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The 5V relay (SRD-05VDC-SL-C) operates from the regulated 3.3V DC supply; This V4.0 module has three 10KΩ pull-up resistors (RESET/GPIO0/CH_PD) A PC817 optocoupler drives the relay control MOSFET ...
see the entire Over-voltage Protection Module to handle direct connection of voltage regulators to a 5V battery using standard 2.5V OD 3.3V devices datasheet get in contact with Over-voltage ...
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