Universal VFO 10 KHz-160 MHz with Retro Analog Scale (variable frequency oscillator)

This article is sponsored by PCBWAY 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 Megahert