Episode #13: Voltage dividers

Understanding voltage dividers means understanding Ohm's Law.  A common use for a voltage divider in most projects is to monitor a battery.  Say you are powering your circuit with a 9V or 12V battery. Microcontroller boards don't do well with those voltages.  

In a future video, we'll come back and look at more circuits they can be used in.

Posted on January 16, 2015 .

Episode #12: Unboxing the Raspberry Pi Model B+

The other day I got an interesting email.  It offered me a raspberry pie.  The sender claimed it was only a "B+", but hey, who am I to turn down free pie!?

Jokes aside... In this AddOhms episode, I give some first impressions of the new Raspberry Pi Model B+.  It isn't an all-new board, but it does have some very nice improvements over the B.

Do you have a project that benefit from the Pi B+?  If so, what is it?  Leave a comment below.

Posted on August 3, 2014 and filed under Microcontrollers.

AO #11 - MOSFETs! (Part 2 of Transistors)

Following up from Episode #10 on BJT, this episode is focused on introducing MOSFETs. It is the longest video we've done yet, coming in just over 7 and a half minutes.  

There is a basic overview of how MOSFETs work, compared to a BJT.  And something that is really important to consider:  how hot is it going to get?  So we go through how to calculate power dissipation and if you need a heat sink.

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If you have questions about MOSFETs or AddOhms, leave a comment below.

Posted on July 18, 2014 .

Episode 10: Transistors Part 1 of 2 (BJTs

The two most popular kinds of transistors you might use for a project are either BJTs or MOSFETs.  With so many options, it was tough to pick just a few.  In AddOhms #10, we look at NPN BJTs and how to use it as a switch.

in #11 we'll come back and cover the high current brothers:  MOSFETs. 

Transistors are electronic switches that are used to control things that would kill an Arduino, Raspberry Pi, or Beaglebone. There are two major types known as a BJT and MOSFET. This is part 1 of a two part series, which looks at BJTs first. Learn what they are and how to use them.

There's a new section just for Videos on Electronic Components.

We covered the 2n3904 in this video.  What BJTs are your favorites and why?  Leave a comment below.

Posted on May 9, 2014 and filed under Components.

Trailer for Youtube

One of the features of a channel page on YouTube is a trailer video.  It's a chance to introduce people who aren't familiar with your channel.  Subscribers won't see it, only non-subscribers.  To help explain AddOhms, we've created an introduction video.  This replaces the first one where I introduced AddOhms from my lab.  

Since AddOhms is more about the drawing than a bald engineer on camera, I thought it made since to create an AddOhms-style introduction.

Posted on April 20, 2014 .