Switching Relay Circuit

A typical relay switch circuit has the coil driven by a npn transistor switch tr1 as shown depending on the input voltage level. This ac power switch circuit senses the presence of ac current in one outlet of a multi outlet power strip and switches power to the remaining outlet s. Link of previous video about types of relays https.

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A relay is an electromechanical device that uses an electromagnet to open or close a switch.

Switching relay circuit. In this video you will get knowledge about basic techniques of relay or operational phenomena of relay. The 100µf capacitor that is connected to the base of the transistor is used to keep a stable base bias of the transistor so that there are no relay clicking. Ldr is connected with variable resistor vr1 and variable terminal connected with operational amplifier inverting input by changing the value of vr1 we adjust the sensitivity level of ldr. When the base voltage of the transistor is zero or negative the transistor is cut off and acts as an open switch.

This ldr switch relay circuit has two sections one is sensor operational amplifier and another one is decade counter to drive the relay. It is mainly used to control a high powered circuit using a low power signal. As the name suggests electromechanical relays are electro magnetic devices. So relay is a switch which controls open and close circuits electro mechanically.

The relay coil is connected to collector of the transistor. Hence the relay coil gets energized when the transistor is switched on. How to make relay switch circuit relay and operating principle pin identification of relay component value calculation and choosing the best for your design. The solid state relay has no moving parts.

Electronic relay switch circuit diagram and its working electromechanical relays. As a result the contacts of the relay switch. It is a purely electronic device there are no moving. It utilizes a current transformer single transistor amplifier voltage doubler detector robust relay and capacitor limited ac power source.

Build your own relay switch circuit as per your requirement. The main operation of this device is to make or break contact with the help of a signal without any human involvement in order to switch it on or off. Schematic of the ac relay switch circuit. The circuit that powers the electromagnet s coil is completely separate from the circuit that is switched on or off by the relay s switch so it s possible to use a relay whose coil requires just a few volts to turn a line voltage circuit on or off.