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BACK EMF PROTECTION CIRCUIT OF RELAY

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  Protection is assured through disconnecting power supply in a circuit  by  over current protection , which removes fire hazards and protect the components from burning out.   Circuit protection , at its simplest, is the intentional addition of a 'weak link' in an electrical circuit . This link will break in the event of a fault – whenever there is high temperature, excessive current or a short circuit in a conductor, thus protecting the electrical circuit from damage.   Circuit connection  Description Here we are trying to implement the protection circuit that is used to protect the opamp from back EMF when it is connected directly with the relay. So for protection of opamp we will use transistor (BC547) for switching, this switch will turn on when the opamp will give output. At that time flow of circuit connection will be from collector to emitter due to which relay turns ON. But we know that the coil of relay is responsible for back EMF...
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EMBEDDED SYSTEM

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