This article is sponsored by PCBWAY www.pcbway.com/
A variable frequency oscillator (VFO) is an oscillator whose frequency can be tuned (i.e., varied) over some range. It is a necessary component in any tunable radio transmitter or receiver. This time I will show you how to make a VFO that covers the range from 100 KHz to 160 MHz and uses a minimum number of components. The selected frequency is displayed on a beautifully designed retro scale in the style of ham radios from the previouscentury.
The device is relatively simple to make and contains only a few components.
ESP32 Dev. kit board
1.8" TFT Display with 128x160 dots resolution (ST7735 chip)
SI5351 programmable clock generator board
Rotary encoder with push button
three buttons
and Output connectors
Turning the rotary encoder changes the frequency. The tuning step, and thus the scale rotation speed, is controlled by the two buttons, and ranges from 10 Hertz to 1 Megahertz. With the the rotary encoder button we memorize the current frequency. The oscillator also has the ability to memorize previously defined frequencies in the code, that we can call up with the MEM button. And finally, the whole device is embedded in a suitable box made of PVC material with a thickness of 3mm and 5mm, and coated with colored self-adhesive wallpaper.
Detailed instructions, schematic, and code at:
www.hackster.i...
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by mircemk
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#Arduino #ESP32 #VFO #PCBway
15 окт 2024
