Happy Store XD - 32 NE555 Pulse Module Upgrade Edition Lm358 Pulse and Square Wave Rectangular Wave Frequency Adjustable Module
main chip: LM358 * input voltage: 5V - 12 VDC * Input current: ≥100MA * output amplitude: close to the input voltage * Frequency adjustment range: 0.07 HZ - 2 KHZ (i.e., cycle around 0.45 milliseconds to 15 seconds).