Hi folks,
I'm relatively new to creating circuits. I'm trying to drive a very low current (~27mA) Mp3 module and a small DC motor from a PIR running through a TIP31c transistor. The entire circuit is powered from a 5v 2A PC power supply. The PIR outputs 3.3v to switch the base of the TIP31c through a 1K resistor with 5v to the collector. It will power the MP3 but when I attach the motor nothing seems to power up. The DC motor runs on 5v and pulls less than 1A so the TIP31c can easily handle that, however the same circuit with the MP3 removed (trying to run just the motor with the TIP31c and PIR) does not work either...so clearly the addition of the motor is the issue but I'm not sure why, could it be from voltage drop?
I'm relatively new to creating circuits. I'm trying to drive a very low current (~27mA) Mp3 module and a small DC motor from a PIR running through a TIP31c transistor. The entire circuit is powered from a 5v 2A PC power supply. The PIR outputs 3.3v to switch the base of the TIP31c through a 1K resistor with 5v to the collector. It will power the MP3 but when I attach the motor nothing seems to power up. The DC motor runs on 5v and pulls less than 1A so the TIP31c can easily handle that, however the same circuit with the MP3 removed (trying to run just the motor with the TIP31c and PIR) does not work either...so clearly the addition of the motor is the issue but I'm not sure why, could it be from voltage drop?
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