>If your circuit draws a lot of power you might consider a larger value such >as 33uF or 50uF. Yet don't make it too big. Consider two caps -- one big, one small. >In addition it is a good practice to liberally sprinkle >bypass caps throughout the circuit board. The MOTM choice is >a .01uF axial cap. They are also ceramic, a radial lead ceramic might work even better. >There should generally be at least 1 bypass cap >for each power supply voltage every other IC chip, located as close >as possible to the chip. Yes, it is very important to place it as close as possible. >If your circuit includes additional voltage regulators you would >want to have an electrolytic cap and ferrite on the output of each >regulator as well. I agree about the cap, but I don't see the point in adding an inductor. Ferrite beads are useful keeping noise from coming down the pike into each PCB, but what is the advantage when used with a local regulator, such as a low-current three-legged regulator providing 5V to a few logic chips??
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[motm] Re: [Q] Power Rail Conditioning
2003-04-10 by media.nai@rcn.com
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