WebElectrical Relay Definition. Relays are electrically operated switches that open and close the circuits by receiving electrical signals from outside sources. Some people may associate … WebFinally, it may be that the relay board logic, if there is any logic circuit on the relay board, will tolerate 3.3 volt logic. That is, have a low enough turn on threshold to work with either 3.3 volt logic or 5 volt logic. However, such a relay board would be more susceptible to noise (falsely turning on) when driven by a 5 volt signal.
What is an Electrical Relay? OMRON Electronic Components
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