7MHz Transmitter with AVR Soft-keyer abram, March 3, 2019October 19, 2021 In my last post, I went over the design of a Colpitts crystal oscillator design that put out a moderately clean 7 MHz signal. In order to match the output impedance to 50 Ω, an NPN feedback pair (at least that’s what I’m calling it) was designed. While meeting the… Continue Reading
Milling PCBs with Linux… abram, October 17, 2016September 1, 2017 This is a quick outline of my LinuxCNC setup. Basically, I have an old HP Compaq Pentium IV that’s running Xubuntu 14.04. I had to install the Xenomai real-time kernel in order to make it work with LinuxCNC 2.5.2 which controls my Chinese CNC3020T. I’ve been using 0.1mm 30° engraving… Continue Reading