![]() Thanks Due_unto and all, this is making more sense. This protects the transistor from the inductive kickback generated when the current through a coil is interrupted. Note that it is extremely important to connect a diode across the coil contacts such that the diode cathode is connected to the +5V end. ![]() Normally you would not just connect the coil straight to +5 and ground, usually one side of the coil is connected to +5V and the other side to a driving transistor that will supply ground to the coil when switched on by an Arduino, for example. ![]() connected to +5 and ground) the Common contact and Normally Open are closed. With current flowing through the coil (ie. With no current through the coil the Common contact and Normally Closed contact are closed. Top right and bottom right are the Common contactīottom middle is the other side of the coil With your relay sitting pins up in front of you as shown in the diagram with the group of four pins to your left. The following applies only to the Multicomp datasheet you provided, your relay may be different.
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