DaveC wrote in
:

A motor start cap should be ok. They're meant for intermittent use
under heavy load so they don't accept heavy ripple currents for lomg,
but this one won't have to, with a few tens of kilohms between it and
the mains.

A single rectifier in series with 50 ohms feeds the charge current to
the cap. Seems that 150v is a bit overkill, no? (The 25K pot is on the
discharge side of the circuit which is switched in at the appropriate
time.)

I think I'm going to go with the 270mfd / 125v start cap. It's
sourceable locally, fits the space, and although a bit low on the
capacitance it will fit the bill better than what's there.



Don't worry if the cap is specced for a higher voltage, if it's cheap, have
at it, the margin of safety is good, the wider, the better.