12V open relay switch module delay (1-10 seconds) adjustable

A brief description】

First, the size: 6.8CM * 2.1CM

Second, the main chip: NE555

Third, the working voltage: DC 12 volts

Fourth, the characteristics: 
1, the power supply relay immediately pulls in, then delay 1-10s to open.Specifically: after the relay is supplied with 12v power, the relay will immediately pull in. The state of the relay output is: normally open and common conduction, normally closed and public disconnected; wait until the delay is 1-10s (can be adjusted), the relay is disconnected. At this time, the state of the relay output is: normally open and public disconnect, normally closed and common conduction; as long as the module is continuously powered, this state will be maintained. 
2, delay time adjustable, (0 ~ 10 seconds)                
4, increase the potentiometer can increase the delay time 
5, increase the capacitance C1 can increase the delay time 
6, with input power indicator 
7, with relay pull-in indication light

8, can control the exchange 220V/10A equipment. (Maximum control device 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