Reed Relay Circuit Diagram. This area as expected is a mostly parabolic field. In the second schematic we apply a dc voltage to the coil therefore a magnetic field is produced and the contacts close allowing the current to flow from the battery to the led turning it on.
The reed switch is a simple device and relatively low cost to manufacture. The circuit diagram below shows how each reed relay connects to the arduino. It can therefore be powered directly from the 5v output.
As you can see above in the first schematic no voltage is applied to the coil so the reed switch is opened and the led is not turned on.
Reed relays contain a reed switch a coil for creating a magnetic field an optional diode for handling back emf from the coil a package and a method of connecting the reed switch and the coil to outside of the package. They require a much lower level of power to actuate them than other traditional types of relay and as a result they find many uses in various forms of electronic circuits. Charging discharge voltage monitor test relay switch control board module dc 12v at affordable s free shipping real reviews with photos joom. Circuit diagram electric electronic reed relay.