7MHz Transmitter with AVR Soft-keyer
In my last post, I went over the design of a Colpitts crystal oscillator design that put out a moderately clean 7 MHz…
Author: abram
7MHz Crystal Oscillator Design
After constructing a 40m wire dipole that works with my SDR setup, I needed to start working on a transmission system. At the…
Testing a 40m Wire Dipole on Mt. Hood
Here’s a quick video showing how I deployed a DIY 40m dipole antenna on Mt. Hood a while back. Though not the most…
2m AM Exciter
Here’s a project that I’ve been working on for a class recently. This is a very basic 2m AM Transmitter that operates from…
Basic Voltage-Controlled Amplifier
I’ve been looking at the theoretical principles that govern the voltage-controlled amplifier (VCA) recently and came across some simple VCA designs that caught…
The Cicada: a push-pull vacuum tube amplifier build
Well, 2017 is more than half over now. This means I should probably post something to get at least one post in for…
Milling PCBs with Linux…
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…
#NoDAPL
I believe it’s time to put an end to this kind of insanity. There can be no economic growth if human beings continue…
Differential Amplifier w/ Cathode Follower
This is a circuit designed for a classroom project whereby the instructions were to “improve” a differential amplifier circuit. The differential amplifier design…