Versatile waveform output: Generate sine, triangle, square, and forward/reverse sawtooth waveforms with this multifunction low frequency signal generator, ideal for diverse electronic testing and DIY experiments. DIY kit: Includes all throughhole components for straightforward assembly, offering a rewarding soldering practice experience. PCB board size 81 x 51 mm. Wide frequency and duty control: Frequency adjustable from 5 Hz to 400 kHz and duty cycle from 2% to 95%, with coarse and fine adjustment functions for precise signal calibration. Low distortion performance: ICL8038 based design with speed operation and dual power support, delivering minimal distortion (1% sine wave distortion and 0.1% triangle wave linearity). Applications and use scenarios Electronics testing and prototyping: Inject reference signals to test opamps, filters, and RC networks; calibrate measurement equipment and circuits. Educational DIY projects: Handson assembly and testing to build practical signal generation skills and deepen understanding of waveform characteristics. Audio and instrumentation experimentation: Explore signal behavior in audio circuits, controllers, and instrumentation setups requiring stable, multiform wave signals.