09-15-2014, 03:20 PM
Jerry,
I remember, you posted the photos in my thread.
As for the ecaps, when used in large pserul radios, one needs really to pay attention to the ripple ratings. I is not a cap's fault it is used under conditios outside the specifications.
And, unfortunately, ecaps of small capcitance also have small rippe current rating, a 20uF cap going possibly to 200-300 mA, which means that one needs to patallel-serialize them to meet the requirements. Good rule of thumb is, need an amp, rate an amp (very conservative folks go 5-fold). For continuous operation in enclosed space I would also rate at least 2-3 times the load.
But those caps sold by hobbyists websites are GP caps, not even high-ripple which you need several.
Yes a film cap is better, though I could never find their ripple specs.
I remember, you posted the photos in my thread.
As for the ecaps, when used in large pserul radios, one needs really to pay attention to the ripple ratings. I is not a cap's fault it is used under conditios outside the specifications.
And, unfortunately, ecaps of small capcitance also have small rippe current rating, a 20uF cap going possibly to 200-300 mA, which means that one needs to patallel-serialize them to meet the requirements. Good rule of thumb is, need an amp, rate an amp (very conservative folks go 5-fold). For continuous operation in enclosed space I would also rate at least 2-3 times the load.
But those caps sold by hobbyists websites are GP caps, not even high-ripple which you need several.
Yes a film cap is better, though I could never find their ripple specs.
