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DC 5V 12V 24V 4 Channel Voltage Comparator LM393 Relay Board (5V with box)
- Function: the setting voltage reference input of a voltage and on the module (reference voltage can be set through the adjustable resistor) comparison, when the input voltage is greater than the reference voltage, the relay is closed (10-9 closed, 10-11 disconnected), when the input voltage is less than the reference voltage, the relay does not operate.
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