Hey Guys,
I am designing a circuit that will require a PIC16F877A to comunicate with another pic and the pc through serial communication. I want to be able to control a certain portion of the circuit and be able to cut power to it. I am currently using a 2n3904 as a switch, the base is connected to my microcontroller pin through a 10k resistor and there is a pull down resistor of 100k also. All the negative connections of that portion of the circuit are connected to the collector of the 2N3904 and the emitter to the circuit ground.
For some reason the transistor is not working, it says it can handle up to 200 ma of current and my circuit is putting out less then 150 ma. Should I be using a relay for this and controlling this relay with the transistor switch?
I have attached an image of the schematic, the highlighted blue line are the negative connections of the circuit I want to control.
Thanks
I am designing a circuit that will require a PIC16F877A to comunicate with another pic and the pc through serial communication. I want to be able to control a certain portion of the circuit and be able to cut power to it. I am currently using a 2n3904 as a switch, the base is connected to my microcontroller pin through a 10k resistor and there is a pull down resistor of 100k also. All the negative connections of that portion of the circuit are connected to the collector of the 2N3904 and the emitter to the circuit ground.
For some reason the transistor is not working, it says it can handle up to 200 ma of current and my circuit is putting out less then 150 ma. Should I be using a relay for this and controlling this relay with the transistor switch?
I have attached an image of the schematic, the highlighted blue line are the negative connections of the circuit I want to control.
Thanks
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