Key benefits Provides a versatile test signal with adjustable amplitude and selectable frequency bands for electronics labs and prototyping Supports both 5 V and 12 V power sources, with corresponding output current capability Four frequency ranges cover common signal generation needs from lowfrequency testing to speed electronics Output amplitude ranges from 4.2 Vpp to 11.4 Vpp, with amplitude scaling based on input supply LED indicator gives quick real time status: low output means LED on, output means LED off, low frequency causes the LED to flash Duty cycle is adjustable for fine tuning, with the caveat that duty cycle and frequency are not independently adjustable; altering the duty cycle will change the frequency Technical specifications Main chip: N5555 Input power supply: DC 5–15 V Output amplitude: 4.2 Vpp (5 V input) to 11.4 Vpp (12 V input) Output frequency ranges (four options): 1 Hz–50 Hz; 50 Hz–1 kHz; 1 kHz–10 kHz; 10 kHz–200 kHz Output current: Maximum 15 mA at 5 V power supply (VPP greater than 50%); >= 35 mA at 12 V power supply (VPP greater than 50%) Duty cycle: Finetunable; not independently adjustable from frequency Output amplitude behavior: 4.2 Vpp to 11.4 Vpp; output amplitude depends on input voltage Control and indicators Output LED indicator behavior: Low output: LED on output: LED off Low frequency: LED flashes Duty cycle adjustments influence the frequency due to the nonindependent relationship between duty cycle and frequency Notes Different input voltages yield different output amplitudes within the stated range Four frequency bands are provided for convenient selection of common test signals Typical use scenarios Electronics bench testing and debugging Use the device as a portable signal source to inject known waveforms into microcontroller pins, ADCs, DACs, and sensor inputs during circuit debugging and validation. Signal integrity and calibration testing Generate controlled amplitude sinelike square wave outputs to verify response, timing, and recovery characteristics of measurement chains and signal conditioning circuits. Educational demonstrations Show the relationship between duty cycle and frequency, and illustrate how changing input supply affects output amplitude in a classroom or lab setting.