[Robotgroup] EMI suppression on power supply

[Def Egge]

Thanks for confirming the function of the capacitor, Andre'.

To answer your question, yes, the resistor is in parallel with the 
capacitor.


All the best....

Mike



At 20:49  2008-03-16, you wrote:
-=-=-=-=-= begin quoted message =-=-=-=-=-
 >The capacitor is simply to shunt high frequency noise from the 
front
 >end of
 >the step down transformer and from the rest of the low voltage
 >regulators as
 >well. But, the resistor is questionable. So you are saying the
 >resistor is
 >in parallel with the capacitor?
 >
 >Andre'
 >
 >
 >----- Original Message -----
 >From: "Def Egge" <robodigest at innervate.com>
 >To: "The Robot Group" <robotgroup at puremagic.com>
 >Sent: Sunday, March 16, 2008 7:42 PM
 >Subject: [Robotgroup] EMI suppression on power supply
 >
 >
 >
 >I am looking over a non-functioning power supply (removed from a
 >mid-1990s desktop system).  I see at the 110VAC power connector a 
330
 >nF capacitor (p/n RIFA PHE-830 M) installed between the 100VAC hot
 >and neutral leads, I presume, for EMI suppresion.  Is this correct?
 >
 >The leads of the capacitor are, in turn, connected by a 500 ohm
 >(according to my DMM) 1/4-watt resistor 
(green-red-brown-gold).  The
 >gold band indicates 5% tolerance, so this is a 520 ohm resistor 
(+/-
 >26 ohm), correct?  What is the purpose of the resistor?  Curious
 >minds desire to know more.
 >
 >
 >--
 >
 >All the best....
 >
 >Mike
 >
 >_______________________________________________
 >Robotgroup mailing list
 >Robotgroup at puremagic.com
 >http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup
 >
 >_______________________________________________
 >Robotgroup mailing list
 >Robotgroup at puremagic.com
 >http://lists.puremagic.com/cgi-bin/mailman/listinfo/robotgroup
-=-=-=-=-= end quoted message =-=-=-=-=-