Relays that normally used in electronic circuits are SPDT and DPDT types due to their flexibility in controlling circuit switching. In the next section, a demonstration on identifying the pins of a relay from SPDT or DPDT type without referring to its datasheet will be illustrated. A 5-pins type relay, a 6-pins type relay and an 8-pins type relay will be used in this demonstration.
Relay have become a common use electronic component which operate as an switching device by simply apply voltage to ON and OFF it. For this project, we will discover a simple relay connected with an LED to show what is the basic function and connection.