Hello all,
Hello forum, first post!
I am trying to find a solution to switch a relay on using 2 different sources.
I have a 12v relay which I'm energising the coil from a 12v switch on the coil, then I need to use a NPN (Bc107) to maintain the voltage on the coil when the switch is turned off (so the relay is still closed). The NPN is controlled from a 5V PIC pin. On the collector I have 12v but when I drive the base I only seem to have 4v passing.
Please help.
Jason.
Hello forum, first post!
I am trying to find a solution to switch a relay on using 2 different sources.
I have a 12v relay which I'm energising the coil from a 12v switch on the coil, then I need to use a NPN (Bc107) to maintain the voltage on the coil when the switch is turned off (so the relay is still closed). The NPN is controlled from a 5V PIC pin. On the collector I have 12v but when I drive the base I only seem to have 4v passing.
Please help.
Jason.