Tutorials

555 Timer Circuit

555 Timer Output Stage

The 555 timer has many uses and in this video we’ll explore two different ways to utilize the output. First we’ll see how the the timer can be used to source and sink current and secondly we’ll look at a way to use the timer as a control mechanism for another circuit. If you missed …

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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, and build a passive network tap.

VoIP Phones

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. Linphone: http://www.linphone.org Grandstream phones for under $50: http://www.ebay.com/sch/i.html?_from=R40&_sacat=0&_nkw=grandstream&_udhi=50

Amp in a Jar

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 leave a comment. Link from the Video: http://www.ti.com/lit/ds/symlink/lm386.pdf