Resistor Chip Arrays
Product Name: NE555 Pulse Adjustable Generator Kit
Product model: TJ-56-638
Operating voltage: DC5~15V
PCB size: 38*29mm
Description:
This kit is used as a square-wave signal generator to generate square-wave signals for experimental development. Used to generate the square wave signal to drive the stepping motor driver; Generate adjustable pulses for MCU use; Generate adjustable pulses to control related circuits. Output with LED indication, optional output frequency range, fine tuning, output duty cycle can be adjusted.
Circuit diagram:
Circuit principle
The circuit consists of NE555 and its peripheral circuit. The power supply is input from 2 or 3 legs of J5, and C6 is the filter capacitance of the power supply. Resistors R2, R3 and jumper cap select the capacitor Cx to connect to form a timer circuit.
High level time: tPH_0.693* (R2+R3)*Cx
Low level time: tPL_0.693*R3*Cx
Oscillation period: T=tPH+tPL_0.693* (R2+2R3)*Cx
Oscillation frequency: =1/T_1/[0.693* (R2+2R3)*Cx]
Therefore, adjusting R2 and R3 potentiometers or choosing which capacitor to connect with using a jumper cap can change the frequency of the output pulse, and adjusting R2 and R3 can also change the duty cycle of the waveform. The pulse signal is output at 555's 3 feet. At low output level, D1 will light up, but not at high level. So the frequency of pulse can be obtained at low frequency through D1 flicker frequency. At high frequency, the flicker frequency is too fast. We can see it as a constant state from human eyes.
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Type : Voltage Regulator
Origin : Mainland China