NE555 Signal Generator Module – Adjustable Frequency & Duty Cycle

This NE555-based pulse generator module outputs adjustable square waves with selectable frequency ranges and duty cycle control. Ideal for MCU testing, stepper motor driving, and waveform generation in electronic projects.

Features:

• Adjustable square wave pulse output
• Selectable frequency ranges:
  • LF: 1Hz ~ 50Hz
  • IF: 50Hz ~ 1kHz
  • HF: 1kHz ~ 10kHz
  • UHF: 10kHz ~ 200kHz
• Onboard LED indicates output status (Low = ON, High = OFF, Flash = Low Frequency)
• Works with 5V to 15V DC input
• Easy frequency/duty adjustment with RA and RB potentiometers (0–10K)

Specifications:

• Input Voltage: 5V – 15V DC
• Input Current: ≥100mA
• Output Amplitude: 4.2V – 11.4V V-PP (varies with input voltage)
• Max Output Current: ≥15mA (at 5V), ≥35mA (at 12V)
• Timing Formula: T = 0.7 × (RA + 2RB) × C
• Capacitor Selection:
  • LF: 100μF
  • IF: 1μF
  • HF: 0.1μF
  • UHF: 0.001μF

Applications:

• Square wave signal generation for development/testing
• Pulse generator for stepper motor drivers
• MCU pulse input simulation
• Adjustable pulse control circuits

Note: Please turn off the power before switching frequency settings.