Some of my projects and technical posts

 


 

The WA5BDU Keyer – An Arduino keyer that can be used in a minimal mode, or as a full-featured keyer.

 

http://www.wa5bdu.com/the-wa5bdu-keyer/


An Arduino Si5351a Quadrature VFO Controller – Takes a basic Si5351a control scheme and expands it to a full-featured VFO including band changing, step size selection, CW pitch offset with a T/R input to alternate between TX and RX frequencies, RIT, USB/LSB selection and more.

 

http://www.wa5bdu.com/si5351a-quadrature-vfo/


 

Programming the Si5351a synthesizer – This page is not a construction article, but is a discussion of how registers which control the frequency and phase of the Si5351a are calculated.

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http://www.wa5bdu.com/programming-the-si5351a-synthesizer/

 


An Arduino Frequency Counter – Here’s an Arduino frequency counter that uses the 74LV8154 32-bit counter IC. A simple version uses the Arduino’s clock for a time base and a more accurate version uses a HEF4521B 24-bit divider plus crystal oscillator IC to provide a 1 second time base.

http://www.wa5bdu.com/an-arduino-frequency-counter/