48v Phantom filter cap size?

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jwhmca

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I have seen schematics call from any where from 47 to 220 @63v of course...  "C1" in this schematic.

http://www.jensen-transformers.com/as/as016.pdf

My question is can I use something as high as 1000? (all I have at the moment)

What would be the consequences?
 
hmmm.... seems to follow ;)

I was thinking more along the lines of charge up times issues, initial current issues, drain off... etc...
 
Charge up time would go from 44mS to 200mS (approx). Doubt you'd notice ;D
Initial current? Do you mean current to the mic? If so, again you wouldn't notice.
Drain off? Well in that circuit there is no bleed resistor so it would hold charge until the mic drains it, or until the leakage drains it.
 
Is it a good idea to have a auto drain on it? If so, just a resistor across the cap?
 
Doesn't *really* need a drain resistor. But if the phantom has been on, and then you plug in an unbalanced mic/keyboard/whatever, and then desk isn't muted, you'll get a nasty bang out of the monitors!
Most pre's have an led showing phantom "on", that will be enough to act as a drain.
 

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