I got a very small circuit, and for some reason I am unable to get current out of it:
There is DC 5 volts going thru 1K resistor into the base of TIP31C (NPN transistor), the emitter is GND, and the collector is connected to 15V thru 10K resistor.
The output is between the collector and the 10K.
My purpose is to run DC motor from this 15V output.
Note that since I am getting the output from the collector, it is inverted. I took care of this by having an inverter at the base. So, if the input is 0V, it is inverted to 5V, and the output at the collector will be around zero. If the input is 5V, it is inverted to 0V at the base, so the output at the collector is 15V.
At the output (at the collector) I can actually measure 15V, but with almost no current. I cannot get more than few mA barely enough to provide a very dim light for small LED. I cannot run any motor with few mA.
Is there any reason why there is very little current coming out of it?
I tried two different power sources, and got the same results.
One thing I suspected was that the output of a transistor at the collector is hi-impedance, so I connected second stage with common collector (emitter follower), and I took the output between the emitter and the emitter resistor, but got same result.
I have no idea how to solve this issue.
Thanks for any input.
There is DC 5 volts going thru 1K resistor into the base of TIP31C (NPN transistor), the emitter is GND, and the collector is connected to 15V thru 10K resistor.
The output is between the collector and the 10K.
My purpose is to run DC motor from this 15V output.
Note that since I am getting the output from the collector, it is inverted. I took care of this by having an inverter at the base. So, if the input is 0V, it is inverted to 5V, and the output at the collector will be around zero. If the input is 5V, it is inverted to 0V at the base, so the output at the collector is 15V.
At the output (at the collector) I can actually measure 15V, but with almost no current. I cannot get more than few mA barely enough to provide a very dim light for small LED. I cannot run any motor with few mA.
Is there any reason why there is very little current coming out of it?
I tried two different power sources, and got the same results.
One thing I suspected was that the output of a transistor at the collector is hi-impedance, so I connected second stage with common collector (emitter follower), and I took the output between the emitter and the emitter resistor, but got same result.
I have no idea how to solve this issue.
Thanks for any input.