DC 5-15V NE555 Frequency Duty Cycle Adjustable Pulse Generators Rectangular Square Wave Signal Generator 555 Board NE555P Module
NE555 Pulse Generator Pulse Starter Duty Cycle and Frequency Adjustable Module Oscillator Square Wave Signal Generator DIY Kits
Main chip: NE555
Input current: >= 100MA
Output amplitude: 4.2V V-PP to 11.4V V-PP (different input voltage, the output amplitude will be different)
Maximum output current: >= 15MA (5V supply, V PP greater than 50%), >= 35MA (12V supply, V PP greater than 50%)
Output frequency range optional: LF file: 1Hz~50Hz, if system file: 50Hz~1kHz, high frequency file: 1KHz to 10kHz, HF file: 10kHz~200kHz
Input voltage: 5V-15VDC (when the power supply is 5V, the output current can be about 15MA, when the power supply is 12V, the output current is about 35MA)
Output frequency adjustable:
1. If booth C = 0.1UF
2. At low profile, C = 0.001UF
3. High frequency file C = 1UF
4. Period T = 0.7 (RA + 2 RB) C
5.RA, RB are adjustable from 0-10K
6.HF gear C = 100UF (this can calculate the frequency of the waveform)
Mainly used for battery (9V or 12V) voltage monitoring, simple and practical, with sound and light alarm prompts.
After the battery is under voltage, the buzzer will make a sound of "dididi", and the red LED indicator will light up. When the battery voltage rises above the set value by itself, the buzzer will stop alarming.
Size: 3.0CM length * 2.9CM width * 1.4CM height
Fixed hole distance: 2.2CM fixed hole diameter 3MM
9V battery: When the battery is over-discharged (battery voltage is lower than about 8V), the red indicator light will be on and the buzzer will beep, and the sound and light alarm will be realized, so as to realize the control of the battery discharge state to prevent the battery from being over-discharged and damaging the battery.
12V battery: When the battery is over-discharged (battery voltage is lower than about 10.4V), the red indicator light will be on and the buzzer will beep, realizing sound and light alarm, so as to realize the control of the battery discharge state, so as to prevent the battery from being over-discharged and damaging the battery.
1. With sound and light alarm, it is clear whether there is a protective effect.
2. The module input has reverse connection protection, and the polarity of the input power supply will not be burned out. But there is no overvoltage protection, if the input exceeds 15V, the chip on the module will burn out.