I have a fan cooling a remote base transceiver. The fan is on 24/7. I would like to have the fan on only when the transceiver PTT is active (active low). Alternatively, I would like to have the fan on only when the RB is commanded to RX/TX mode. There must be many simple solutions to this problem, but I am not competent to choose the proper components and design the circuit. The fan operates on 12 volts and draws 250 milliamps when running, perhaps more at start up. If someone can suggest a proper transistor and circuit to turn the fan on and off, I'd appreciate it. Thanks.
John AF4PD
