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Old 26th March 2012, 04:51 AM   #1
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Default 475k capacitor?

I must identify a capacitor value on the crossover of my loudspeakers. What is likely the value of a "475K/250V" metalyzed polyester capacitor?

Some information:

  • A 1,5K/100V capacitor (I guess it's a 1,5uF one) is paralleled to the above mentioned capacitor.
  • There's also a 3,3K /100V capacitor (I guess it's a 3,3uF one).
  • The crossover type is first order
Is a 475K actually a 0,47uF or 47uF capacitor?

I sent an email to the Manufacturer (Expotus) some time ago but their customer support service couldn't clarify my doubt. I was only told that it was possibly a 0,47uF capacitor and the third number is referred to its tolerance (5%). If it's true, the correlate capacitance to the paralleled capacitors is around 2uF. Do 3,3uF and 2uF values make any sense for a first order crossover?

If someone can help me with this identification I'd appreciate. I'd like to avoid to take the capacitor off as all parts are fixed with hot glue. I have experience with solder but I'm thinking of having the crossover modification done by a more skillful technician. Otherwise, I'll have to purchase a hot glue pistol and other appropriate tools. I'm afraid of making a mess on the crossovers when melting the silicon glue.

Last edited by Audio Maniac; 26th March 2012 at 05:03 AM.
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Old 26th March 2012, 05:10 AM   #2
CBS240 is offline CBS240  United States
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Usually it is like this:

101=100pf
102=1nf
103=10nf
104=100nf
105=1uf
106=10uf
107=100uf......

475=4.7uf.

If still in absolute doubt, and you have a function generator and a meter or scope, you can place a resistor in series and determine the value by the voltage drop. Figure the Z of the capacitor in the voltage divider, Z=1/(2pi*F*C). Solve for C.
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Last edited by CBS240; 26th March 2012 at 05:20 AM.
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Old 26th March 2012, 05:19 AM   #3
benb is offline benb  United States
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A three-digit number on a capacitor is usually two significant digits followed by the number of zeroes in picofarads. That's 4700000 or 4,700,000pF or 4.7uF. I vaguely recall that the letter k indicates tolerance, but I don't recall exactly what tolerance corresponds to k.

4.7uF in parallel with 1.5uF would be 6.2uF. This is a "reasonable" value for a crossover, but it's hard to tell how this would relate to the 3.3uF value without seeing the complete crossover schematic.
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Old 26th March 2012, 06:06 AM   #4
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4700000pF it is. 4.7uF.
k = +/-10% tolerance.
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Old 26th March 2012, 07:25 AM   #5
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Oh God!
I must change my placed order. I've just placed the order to Madisound.
Thanks a lot for your help!

Regards

Last edited by Audio Maniac; 26th March 2012 at 07:46 AM.
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Old 27th March 2012, 05:20 AM   #6
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I managed to change the order eventually. Thanks a lot for the support.
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