【A brief description】

1. Size: 6.8CM*2.1CM

2. Main chip: NE555

3. Working voltage: DC 5V 12V

4. Features:
1. Turn on the power relay to suck and disconnect with a fixed period of 1-10s. Specifically: after supplying 5V 12v power to the relay, the relay will immediately attract and the status of the relay output terminal is: normally open and public conduction, normally closed and public disconnection; after the delay 1-10s (adjustable), the relay Release. At this time, the status of the relay output terminal is: normally open and public disconnect, normally closed and public conduction; as long as the module is continuously powered, this state will always maintain a fixed period of 1-10s to pull in and release.
2. The delay time is adjustable, (0～10 seconds)
4. Adding a potentiometer can increase the delay time
5. Increasing the capacitor C1 can increase the delay time
6. With input power indicator
7. With a relay pull-in indicator

8. It can control AC 220V/10A lower equipment. (Control equipment 2000W)

9. With relay freewheeling protection.

10. Delay time formula: T=1.1RC. For example: capacitance 100uf resistance 100K T=1.1*100000*0.0001=11 seconds

Applicable occasions: MCU learning, electronic competition, product development, graduation design. . .