10K-220MHz VFO/RF Genetor SDR QRP HF Trans 1Hz 5kHz 10Hz Homebrew QRP This is a VFO (Variable Frequency Oscillator) project that can be used for self-made devices such as superheterodyne receivers, DCR, SDR or Ham QRP transceivers. It also has bar graph indicators for signal strength (S-Meter) and 20 Band presets. Can also be used as an RF/clock generator. This is the new version (V.2), I updated the previous project and it contains new features. Features: The working range is 10kHz to 225MHz. Tuning steps of 1Hz, 10Hz, 1kHz, 5kHz, 10kHz and 1MHz. Intermediate frequency (IF) offset (+ or -) is adjustable. 20 band presets (shortcuts) for BCB and HAM frequencies. Generator function mode. RX/TX mode selector for Homebrew QRP transceiver. The bar graph of the signal meter through the analog input (ADC). Used as a local oscillator on Homebrew radio receivers (such as superheterodyne, SDR, direct conversion and Homebrew QRP transceivers). Used as a simple RF/clock generator for calibration reference or clock generation. Can be used with Arduino Uno, Nano and Pro Mini. Use a common 128x64 I2C OLED SSD1306 display and Si5351 module. I2C data transmission, only 2 lines are needed to connect the display/Si5351 and arduino. High stability and accuracy of frequency generation. Simple but very effective and free.