Relay Circuit Diagram. The driven relay can then operate as a switch in the circuit which can open or close according to the needs of the circuit and its operation. Switch the current on or off in the second circuit.
In the above circuit 5v relay is powered by a 9v battery. For mechanical latching relays click here. The relay remembers which switch was pressed last.
The transistor allows the hc11 to control the medium sized coil current of relay.
In the above circuit 5v relay is powered by a 9v battery. It shows the components of the circuit as simplified shapes and the capacity and signal connections between the devices. As relay diagrams show when a relay contact is normally open no there. A relay is an electrically operated switch.