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Originally Posted by Magnavox300
Thanks for the clarification!
Also, am I right in getting a 100uf and a 50uf?
Looks like they put the microfarads next to the proper combination, right?
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Yes, a 100uF and a 50uF should be fine, as that is the largest set of values listed. Most likely, those are the actual ratings of your can.
Your old can was actually a replacement, and was marketed as being able to replace several ratings of caps, as increasing the capacity somewhat is generally not a problem in power supply filters. A 100/50 could safely replace all those combinations shown (and probably a few others). Just make to get new caps with an equal or greater VOLTAGE rating. The voltage rating on yours isn't visible in the photo.
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Originally Posted by snelson903
while we are on the subject of caps. here's a question i have never really been sure of, when you take a cap. wired in a parallel the lets say 22 mfd 450 v with another that is equil in value, it becomes 44 mfd what then is the voltage rating become together is it now 900 v or 225 v or remain 450 v. could it now be used in a circuit requiring a 800 volt 44 mfd cap ,or stay at 450 v making it a 44 mfd 450 cap. or what is the voltage rating become of two caps in a serise 22 mfd + 22mfd = 11 mfd does the total voltage together drop along with mfd value , or increase because there are two in a series . this is why i have never used caps. in this way unless the voltage needs were way below any concern.
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For capacitors in parallel, the capacitance ADDS, but the voltage rating will remain the same as the lowest rated unit. 2 22uf/450V caps in parallel form a 44uf 450V capacitor.
For capacitors in SERIES, the capacitance DIVIDES, and the voltage rating ADDS. 2 22uf 450V caps in series effectively become an 11uf 900V capacitor. When series capacitors are of different values, the math gets a little trickier, because voltages may not divide equally across the string. Resistors in parallel with each cap are recommended when using them in series to ensure proper voltage division.