Description: NE555 Pulse Module, adjustable frequency module. Used as a square wave signal generator produces a square wave signal for the experimental development use. Used to generate the square wave signal to drive a stepper motor drive. Produce adjustable pulse for the MCU to use. Generating adjustable pulse to control the associated circuits. Specification: Size: approx. 2.9 x 3.6cm; The fixed hole distance is 22.5mm and 30.5mm The main chip: NE555 Input voltage: 5V-15VDC. 5V power supply, the output current can about 15MA; 12V power supply, the output current can be so 35MA; Input Current: ≥100MA Output amplitude: 4.2V V-PP to 11.4V V-PP (depending on the input voltage, the output amplitude is not the same) Maximum output current: ≥15MA (5V power supply, V-PP greater than 50%); ≥35MA (12V power supply, V-PP greater than 50%) Advantages: -Output with LED indication, (low level: LED light on, high level: LED goes off, low frequency: LED flashes) -Output frequency range grade optional continuously adjustable output frequency; -Low frequency: 1Hz ~ 50Hz -Middle frequency: 50Hz ~ 1kHz -Medium-high frequency: 1KHz ~ 10kHz -High-frequency: 10kHz ~ 200kHz -the output frequency is adjustable -Cycle T = 0.7(Ra + 2Rb)C -Ra, Rb: 0-10K adjustable -LF C = 0.001UF - C = 0.1UF -MID HF C = 1UF -HF C = 100UF, so the waveform frequency buyers can own calculations. Package Includes: 1 Piece NE555 Pulse Module (7 Pack) Note: Color maybe slightly different due to different monitor. The above size is measured by hand, please allow slightly difference. Thanks!