DIY LM393 Voltage Comparator Module Kit with...

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DIY LM393 Voltage Comparator Module Kit with Reverse Protection Band Indicating Multifunctional 12V Voltage Comparator Circuit
Description: On board, with relay action switch, relay action or reset can be freely chosen. The plate is connected with an anti protection diode, and the power supply does not burn the chip or the circuit. With relay action indicating lamp for convenient
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