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Old 3rd December 2003, 09:31 PM   #21
Bricolo is offline Bricolo  France
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Quote:
Originally posted by jean-paul


Wrong thinking, Bricolo ! You'll never get that much wanted stock this way

I'm sure you only need 160
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Old 3rd December 2003, 09:34 PM   #22
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Sorry, I have 50 in stock. Not to mention my other caps.

If the price is right, buy them all. Sell what you don't need and have your own parts for free.

Yes, I am dutch
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Old 3rd December 2003, 09:36 PM   #23
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You can get as much as you like between 1 and 180

Make an offer !
I have no idea...
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Old 3rd December 2003, 09:37 PM   #24
Bricolo is offline Bricolo  France
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Neither do I
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Old 3rd December 2003, 10:04 PM   #25
Vigier is offline Vigier  Netherlands
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Hi,

just a small question besides this discussion (and a big HI to JeanPaul!)

I'm planning to build a power supply to feed 3 4th order crossovers. (that means driving 24 single opamps) The idea is to build this powersupply:

http://hitechnetworks.net/bwaldron/a..._regulator.htm

Click the image to open in full size.

Since the standard 4700F capacitors have a rather large impedance, I planned to replace each 4700F capacitor (that are C15, C16, C21, C22 in this schematic) with 4 United Chemicon SXE 470F/50V capacitors in parallel.
The capacitiance is 40% of what the schematic says, but the ESR of those parallel capacitors is WAY lower than with one 4700F, and the max ripple current is about 2 times as high.

Is this a good idea to do?

Grtz, Joris

P.S. The specs of the 470F SXE's: 0.068 Ohm maximum impedance at 100kHz (20 degr C.) Maximum ripple current at 100kHz (105degr C.) is 1320mA
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Old 3rd December 2003, 11:38 PM   #26
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A big HI to you too Joris ! The idea of replacing the 4700 uF caps for 4 x 470 uf just for very low ESR makes not much sense. In ripple calculations the capacitance value is the one you're calculating with unless you're dealing with a switcher.

So you have to know how much current your 24 opamp crossover will draw. Then use the rule of thumb ( or look up the formula if you wish ) that one 2200 uF will suffice for 1A of current draw. Now calculate how many 470 uF SXE you need before the regulators. I am confident 4 x 470 uF will suffice with modern opamps. Nevertheless calculate things. Why not use 8 x 470 uF if you have them ?

But... I wouldn't use low ESR caps *after* the regulators.

BTW we are threadjacking.

Jean-Paul/ who hopes Jan Didden is around for a theoretical backup.
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Old 4th December 2003, 12:07 AM   #27
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Hi,

Quote:
But... I wouldn't use low ESR caps *after* the regulators.
Neither would I unless you want an oscillator.

Cheers,
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Old 4th December 2003, 05:53 AM   #28
Bricolo is offline Bricolo  France
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Quote:
Originally posted by fdegrove
Hi,



Neither would I unless you want an oscillator.

Cheers,

and after a shunt reg (TL431), is it ok?
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Old 4th December 2003, 06:57 AM   #29
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40 gone.
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Old 4th December 2003, 01:01 PM   #30
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Hi,

Quote:
and after a shunt reg (TL431), is it ok?
According to the ON-SEMI datasheet, yes.

Cheers,
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