CodePudding user response:

Common circuit I do not know to ask shrimp, shrimp,

CodePudding user response:

You the Vcc power supply circuit, relay control signals are received diode (LED) grounding, able to work?

CodePudding user response:

This design feel very strange, such as the second floor, not a limited flow resistance LED? D1 connection also pretty strange, directly and the coil, this circuit can be baidu, a lot of,

CodePudding user response:

D1 so pick a line still, D2 and D3 has a problem, to add current limiting resistor, barely speak principle, p2 is input, p1 is output, relay_ctl for low, relay_on grounding, low level, relay_off dangling state, relay_ctl is high, relay_on dangling state, low level, relay_off grounded

CodePudding user response:

This design doesn't work, the working state of the Q1, VCC power supply directly in the relay coil, again a collector from Q1,