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Old 24th January 2004, 11:10 AM   #1
hbarki is offline hbarki  Indonesia
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Default Power Supply Caps for Zen V4

Hello,

Have some questions regarding power supply caps:

I tried looking in Digikey catalog and found a 27000uF caps rated at either 50V or 63V.

1. Since we have a power supply output at 50V, should I be using more than 50V rating? (please let me know if I am wrong here).

2. Also, why most large capacitor (more than 27000uF) in the catalog has less than 50V rating?

3. Does it matter whether I am using a snap-in capacitor (soldered connection) or screw-in connection?

Any help appreciated, thanks
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Old 24th January 2004, 01:57 PM   #2
MikeW is offline MikeW  United States
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Use more than 50 volts.
As the voltage and capacitance goes up so does the size of the cap.
It doesn't matter.

Try this link. It has some big caps. Look at the computer grade.
http://www.meci.com/
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Old 24th January 2004, 05:29 PM   #3
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Default Re: Power Supply Caps for Zen V4

Quote:
Originally posted by hbarki
Hello,

Have some questions regarding power supply caps:

I tried looking in Digikey catalog and found a 27000uF caps rated at either 50V or 63V.

1. Since we have a power supply output at 50V, should I be using more than 50V rating? (please let me know if I am wrong here).

2. Also, why most large capacitor (more than 27000uF) in the catalog has less than 50V rating?

3. Does it matter whether I am using a snap-in capacitor (soldered connection) or screw-in connection?

Any help appreciated, thanks

The ouput of the raw supply is right at 50v when loaded. I feel more comfortable with the 63 volt caps. But this may not be an issue. A 50 volt rated cap should work fine at 50 volts.

George
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Old 24th January 2004, 06:28 PM   #4
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Generally there is some margin built into the ratings. I
wouldn't be that concerned.
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Old 29th January 2004, 01:01 AM   #5
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Quote:
2. Also, why most large capacitor (more than 27000uF) in the catalog has less than 50V rating?
Good question. I think two reasons. 1) Digikey doesn't deal much in "big hardware." Most of their parts relate to lower power electronics rather than high-power stuff. 2) As energy storage devices, capacitors get smaller in capacitance as the voltage goes up, reflecting the tendency for circuits of different types (I'm thinking tubes (high voltage) vs. solid state (low voltage)) to operate at similar power levels. Hence, your 27KuF cap at 50 volts might be a 6.8KuF cap at 200V for a tube circuit, which would run at correspondingly lower currents.

Does that make sense? Anybody else want to weigh in?

Quote:
3. Does it matter whether I am using a snap-in capacitor (soldered connection) or screw-in connection?
Not at all, although some might have preferences.
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