current rail voltages of 56VDC.
in fact, you should have stated its connection or shown a schematic
You don't tell us where to where is the cap connected.