Description
Product Overview
The NE555 Pulse Frequency Duty Cycle Adjustable Module is a compact, versatile signal generator built around the legendary NE555 timer IC – one of the most popular and reliable integrated circuits in history. This module generates stable square wave and rectangular wave signals with independently adjustable frequency and duty cycle, making it an indispensable tool for electronics experimentation, stepper motor control, and PWM (Pulse Width Modulation) applications .
Unlike basic fixed-frequency oscillators, this module gives you fine-grained control over both the signal’s speed (frequency) and its on/off ratio (duty cycle). Whether you need a low-frequency pulse for a flashing LED, a mid-range signal for driving a stepper motor driver, or a high-frequency clock for testing digital circuits, this module delivers.
At its core is the NE555 timer, operating in astable (free-running) mode. The module features a multi-range frequency selector and two precision potentiometers, allowing you to adjust the output from as low as 1Hz up to 200kHz, and the duty cycle from approximately 5% to 95% .
An onboard LED indicator provides real-time visual feedback: it lights up when the output is low, turns off when the output is high, and flashes visibly at lower frequencies – perfect for quick diagnostics without an oscilloscope .
Key Features
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Wide Frequency Range: Selectable from four ranges covering 1Hz to 200kHz, from slow pulses for visual indicators to high-speed signals for digital circuits .
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Adjustable Duty Cycle: Fine-tune the pulse width (on/off ratio) from approximately 5% to 95% via onboard potentiometer, essential for PWM motor speed control and servo positioning .
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Multi-Range Frequency Selection: Four jumper-selectable frequency ranges allow continuous adjustment across decades:
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Low Frequency (LF): 1Hz – 50Hz (timing capacitor C = 0.001µF)
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Medium Frequency (MF): 50Hz – 1kHz (C = 0.01µF)
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High Frequency (HF): 1kHz – 10kHz (C = 0.1µF)
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Ultra High Frequency (UHF): 10kHz – 200kHz (C = 10µF-100µF)
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Wide Operating Voltage: Accepts 5V to 15V DC power input, compatible with both 5V (Arduino, ESP32) and 12V (industrial, automotive) systems .
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LED Output Indicator: Built-in LED provides visual confirmation of output activity – lights on low level, off on high level, flashes visibly at low frequencies .
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Compact Form Factor: Small PCB size (approx. 31mm × 22mm), easily integrated into breadboards, enclosures, or permanent projects .
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Versatile Signal Levels: Output amplitude ranges from 4.2Vpp at 5V input to 11.4Vpp at 12V input, with output current of 15-35mA depending on supply voltage .
Technical Specifications
| Parameter | Operating Value |
|---|---|
| Main Chip | NE555 Timer IC |
| Operating Voltage | DC 5V – 15V |
| Operating Current | ≥ 100mA (recommended supply capability) |
| Output Current (5V supply) | ~15mA |
| Output Current (12V supply) | ~35mA |
| Output Amplitude (5V input) | Approx. 4.2V V-PP |
| Output Amplitude (12V input) | Approx. 11.4V V-PP |
| Frequency Range | 1Hz – 200kHz (4 selectable ranges) |
| Duty Cycle Range | Approx. 5% – 95% (adjustable) |
| Frequency Determination Formula | T = 0.7 × (RA + 2RB) × C |
| Dimensions (L × W) | Approx. 31mm × 22mm |
| Output Indicator | LED (lights on low level, flashes at low frequencies) |
| Operating Temperature | -20°C to +70°C |
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