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1 Channel 5V Relay Module 1-Channel realy KY-019 1 ,New 5V Relay Module 2 , can be used as microcontroller development board module can be used as home appliance control 3,5 V-12V to TTL control signal 4, the control signal DC or AC , 220V AC load can be controlled . 5, there is a normally open and one normally closed contact 6 , a power indicator light 7 , a control indicator , pull off, disconnect does not shine 8 , transistor drive to increase the relay coil control pins high impedance. 9 , the control pin has a pull-down circuit to prevent malfunction relay vacant
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