Dan Koellen AI6XG Jun 16 13 min Don't Fear the Smith Chart Like many radio amateurs I was initially intimidated by the Smith chart. Transmission line and antenna theory, unfamiliar terms and...
Dan Koellen AI6XG Apr 25 9 min How I Killed a Microcontroller This blog outlines the steps taken to determine why a microcontroller no longer works, and the journey to find the damage on the chip.
Dan Koellen AI6XG Jan 25 2 min The Digi-Disco, a 1970's Light Controller This is a light system that I designed and built in 1978 to control large flood lights of different colors, synchronized to disco music...
Dan Koellen AI6XG Nov 23, 2020 1 min Wishing You a Very Random Christmas Being the holiday season I decided to post this article from the December 2014 issue of Nuts & Volts magazine www.nutsvolts.com that I...
Dan Koellen AI6XG Jun 29, 2020 7 min Big Font Clock Update: Dimmer-Interface PCB and Setup Instructions. A prior post described the development and build of a clock to display time and date for UTC and Local. The clock characters are large,...
Dan Koellen AI6XG Apr 5, 2020 3 min Auto Run for your Raspberry Pi - how to have your Rpi boot up in the desired configuration. The Raspberry Pi (Rpi) is a great single board computer (SBC) that can be used in many projects and comes in different configurations. I...
Dan Koellen AI6XG Feb 9, 2020 9 min Big Font Clock - Relieve for Old Eyes Recently the Maker Space that I frequent received a number of 4 line 40 character (4 x 40) LCD displays. They asked me to figure out how...
