Smoothing Capacitor value?

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hi everyone!

i have question "smoothing capacitors". have 5v arduino project have 6 individual 5v components attached it. since need these running @ different times, wanted take similar approach of nick gammon's in helpful example (http://www.gammon.com.au/forum/?id=12106) , use few mosfets switch these little guys on & off individually (instead of regular arduino pins), while minimizing potential power surges affect microcontroller and/or components themselves. these components 5v, , have maximum draw of ~170ma when powered on @ same time.

so, if used 6 different mosfet switches turn switch +5v power line on each component directed via arduino uno, wondering:
1. still use 1 capacitor (like nick did in example)?
2. capacitor of 100uf work, or should use bigger?

my plan first test circuit mosfets & capacitor(s) using usb, , later on, moving project battery power.

thanks in advance ideas & suggestions! :)

quote
these little guys

what guys?
which capacitor referring to?


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