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3A @125V AC
Power-up Timer (PWRT) and Oscillator Start-up Timer (OST)
as well as a B-type USB Connector for power and separate LEDs for power and programmer status
It has a small size
And if LED blinks twice in 1 second then the module is in data mode and connection is successful
T90 30A 6V Relay Module MQ-3 Gas Sensor Module 3A @125V ACIts a relay module, its used in electronic circuit as a switching device this module has the pins which is for Signal, GND, VCC. T90 relay is a type of coil relay which is used to provide protection to the electronic circuit. this relay has three output pins NO, NC, COMMON. its operating voltage is 5V and the current is 30A, NC's and NO's operating current are different 20A, 30A. This module has two LED first one is Red and second one is Green in
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