precision signal generator in a DIY kit with shell The DIY kit and shell produce precision sine, triangular, and square waves with adjustable frequency and amplitude. Frequency range: 1 Hz to 1 MHz; amplitude can be adjusted to suit the test needs. Wide power supply options: Supports 912 V DC or a 9 V battery, providing flexibility for bench use, portability, and easy setup. Accurate frequency resolution: Five frequency resolution options allow both coarse and fine adjustments for precise waveform output. Easy assembly and debugging: Designed for simple installation with directly insert components and a small number of parts, enabling a hassle build and troubleshooting. Enclosure and practicality: Comes with a compact shell for durable, convenient mounting on the workbench and safer handling. 23 practical use scenarios Electronics lab bench testing: Generate stable sine, triangle, or square signals to characterize and calibrate circuits, amplifiers, and sensors. Microcontroller and electronics projects: Provide reference waveforms for ADC/DAC testing, signal conditioning, or signal integrity checks in development prototyping. Educational demonstrations: Use to teach waveform types, frequency and amplitude control, and measurement techniques in classroom or makerspace settings.