Component selection

Discussion in 'General Electronics Chat' started by diwa2000@gmail.com, Jun 12, 2008.

  1. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    Hi guys
    I need to make a component selection for my circuit working at 433MHz as Im designing a receiver , the antenna of this receiver is connected to the RC filter, now as far as I know the resistor would be a normal resistor what about the capacitor....I need to have a capacitor value of 10pF....the question is would this capacitor be a normal capacitor or a surfacemount capacitor? and also this signal from the RC circuit goes to an LNA module and to a oeak detector....this peak detector is also a RF circuit ....and here I need a capacitor of value 0.1microFarad....which one would be this capacitor....a normal ceramic or surface mount ?
    Please help.

    Thanks
    Regards

    Diwakar
     
  2. nanovate

    Distinguished Member

    May 7, 2007
    665
    1
    surface mount
     
  3. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    Thanks verye very much mate..great help.
     
  4. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    A multilayer ceramic SMT cap is going to increase in reactance significantly at that frequency.

    I don't have my chart in front of me, but that 0.1uF cap at 433MHz is probably going to look more like 1uF.

    A 10pf multilayer ceramic would probably be around 14-15pF. If you used around 8pF instead, you should be in the ballpark.
     
  5. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    But now a new doubt has cropped my mind does the resistor also have to be a surface mount component. the value of resistor is 36Ohm.

     
  6. diwa2000@gmail.com

    Thread Starter Active Member

    Apr 15, 2008
    40
    0
    Thanks very much mate ...I really didnt think about this part in detail....I think I would go with a 8pF multilayer ceramic capacitor.

    In farnell and RS I have found out 8.2pF capacitor instead of 8pF....home that would do the trick...

     
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