Tutorials

How to Build a Passive Network Tap

How to Build a Passive Network Tap

In the course of my normal job, it’s surprising how often field expedient solutions are used to solve a problem. However, those field expedient solutions are impossible unless you understand the underlying principles involved. In this video I’ll look at Ethernet infrastructure, discuss how it works, […]

9 Volt, Battery Powered, Telephone Intercom System

9 Volt, Battery Powered, Telephone Intercom System

When I was developing the VoIP Fundamentals course, I wanted a demonstration to illustrate the simplicity of the public switched telephone network. After combing through the internet, I came across this ingenious little project. With just a 9V battery, a resistor, a telephone cord, and a […]

How to Listen to VoIP Conversations with Wireshark without Capturing the Call Setup

How to Listen to VoIP Conversations with Wireshark without Capturing the Call Setup

Sometime when performing a packet capture, you may come across some VoIP conversations. If the initial call setup is not in this capture, subsequent voice packets will be labeled in such a way that it makes it difficult to decode the VoIP conversation. What follows is […]

VoIP Dialing Without a PBX

VoIP Dialing Without a PBX

At one time I had the misconception that you had to have an IP PBX to use a VoIP phone, but it’s simply not true. In this video I’ll show you how to dial another VoIP phone without routing through the PBX or SIP Proxy. […]

A Beginners Guide to the LM386 Amplifier Circuit

A Beginners Guide to the LM386 Amplifier Circuit

After creating the amp in a jar by using KiCAD, I felt like it would be appropriate to review the workhorse in the circuit. So today’s video as a tutorial about how to use the LM386 audio amplifier. If you have any questions feel free to […]

How To Use KiCad to Make a Printed Circuit Board: Part 3

How To Use KiCad to Make a Printed Circuit Board: Part 3

This is the last part of the three part Kicad series. In this episode we will be learning how to take component footprints and put them together to make the final PCB product. If you missed the first two videos you can find them here […]

How To Use KiCad to Make a Printed Circuit Board: Part 2

How To Use KiCad to Make a Printed Circuit Board: Part 2

It’s time to associate a physical footprint to those schematic parts. This is the second video in a three part series about how to make a simple PCB using KiCad. If you missed the first video, click here. You’ll notice a bit of a quality […]

How To Use KiCad to Make a Printed Circuit Board: Part 1

How To Use KiCad to Make a Printed Circuit Board: Part 1

Welcome to the first ever Skinny Research and Development tutorial. In this episode I’ll teach you how to use the schematic (Eeschema) portion of KiCad to layout a circuit design. This is Part 1 of a three episode series to show how to take a hand […]