“Hi, friends, today i will show how to make buzzer out of relay. Relay is nothing but a switch which is controlled by voltage which we provide. Suppose a relay of 5 volts will act as switch if we provide 5 volts and a little above 5 volts. For this reason it was used as a logic switch in earlier days. In the picture the circuit diagram of relay is shown.Relay is actually single pole double throw(SPDT) switch.”
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