Characteristics of NE555 pulse generator moduleNE555 frequency adjustable pulse generator module, the default delivery frequency range is 2k-25khz, and the frequency range is determined by the capacitance C1. You can change the adjustable range by changing the C1 capacitance, and the capacitance increases and the frequency decreases. Be careful not to over-current the signal output, otherwise the chip will be damaged. Add a current limiting resistor to the output to prevent overload damage.Product parameters1. On board NE555 chip2. Single channel signal output, output square wave with duty cycle of about 50%3. On board adjustable resistance, the output frequency can be controlled by adjusting the resistance value, and the default range is 2k-25khz4. Working voltage: 5V-12V5. Board size: 25mm*13mm

Product parameters1. Size: 40mm*20mm2. Function: square wave or rectangular wave of different frequencies3. Power supply: when the input voltage is 5-12vdc and 5V power supply, the output current can be about 10mA; when 12V power supply, the output current can be about 30mA4. Frequency: 5 frequency bands (measured value)J1 gear: 0.6hz-25hzJ2 gear: 7hz-300hzJ3 gear: 50hz-2.5khzJ4 gear: 350hz-6.6khzJ5 gear: 6.7khz-180khzAdjustable duty cycle range: 0.4-0.995. LED output indication: when the LED is on at low level, the LED is off at high level, and the speed of LED flashing indicates the change of frequency output. Except that different frequency bands can be selected for cap skipping, rv1 adjustment can adjust the frequency. The flashing of LED in frequency adjustment can be regarded as the frequency change corresponding to the adjustment change6. Input current: ≥ 100mA7. Output voltage: 4.2v-11.4v peak value (varying with supply voltage)8. Output frequency calculation formula: period t=0.7 (ra+2rb) C RA and Rb are 0-10k adjustable9. Input: VCC GND output: VCC out GND. The input voltage here is consistent with the output for the convenience of users. It can be used for subsequent power supply. Out is the output frequency signal

Product parameters1. The output is provided with LED indication, and it is clear whether there is output (the LED quantity at low level, the LED at high level is off, and the LED flashes when the frequency is relatively low)2. The output frequency range and grade can be selected to make the output frequency more continuous and adjustable;Low frequency range: 1hz-50hzIntermediate frequency range: 50hz-1khzMedium and high frequency range: 1khz-10khzHigh frequency range: 10khz-200khz3. The output duty cycle can be adjusted slightly. The duty cycle and frequency are not adjustable separately. Adjusting the duty cycle will change the frequency4. Output frequency adjustable: cycle t=0.7 (ra+2rb) C RA and Rb are 0-10k adjustable; C=0.001uf at low frequency; C=0.1uf at intermediate frequency; C=1uf at medium and high frequency; C=100uf at high frequency; When 5V power supply is applied, the output current is about 15mA; when 12V power supply is applied, the output current is about 35mA, 5v-15vdc