10Pcs Diy Touch Vibration Alarm Kit Electronic Training Teaching

Working principle : The touching vibration alarm consists of touch trigger circuit, vibration trigger circuit and alarm circuit. The 555 time base circuit U1 forms the typical monostable operating mode. The transient time is determined by the values of RP1, R2 and C2. Usually the circuit is in steady state, 555 time base circuit 3 pin output low, the alarm chip does not alarm because there is no power supply. When the human touch the electrode sheet M, the human body induced by the clutter of the signal injected into the 555 trigger pin 2 through C1, or vibration sensor S1 connect instantly because of the vibration, will both cause the U1s pin 2 to appear instantly low level So that the 555 circuit flip into the transient, pin 3 mutate to high level, alarm chip works. Transient time is over, the time base circuit back to steady state, stop the alarm. The length of the alarm time can be adjusted by changing RP1. LED is a two-color light-emitting diodes, green LED bright after power, use Lees meer over de 10Pcs Diy Touch Vibration Alarm Kit Electronic Training Teaching van huismerk in de productgroep elektronica