A Digitally Controlled Analog VFO.
So OK here is the great reveal on some of the earlier posts on this blog. I built a prototype of a stepper motor controlling the main tuning capacitor of an analog VFO.
We now have a digitally controlled Analog VFO. This is the first time that I have actually used an Arduino to control a stepper motor. Old hat undoubtedly to many of you; but a first for me with the Arduino. About 10 years ago I dabbled with a project using a PIC16F84. I was totally lost in the Assembly Language.
We will now, some 10 years later, circle back to that old project. It involved the controlling of a remote antenna tuner. This effort with the controlling of the capacitor with a stepper motor is a stepping stone to the Antenna Tuner.
See my website for more details on the VFO, the code to control the stepper motor including the LCD readout and the code for automatic zeroing of the capacitor on power shutdown. It also describes the Antenna Tuner Project approach and how the LCD will provide the readout for setting the capacitors and the tap points for the inductor using shorting relays.
Be sure to visit Yvan's website www.brainy-bits.com for the many excellent tutorials. It all started with his you tube video.
But for now as you will see the whole thrust of digitally controlled Analog VFO was to give deference to my friend Bill in recognizing the relevance of the analog VFO in today's rigs. At the same time we have the ability to add a touch of "digi" stuff to simulate the HRO dial mechanism.