Passives components occur in all electronic circuits, without exception, and yet are often the most overlooked part of a design by an electronic design engineer.
Often the reason that a circuit won't work as expected is because of the passive components. The main reason is that a passive component is never ideal but consist of all the 3 main properties. For example a capacitor can be defined as an ideal capacitor in series with an inductor, and a resistor (known as ESR or equivalent series resistance), and in parallel with a resistor (the current leakage through the dielectric). It is because of these often unseen components that a circuit might not behave the way it did on the EDA software. These days more and more of the passive manufacturers supply spice models for their components that can be used with EDA software but it is still important to have a good understanding of the principles. It is important to recognise the different qualities of the different technologies if you want to avoid problems later in the development of your circuit. Hopefully this group will help give a full understanding of the part passives play in a circuit.
Hope you enjoy this group. Please feel free to join and take part.
Design tools to aid in the use of Passive components
Disclaimer: All tools and infomation here are given with the best of intentions and in good faith. Being human and subject to the frailties of such a state, is not beyond the realms of possibility that I have made errors. Therefore I can't be held responsible for any errors and it is the user's responsibility to check the accuracy of all information displayed here.
A simple spreadsheet for the calculating the life of an aluminium electrolytic cap.
Covers from E6 to E192
What do all those numbers and letters stand for.
This spreadheet written by Dr Stephen Oxley of Welwyn is very useful if you might be pushing the resistor to its limits regarding voltage or power - it might not be as high as you expected, if you failed to take into account the limiting element voltage.
Other tools available at Welwyn
This tool created by my colleague John Siviter not only helps in the selection of a current limiting resistor for LED but also searches the Farnell website and offers suitable order codes.
My favourite white papers
These are some of my favourites of the white papers that I have downloaded from our suppliers - not in any particular order of importance. If you are the author or owner of any of the documents that I have uploaded and have any objections to me posting them, or have an updated versions, don't hesitate to contact me.
This white paper by Kemet goes through properties of these 2 very important capacitor technologies, describing in detail why you would use one over the other in certain circumstances and what the strengths and weaknesses.
This document by Nichicon goes through this technology, starting from basic construction. A must read.
Electric Double Layer Capacitors.
Panasonic Gold caps are covered in these 5 papers. Lots of info.
This paper for CARTS 2005 was written by Stephen Oxley of Welwyn, who knows probably as much as anybody about resistors.
This document is by Murata and is an essential read regarding the ageing process of Class 2 and 3 ceramics.
A useful document from AVX on Tantalums.
A good document about the product that started it all for Vishay.