Capacitor question

Here's some formulae...

The ripple current through a capacitor for a full wave rectifier system is:

Ir = Er * 2 * pi * f * C

Where Er is the ripple voltage, f is the frequency in hertz and C is the capacitance in farads.

Calculation of Er is more difficult. You need to know all the source resistances. Better to measure it. If you want the details, and you're able, find a copy of the Radiotron Designer's Handbook and read pages 1177 to 1182.

Good luck, Keith
 

kuma33

Member
2013-01-31 3:10 pm
Szeged
Hi guys,
can anyone tell me what are the electrolytic's specifications what influencing the audio signal? Or just the dielectrics material, the foil material, etc.? I have some Hitano EHR series el.caps, but the documentations aren't containing informations about the usability in audio applications..
 
Hi guys,
can anyone tell me what are the electrolytic's specifications what influencing the audio signal? Or just the dielectrics material, the foil material, etc.? I have some Hitano EHR series el.caps, but the documentations aren't containing informations about the usability in audio applications..

The usual answer to general questions is:

It depends.

It depends on what you are using the cap for.

Electrolytics for power supply filtering...If lower ability then increased ripple or droop under load could cause increased 120Hz in output of amplifier or clipping at lower power levels. Transient or sudden power requirements may not be provided for with "lower grade" caps.(all other factors the same)

Electrolytics for signal coupling...here is where opinions vary.

IMHO, if the Electrolytics cap can maintain a low enough impedance throughout the frequency range of interest then there is no issue with its use for signal coupling.

Some data sheets will have information that will help you decide but it may not be blatantly labeled as "for use in xxxxx application"

Hope that helps.
 

kuma33

Member
2013-01-31 3:10 pm
Szeged
Okay, i know the boof stuff, like "woodknob-resonance" or "amp chassis sound conduction", but the caps are different, because they are really in the signal path, like coupling or output elements..
But there are hundreds of cap types from low esr to long life, etc., and audio types too, like the silmics, with many, many parameters...