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Resistor connection in a SMPS circuit

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cameo_2007

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hi guys,

here is an SMPS circuit..
i want to know why those R1,R2,R3,R4,100ohm resistor connected in series at the input?? and what is the actual purpose of C1...
please give me a clear idea on those...




thanks
 

Re: help in SMPS circuit

I can not see full size of circuit.
Attach this picture, please.
 

Re: help in SMPS circuit

hi,,,thanks..
have u tried copy pasting the url on your address bar...
if still not working,i'll try findin other way...
or do you mean the whole circuit u want to see..??
please reply asap

Added after 5 minutes:

ok,,ive attached the circuit part...
those R!,R2,R3,R4..??????
 

Re: help in SMPS circuit

The resistors are probably just basic current limiting for inrush (thermistors would be more efficient or an active inrush limiting circuit), and the capacitor is used for high frequency bypass (low Z at the switching freq) AC mains rated x-type.
 

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