This PCB prototype is a single-channel low-frequency signal analyzer and signal generator based on an STM32 processor. It is powered by USB and uses BNC connectors for easy connection to spectrum analyzers and oscilloscopes for signal observation. The system supports frequency response analysis of electronic circuits in the audio frequency range (20 Hz to 20 kHz). It can also function as an arbitrary waveform generator and a PCB-based oscilloscope. The design integrates external ADC and DAC ICs and implements analog filters for signal conditioning and processing.