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1 Jun 2012

Rectifier circuit with very low voltage drop featuring a P-channel MOSFET  – [via]

Different ways you can protect your circuit from backwards power connections. Diodes, schottky diodes and P channel MOSFETs.

P-FET Reverse voltage polarity protection tutorial – [Link]

24 May 2012

This video covers the basics of diodes, bridge rectifiers, and how to build simple unregulated AC to DC power supplies than can handle a few mA up to several Amps. Diode Tutorial & How to build an AC to DC power supply – [Link]

9 May 2012

www.adafruit.com writes:

Having a hard time trying to figure out whether that FET can handle enough current for your project? AN11158 from NXP might help clarify some of the many parameters that you need to take into account that are often overlooked.  The Safe operating area, for example, is an important one that often gets skipped and people just look at the best-case scenario marketing numbers on the front page of the datasheet: “The Safe Operating Area (SOA) curves are some of the most important on the data sheet. The SOA curves show the voltage allowed, the current and time envelope of operation for the MOSFET. These values are for an initial Tmb of 25°C and a single current pulse. This is a complex subject which is further discussed in the appendix (Section 3.1).”

Understanding power MOSFET data sheet parameters – [Link]

16 Mar 2012

The National Semiconductors that now belongs to Texas Instruments in 2002 brought together a large collection of circuits using operational amplifiers, are 33 pages of practical circuits with op amps, with formulas for calculations, and can adapt to your design with operational amplifiers. All together in Application Note 31 of the National Semiconductors.

Op Amp Circuit Collection – [Link]

14 Mar 2012

Everyone interested in analog electronics should find some value in this book, and an effort has been made to make the material understandable to the relative novice while not too boring for the practicing engineer. Special effort has been taken to ensure that each chapter can stand alone for the reader with the proper background. Of course, this causes redundancy that some people might find boring, but it’s worth the price to enable the satisfaction of a diversified audience.

Texas Instrument – Op Amps For Everyone – [Link]

10 Mar 2012

New electronics reference sheet. Karl writes – [via]

Our microprocessor reference sheet has been a great success and a valuable resource for many DIY hackers out there. We are proud to introduce an updated version, a second page with ATMegaXX4/Sanguino and a brand new
electronics reference sheet.

We now also have the reference sheet in bigger resolutions suitable for printing on both A4 and A3 paper.

New electronics reference sheet – [Link]

2 Mar 2012

Basics: Open Collector Outputs @ Evil Mad Scientist Laboratories – [via]

One of the joys of working with basic digital electronics– and logic gate ICs in particular –is that it almost works like building with a set of Lego blocks: One output goes here, which connects to the next input here, and so forth until it does what you wanted.

If you’ve played with chips like these, you’ve probably also come across chips with “open collector” outputs. And if not, they’re worth knowing about. Open-collector outputs form the basis of a number of clever tricks for level-shifting and interfacing between different types of logic, and from logic to other types of electronic circuits.

In what follows, we’ll work with the SN7407N, which is one of the most basic ICs with open-collector outputs. We’ll discuss what it means to have “open collector” outputs, and show some of the different ways that they are used.

Basics: Open Collector Outputs – [Link]

12 Feb 2012

adafruit.com writes:

Learning to design your own PCBs and being able to put together a schematic to solve a specific problem is both a valuable and rewarding skill. There are a number of resources out there to help you avoid common mistakes, but it isn’t always obvious to know where the values of certain common components come from, particularly common parts like resistors and capacitors. Figuring this out is part of the learning process, but it isn’t always easy to know where to look since you first need to know exactly the right terms to search for.

Choosing the Right Crystal and Caps for your Design – [Link]

11 Feb 2012

www.adafruit.com writes:

Analog Devices (who have a lot of great app notes locked up in their stable) have made available in PDF format enough good information and reading material to keep you busy for the rest of the winter while you wait for warm enough weather that you want to step outside again.  Their Linear Circuit Design Handbook has a lot of excellent material, and can also be ordered in printed format if you’re still a fan of a good old highlighter and notes in the margin like me.

Linear Circuit Design Handbook – [Link]

3 Feb 2012

dangerousprototypes.com writes:

Bypass capacitors ensure a device has a stable and clean power supply. In most cases capacitors are chosen out of habit, such as the typical 0.1uF ceramic capacitor we use.

This app note describes how calculate, model, and use different types of bypass capacitors. Included is a table with all the relevant information on different types of capacitors, and a few examples of different circuits that need different bypass capacitors.

App note: Choosing and using bypass capacitors – [Link]





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