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Roger Secura

Roger's Articles

The Beginner’s Guide to Digital Electronics
April 2016
Learn how the numbers “1” and “0” changed the world of analog and digital electronics.

Build a Digital Decade Box
February 2016
Having the right tool makes any job easier. This decade box allows you to select a required resistance with a couple of switches — so no more checking with an ohmmeter to see the actual resistance value.

How to Use a Transistor as a Switch
May 2015
Whether you need to flash an LED, energize a relay, turn a buzzer or alarm on or off, or invert a voltage level, the NPN transistor switch can easily solve your problem. This article shows you how to use a transistor as a simple SPST switch.

Build a Wireless Silent Alarm Warning System
December 2013
This is an inexpensive transmitter /receiver system you can build in one night that will let you know if something is amiss.

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