Some handy Rules of Thumb for tweakers.

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192.9.25.21

I dug out some notes I wrote down from school years ago, and found some
good info that comes in handy when we tweak our equipments.
Filtering caps applied to regulator outputs:
20u, 10u ... (tantalum, electrolytic), 0.1u ...(ceramic, ext. foil
mylar, glass)... in parallel, the bigger caps take care of the low
freq, and the smaller caps take care of the high freq.
Decoupling caps for ICs:
ICs have many transistors inside, when they switch, especially in CMOS,
there are spikes. The decoupling caps can supply this big current
to the transistors, instead of all the way coming from the power supply.
0.01u for small ICs, 0.1u for bigger ICs, so on and so forth. That's
why when you open up a computer, you always see a small cap right next
to an IC, or a group of ICs.
Polystyrene and polycarbonate caps are pretty stable with temperature.
Tantalum caps are not.

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Topic - Some handy Rules of Thumb for tweakers. - Ed 17:10:20 07/13/99 (4)

Re: Some handy Rules of Thumb for tweakers. - Jon Risch 21:51:33 07/18/99 (0)

Rule of thumb....... - Rodney gold 21:31:38 07/13/99 (2)

wellll... howabout... - gnat 22:32:03 07/14/99 (0)

Wife-beating hoax? - Steph_n 09:33:02 07/14/99 (0)

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