High-precision signal generator in a DIY kit and shell that can produce sine waves, triangle waves, and square waves. Frequency range 1 Hz to 1 MHz, with amplitude adjustable for flexible testing and signal generation. Five accuracy resolutions with both coarse and fine frequency adjustment options, enabling precise and customizable frequency settings for a wide range of applications. Supports a wide power supply range: 9-12 V DC input or a 9 V battery. This versatility makes it suitable for benchtop use as well as portable setups. Easy installation and debugging with a small component count; all components are designed for direct insertion, providing a hassle-free setup and reliable operation. Use scenarios: - Bench testing and circuit debugging: generate reference waveforms to test microcontroller peripherals, ADC/DAC inputs, filters, and amplifiers. - Educational and hobby projects: demonstrate waveform concepts and oscillator behavior in class or DIY electronics projects. - Audio and sensor testing: provide stable waveform signals for evaluating audio circuits or sensor interfaces across the operating range.