Intermittent switch is the kind of automatic power for a certain time and automatically power off a certain time switch. Where can I buy?
Auto parts inside the intermittent scraping rain relay, do not know for you use it.
Buy a timer socket, the kind of electronic, transferred into a cycle.
The CC4060 is a CMOS integrated circuit with an oscillator and a 14-bit binary count / divider. The output terminals Q4 to Q14 constitute a division coefficient of 16 to 18384, and the electronic timer for various applications can be easily designed using the output characteristics.
The following figure shows the automatic cycle timer circuit. The principle is simple, high reliability, the resistance of the oscillation circuit / capacitor slightly adjusted, or change the Q4 ~ Q14 output control wiring, you can get the required cycle waiting time and working time.
Circuit principle is as follows: Resistor R1, R2 and C1 constitute the oscillation circuit, cycle T = 2.2R2C1. R7, D1, J1 and Q1 constitute the drive circuit to control the relay contacts on / off. C3, C5, R3, Z1, BR1, etc. constitute a capacitor step-down circuit, providing 12V DC power supply.
After the power is turned on, the binary counter of the CC4060 starts counting, and the falling edge of the previous stage triggers the post-stage to divide the count.
D2, D3, D5 and R9 are connected to the AND circuit to obtain a high level of cyclic reset, resetting the counter. Re-enter the next timing cycle. The timer has a waiting time of T1 = T × 214/2 seconds, and the operation is turned on for T2 = T × 210/2 seconds. The cycle time is T1 + T2.
Appropriate selection of C1, R2 parameters can be the corresponding oscillation frequency. The timer's waiting time and action turn-on time can be changed accordingly. At the same time, changing the output (Q14) and its control (Q10) can also change the waiting time and the operation on time, as well as its duty cycle, depending on the needs.
According to the icon parameters, you can create an automatic cycle timer to control the indoor fan. Waiting time is three hours, action time is 20 minutes.
