Adjustable timer switch for NE555 DK555 - 5Pcs delay relay module 5Pcs NE555 DK555 Timer Switch Adjustable Disconnect Module Time Delay Relay Module DC 12V Delay Rel<br> The relay time delay and supply is connected.Specific as follows: for 12 v supply to the relay, relay not immediately and absorption, relay the output status to: normally open and public disconnect, normally closed and public conduction;Wait for delay 1-10 s (adjustable), relay and absorption, at this point, the relay outputs status to: normally open and public conduction, normally closed and public disconnected;As long as the module continuously, this state will remain.<br> The delay time is adjustable, (0 ~ 10 seconds)<br> IKncreasing the potentiometer can increase the delay time<br> the capacitor C1 can increase delay time<br> with input light<br> A relay and indicator lights<br> Controlled ac 220 v / 10 a device.(maximum control equipment 2000 w)<br> Stream with relay protection.<br> The delay time formula: T = 1.1 RC.For example: 100 uf capacitance resistance 100 k T = 1.1 * 100000 * 0.0001 = 11 seconds<br> The on-board equipment on the time delay, prevent excessive current when the car lighter burned on-board equipment.<br> Need to have order to start the occasion, to prevent multiple devices at the same time starting current is too burning appliances.<br> The main chip: NE555<br> Working voltage: DC12V<br> Colour:red+green+blue<br> Material:PC, Metal<br> Size: 6.8 x 2.1cm<br> Package Contents:<br> 5 x NE555 Delay Relay Shield Timer<br> Only the above package content, other products are not included.<br> Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.