I have no kind of knowledge about these things. I just copied some instructions from different projects and now my project died.
I have this 12V 0.8A solenoid that switched for about two weeks. Now the switch gives 2mV to the solenoid.
I measured a new transistor between base and emitter and I got 5.5kOhms. The one that is inside the circuit gives 12.5kOhms. The resistor is still 10k.
I am thinking maybe the 10k resistor was too much or the transistor had too much heat.
The thing is I have a headache from all the reading and would appreciate if someone would help. How do I solve it?
Edit1: If I measure the power supply alone I get 30V, but if I measure it while powering the solenoid directly it's just 14V and it works. Edit3: It turns out (after the discussion) that the signal should have been (and was and is again) 5V. I thought the problem was that I overloaded something but is not. Now that I know I need a higher current at the base I know what to measure in the future. So my problem was the 2mV current I measured when someone asked me.