Dan Koellen AI6XG6 days ago6 minReactive Component Measurement With the NanoVNAExploration of using the nanoVNA to measure inductance and capacitance at frequency of use.
Dan Koellen AI6XGMar 211 minToroid Transformers - How Hot Will It Get?There are a number of factors in choosing a toroid for a RF transformer. While one may model electrical performance, calculate predicted...
Dan Koellen AI6XGJul 20, 20219 minElectrostatic Discharge (ESD), Does it Matter for Makers and Hackers?Electrostatic Discharge (ESD) is a subject that can inspire a lot of discussion, head shaking and some misunderstanding. ESD damaging...
Dan Koellen AI6XGJun 16, 202113 minDon't Fear the Smith ChartLike many radio amateurs I was initially intimidated by the Smith chart. Transmission line and antenna theory, unfamiliar terms and...
Dan Koellen AI6XGApr 25, 20219 minHow I Killed a MicrocontrollerThis 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 AI6XGJan 25, 20212 minThe Digi-Disco, a 1970's Light ControllerThis 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 AI6XGNov 23, 20201 minWishing You a Very Random ChristmasBeing 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 AI6XGJun 29, 20207 minBig 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 AI6XGApr 5, 20203 minAuto 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 AI6XGFeb 9, 20209 minBig Font Clock - Relieve for Old EyesRecently 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...