If you are getting that means your circuit is working properly and you need to replace the relay with another 5v relay. Take a Multimeter and place its positive knob between the 4th pin of 555 IC and another to the ground. In this case, you have to check whether you are receiving the desired output or not. Cross-check the soldering joints if you have missed anything to solder. You must check all the connections as per the circuit diagram. You can use the screwdriver to turn the potentiometer knob. Take a stopwatch and set it to a position where you are getting the desired time delay. If so, adjust Potentiometer within your range. Troubleshooting The Circuit is taking so long to respond? The terminal block is connected with the common point of the relay and normally open (NO) of the relay. The collector of BJT is connected to one coil terminal of the relay and another coil terminal is connected to the positive 9v battery. Another end of the potentiometer is connected to a 9v battery. 6 is connected to the potentiometer and also connected with the positive electrolytic capacitor. Pin no.5 is connected to the ceramic capacitor and another end of the ceramic capacitor is connected to the negative of the battery.

Pin no.3 is connected to the base of the transistor with the help of a 1K resistor. Pin no.2 is connected to the positive of the battery with the help of a 10K resistor. Pin No.2 is connected to the push button and is connected to Pin no. In the above circuit, we can see that Pin no.1 of the timer IC is connected to an emitter of the NPN transistor and connected to the negative of the electrolytic capacitor, and also connected to the push button. The relay we have used is 5Volts / 7.5A rated.Ĭomponents Required for Automatic Power Cut-off Circuit Relays have a range of applications such as home automation, automobiles, industrial applications, DIY Projects, and a lot more. When supply is given to terminals of the coil it gets converted into an electromagnet and operates between NO and NC conditions. One is a common point and another two are normally open (NO) and the other is normally closed (NC) terminal.Ī relay uses an electrical signal to control a coil in form of an electromagnet, which in turn connects and disconnects a circuit. This switching is done with the help of a coil inside a relay. In whole, it consists of 2 comparators, a flip flop, a voltage divider, a discharge transistor, and an output stage.Ī Relay is an electromechanical switch that connects and disconnects two circuits.

555 timer IC has 35 transistors, 2 diodes, and 15 resistors within it. It is a highly stable integrated circuit that can produce accurate time delays. It can be found in many electronic devices starting from toys and kitchen appliances to even spacecraft. It is an 8-pin IC that have many applications.

Power on time delay relay circuit 110v