I have a output of .03v from my logic gate but i need it to be 5v to enable my dc motor. How can i amplify it into 5v using a transistor?
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The logic gate is not able to provide enough current and hence the voltage is dropping as motor tries to pull more current. You can use a power NPN Bipolar Transistor (like TIP122) as a switch to drive the motor. Connect the gate output to base of transistor in series with 100 ohms and the motor to collector of transistor. Supply collector with 5 V from external power supply. Ground the emitter. Also add a diode in reverse bias in parallel with the motor for protection.
You could imagine the current the motor requires is somewhat higher than the one your logic gate is able to provide. So this seems to be a current protection inside the ic not to damage it, thus reducing output voltage. In order to drive your motor you could use a transistor, one which is able to work under the current specs of your motor.