I have this simple circuit to drive a 5v solenoid. I made it all except that Q1 is a C2328A transistor I pulled out of an old power supply and C2 is a 220uF cap. D1 is just a diode I took out from another power supply, not sure what it is.
Basically the solenoid rings a bell. THis worked for about 2 weeks but now it will ring once (2 rings) then the next time only 1 ring and its dead. The solenoid will just not move anymore though the program is running and is triggering the transistor.
It works of USB power and is triggered by RTS using a USB to SERIAL dongle. The COM port stays reactive.
I wonder if this circuit is flawed and possibly caused damage to the cap or the transistor?