View Full Version : Bypass Capacitors

09-16-2006, 05:29 AM
Alright, i know i was very confused on this and im sure alot of Kids first starting are also,but i want you guys to correct me because again i just researched this, Basically depending on the microfarad ammount, they hold a charge, anything above that charge gets grounded, that prevents noise spikes made by a magnetic field like an alternator, cars are very noisy in this way. Normally Its from an Ac/Dc Mixture and this allows the voltage to remain fairly the same, where if its above the 100uf it sends it to ground, if its under it it releases its charge to make up for the current drop. Am i right? haha

-Learn somthing about everything, and Everthing about somthing-

Chris Savage
09-16-2006, 05:53 AM
This thread is being moved from the BASIC Stamp Forum to the Sandbox Forum.

Chris Savage
Parallax Tech Support

Beau Schwabe (Parallax)
09-16-2006, 06:19 AM
willthiswork89 (http://forums.parallax.com/member.php?u=46541),

Please check out these references...

http://www.swarthmore.edu/NatSci/echeeve1/Ref/DataSheet/IntroToFilters.pdf#search=%22Capacitor%20filters%2 0passive%22

Beau Schwabe (mailto:bschwabe@parallax.com)

IC Layout Engineer
Parallax, Inc.

09-16-2006, 09:09 PM
I don't really think they ground anything and I doubt they have much influence on magnetic fields. When used as decoupling or bypass capacitors, they serve as a local source of charge to smooth fluctuations in the power supply. I think they mostly help with negative spikes, very small and fast dips in the power supply voltage.

- Rick