I have a modem which has a (0v when low, 2.8v when high) digital output.
I have a an external relay module that i want to control with this output. Basically turn on the relay when the output is high.
However i see that whenever i turn my modem output to high, the relay produces a buzzing sound instead. The contacts do not close. I suspect that the signal may be noisy, is there any way to reduce the noise? perhaps with capacitors or something.
Here is my circuit:
I have a an external relay module that i want to control with this output. Basically turn on the relay when the output is high.
However i see that whenever i turn my modem output to high, the relay produces a buzzing sound instead. The contacts do not close. I suspect that the signal may be noisy, is there any way to reduce the noise? perhaps with capacitors or something.
Here is my circuit: