====== NE555 Pulse Module LM358 ======
Size: 31mm x 11mm x 23mm/1.21" x 0.43" x 0.89" (inch) (approx)
　
Application scope:

  - Used as a square wave signal generator produces a square wave signal for the experimental development use.
  - A square wave signal is used to produce a stepper motor-driven drive.
  - Produce the adjustable pulse for MCU use.
  - Generates the adjustable pulse to control the associated circuits.
　
Descriptions:

  - The main chip: LM358.
  - Input voltage: 5V-12VDC.
  - The input current: ≥ 100MA.
  - The output amplitude: close to the input voltage.
  - The frequency adjustment range: 0.07HZ-2KHZ (also cycle in about 0.45ms to 15s).
  - Duty cycle adjustment range: 0% to 100% (High / cycle).
  - Output Current: strip 9012 transistor drive capability is strong, about 500MA output current, the output can directly drive small relays or small motors.
 
{{ .ne555-map.jpg |Detailed map}}
Frequency adjustment methods:

  - The board has four the shorting cap can select the frequency.
  - Inserted 0 short-circuit cap, the longest cycle upwards to 0.3 s.
  - Inserted one short-circuit cap, the longest cycle can be adjusted to about 4s.
  - Inserted two short-circuit cap, the longest cycle can be adjusted to about 7s.
  - Inserted three short-circuit cap, the longest cycle can be adjusted to about 10s.
  - Inserted four short-circuit cap, the longest cycle can be adjusted to about 15s.
  - Duty cycle adjustment range: 0% to 100% (High / cycle).
  - Output Current: strip 9012 transistor drive capability is strong, about 500MA output current, the output can directly drive small relays or small motors. 
{{ .ne555-diagram.jpg |Circuit Diagram}}