All blog entries go in this Category.
Before we get started, you should know I am not pushing my own bug sweeping services. I do not sell my services commercially. I have 15 years of experience in technical surveillance countermeasures (TSCM) and am often called upon to give advice regarding many aspects of this profession. I gain nothing from this article other …
The objective of my career has been pretty simple up until recently. Bad guys want information X. Keep bad guys from taking information X. Simple enough. There’s also an Appendix to that objective. Bad guys always want to take information X. Build a program to stop bad guys from taking information X. Routinely check the infrastructure …
Knock off those network analysis cobwebs by downloading the file below and taking part in the Wireshark VoIP challenge. This a a short capture but a tricky one. Wireshark PCAP File MD5 Hash: 139b7dfea64ee097a4a415ba320cc5b6 The Challenge I’m currently putting together a new VoIP class and came across a nasty little Linux program that can manipulate VoIP …
The WiFi Pineapple is a very evil rogue access point (AP) that can quite easily trick an unsuspecting WiFi enabled device or user into connecting to itself. It does this mainly through a suite of programs called PineAP. Thanks to the makers of the WiFi Pineapple, Hak5, their website is full of Get Started tutorials …
It’s been about a year since my last tutorial. Over the last year I learned that teaching in the real world will take away time from teaching in the virtual world. Many people have contacted me asking about a tutorial for the 555 timer in Monostable mode. The great thing about this mode is that you …
This is the kind of stuff I love. Recently I was given a GPS tracker from an individual. This tracker had been embedded in a victim’s car for 6 years. The following video examines the tracker’s components and method of install. Below the video you’ll find some close-up photos of the device. GPS Tracker Photos …
If you’ve been following along with the 555 timer series, this video describes how to derive the formula that describes the timing of the circuit. Starting with just 2 components, we’ll work our way to an answer.
Continuing with a focus on the 555 timer, this video tutorial looks at how to vary the pulse width of a 555 timer’s output. It’s all possible with just a a hand full components. By varying the duty cycle one may vary the blink rate on an LED or the voltage being fed to a servo. Enjoy! …
For the past several weeks we’ve looked at blinky LEDs, 555 timers, and resistors. This week it’s time to put it all together into an application. A YouTube subscriber suggested the project as follows: How would you go about having an led blink twice, then a different one blink twice, then back to the original …
As we learned from the last video, resistors are helpful when you want to limit current. They are also helpful if you want to divide a voltage level, but in order to do any of this, it’s important to understand all about a resistor’s power rating. In this video you’ll learn how much power a …
Power Dissipation and How to Avoid Destroying a Resistor Read More »
