Introduction to PWM - Pulse width modulation types
Adjustable PWM Pulse Signal Generator 1CH 1 150KHz 8A Driver Module LCD Frequency Duty Cycle for LED Light Motor Solenoid Valve|Signal Generators| - AliExpress
How to Build a Pulse Width Modulation Signal Generator - Circuit Basics
Simple Solutions for a Single-Device Pulse-Width Modulation (PWM) Waveform Generator