Linked Questions

6
votes
5answers
5k views

Is there a formula to determine the size of decoupling capacitors? [duplicate]

I have used many decoupling capacitors in circuits and have seen them in many textbooks, but they never give an explanation about why they picked a certain size of capacitor. Everyone seems to have a ...
0
votes
1answer
553 views

Understanding capacitor usage in the Sparkfun arduino [duplicate]

In the schematic for the Sparkfun Arduino mini pro 3.3v https://cdn.sparkfun.com/datasheets/Dev/Arduino/Boards/Arduino-Pro-Mini-v14.pdf there's a 0.1uF capacitor (C3) just left of the atmega ground ...
-1
votes
1answer
310 views

Decoupling Capacitor Value [duplicate]

I am taking 12V from Power card to my backplane card to use for Hard disks. I have been advised to put decaps of 330 uF on 12V supply. Can I use 220 uF or even lesser value. What is the criteria for ...
193
votes
17answers
163k views

What is a decoupling capacitor and how do I know if I need one?

What is a decoupling capacitor (or smoothing capacitor as referred to in the link below)? How do I know if I need one and if so, what size and where it needs to go? This question mentions many ...
17
votes
4answers
5k views

Will a 0402 0.01 µF ceramic capacitor next to a 0402 0.1 µF ceramic capacitor have any power decoupling benefits?

I always understood that the point of using smaller capacitors in parallel was to provide low impedance at higher frequencies than the bigger capacitors, because the higher capacitance capacitors '...
6
votes
4answers
10k views

LM317 circuit capacitor question

I am trying to figure out the significance of the two capacitors recommended for use in an LM317 DC-DC converter circuit. Recommended circuit diagrams show that I should be using a 0.1uf Ceramic ...
2
votes
3answers
2k views

What is the advantage of using many low-farad capacitors instead of a few high-farad capacitors, when trying to maximize current? [closed]

I am working on a high current application, and I am wondering, which maximizes current (over a short period of time), using a bank of small caps, or using fewer large caps?
1
vote
2answers
1k views

How to choose Decoupling capacitor? [closed]

I am designing simple monitoring application circuit, used 3analog inputs. Im confused that how to choose decoupling capacitor for that dc voltage stability and analog inputs. What kind of capacitor ...
4
votes
1answer
351 views

Audio oscillator cross-talk on small synth project

I am making a small 9V battery powered synthesizer with a square wave oscillator built around a 40106b Schmitt trigger (reference: http://richdecibels.com/blog/?p=11) and a few other components, one ...
1
vote
1answer
375 views

Amount of kickback from dc motor

I have set up a circuit similar to the one here. I was wondering instead of the 10 uf 50V capacitor, would A 100 uf 16 V or a 47 uf 6.3V capacitor work? I am asking because I don't know how much ...
0
votes
1answer
452 views

Why 0.1u decoupling capacitors?

Why is always prefered the value of 0.1u as decoupling capacitors that they placed very close to the chips? Why don't use larger, like 0.22u, 0.47u, 0.68u or 1u for example?
2
votes
3answers
105 views

How to determine the decoupling capacitor values for the power bus of an RF device?

While trying to implement an IoT solution using a quad-band mobile network module, supporting GSM,UMTS,LTE (2/3/4G), I advised to add all the following capacitor values to the modules power bus. I ...
0
votes
1answer
140 views

Decoupling Capacitor Calculation

I have few questions related to the schematics(BBB_SCH) sheet 2 in link There is a bulk decoupling capacitor of 10uF,10V connected to the pin ...