NE555 timer pulse generator module is an astable multivibrator circuit board that generates a 3.7 Hz to 1.3 kHz square-wave adjustable PWM frequency output. This output pulse signal can be used for motor speed control, LED brightness control, bench signal testing, and more.
Specification of NE555 Timer Pulse Generator Module
The quick technical specification of the circuit board is given below.
| Module Type | Adjustable Signal Generator |
| Chip Used | NE555 |
| Input Type | DC |
| Input Voltage Range | +5V to +12V |
| Input Terminal | VCC, GND |
| Output Frequency Range | 3.7Hz to 1.3KHz Square-Wave |
| Output Current | 100mA Max. |
| Output Terminal | OUT, GND |
| PCB Colour | Blue |
NE555 Timer Pulse Generator Module Circuit Diagram
Schematic of ne555 timer pulse generator module circuit is shown below.
The components are used in the circuit boards are - U1: NE555 IC, R1: 1K 0603 SMD Resistor, R2: 10K 0603 SMD Resistor, PR1: 1M Multi-Turn Trimmer Potentiometer, D1: Red 0603 SMD LED, C1: 10uF 0603 SMD Ceramic Capacitor, C2 C3 C4: 100nF 0603 SMD Ceramic Capacitor, and P1: 3-Pin Male Header.
Working Pinciple of NE555 Timer Pulse Generator Module Circuit
The working of the 555 timer pulse generator circuit is simple. It is configured in astable mode where it continuously oscillates between HIGH and LOW states, producing a square wave output with no stable state.
When DC power is supplied between 5V to 12V, capacitors (C1, C2) filter out input noise, and LED D1 indicates the power-on status (protected by the current-limiting resistor R1).
At startup, capacitor C1 is uncharged state and causing the trigger pin (pin 2) voltage to drop to around 0.1V. This activates the integrated comparator-2 of U1 which helps to setting the flip-flop and making the output HIGH (about Vcc – 1.5V) for 70 ms. The integrated discharge transistor turns off, allowing C1 to charge through resistors R1 and PR1 from 1/3 Vcc to 2/3 Vcc.
When C1 voltage exceeds 2/3 Vcc, integrated comparator-2 of U1 resets the flip-flop which making the output LOW for 69.3 ms. The integrated discharge transistor turns on, and C1 discharges through PR1 from 2/3 Vcc down to 1/3 Vcc. The cycle repeats and producing a continuous square wave.
The potentiometer PR1 adjusts the output frequency. The output frequency is about 7 Hz with a 50% duty cycle at maximum resistance where the frequency reaches 1.4 kHz with a 98% duty cycle at minimum resistance.
A capacitor (C4) connected to pin-5 filters noise and prevents false triggering for stable operation.
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