FILTER BASICS: STOP, BLOCK, AND ROLL(OFF)
A discussion on filter basics to give you a better understanding of how filters behave and are specified.

A casual observer might think that wireless systems consist primarily of filters connected by the occasional bit of circuit. Block diagrams of transceivers often include as many filters as any other function. This is true at the system level, just as it is at the circuit level — and many circuits behave in a filter-like way, whether intended to be a filter or not! That makes understanding filter basics important for wireless success.

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BUILD A CONFIGURABLE CLOCK/TIMER

You’ll be “alarmed” at all the cool features this unit has!

This project implements a clock/timer device with several handy features other than just a simple alarm. It utilizes a 16-bit PIC, the MPLab Code Configurator, and a serial LCD.

CNC ROUTERS: BACKLASH
Whether you own or intend to build/buy a CNC router, make it a habit to routinely check for backlash.

Backlash can have a detrimental effect on tool life and on your CNC router’s ability to maintain accurate positioning of the X, Y, and Z axes. In this article, we’ll look at the problem of backlash in CNC routers. Once you understand what role it plays, you’ll want to diminish its impact on your machine. Whether you own or intend to build/buy a CNC router, make it a habit to routinely check for backlash. It could save you some money and/or aggravation.

WHATEVER HAPPENED TO THESE WIRELESS TECHNOLOGIES?
A list of “forgotten” standards and services.

There are dozens of wireless or radio standards with different combinations of spectrum, modulation, and service. Some have survived and others have faded away. Some new standards have been added like 5G and 802.11ax or Wi-Fi 6, but what standards or services have disappeared? Here’s my list of “forgotten” wireless technologies.