A time relay is an electrical component used on a circuit with a lower voltage or a lower current to turn on or off a circuit with a higher voltage and a higher current. At the same time, the time relay is also a control appliance that uses electromagnetic or mechanical principles to implement time-delay control. There are many types of it, including air damping type, electric type and electronic type.
Air damping time relay is also called airbag time relay. It delays according to the resistance generated by air compression. Its structure is simple, the price is cheap, the delay range is large (0.4 ~ 180s), but the delay accuracy is low .
The delay time of the electromagnetic time relay is short (0.3 ~ 1.6s), but its structure is relatively simple, and it is usually used in power-off delay occasions and DC circuits.
The principle of the electric time relay is similar to that of a clock. It is delayed by the internal motor driving the reduction gear to rotate. This relay has high delay precision and a wide delay range (0.4 ~ 72h), but the structure is relatively complicated and the price is very expensive.
Transistor time relay is also called electronic time relay, it uses delay circuit to delay. This relay has high accuracy and small size.
A buzzer or beeper is an audio signalling device, which may be mechanical, electromechanical, or piezoelectric (piezo for short). Typical uses of buzzers and beeper include alarm devices, timers, and confirmation of user input such as a mouse click or keystroke.
Piezo Buzzer,Dc Electro Magnetic Buzzer,Buzzer Acoustic Components,Piezo Buzzer For Thermometer
Jiangsu Huawha Electronices Co.,Ltd , https://www.hnbuzzer.com