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The basic SPDT relay carrier with 5V DC relay allows simple control over single pole double throw switches with low voltage and low current control signals. Included is the carrier board (PCB), with a pre-soldered 5V relay, 5.00mm terminal block for switch connections, and straight 0.1" (2.54mm) male headers for control over connections. The relay is a Omron G5LE-14-DC5.
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 2.5V (see BSS138 datasheet for details).