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The basic relay carrier board makes it easy to incorporate a “sugar cube”-style power relay into your electronics project. An integrated MOSFET allows the relay to be controlled with a low-current digital input, and a pair of indicator LEDs show when the relay is activated.
The control signal is fed directly to a BSS138 N-channel MOSFET, which in turn actuates the relay coil when the signal voltage exceeds approximately 2.5 V (see BSS138 datasheet for details).
The three control pins have a 0.1″ spacing compatible with standard solderless breadboards and servo cables, and the switch pins are available for use with 5mm-pitch terminal blocks or 0.2″-spaced pins.