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I am making a burglar alarm system for my high school project. It uses a PIR sensor, a piezo buzzer, switch, battery, transistor, resistor and an LED. However, I have a 9V battery and a MPS2 222 AAAA transistor instead of the recommended BC 547 one for these kinds of projects. I wanted to know if I can still use the MPS2 transistor with a 9V battery and what will be the recommended resistance for the circuit? 
I am making a burglar alarm system for my high school project. It uses a PIR sensor, a piezo buzzer, switch, battery, transistor, resistor and an LED. However, I have a 9V battery and a MPS2 222 AAAA transistor instead of the recommended BC 547 one for these kinds of projects. I wanted to know if I can still use the MPS2 transistor with a 9V battery and what will be the recommended resistance for the circuit?
I am making a burglar alarm system for my high school project. It uses a PIR sensor, a piezo buzzer, switch, battery, transistor, resistor and an LED. However, I have a 9V battery and a MPS2 222 AAAA transistor instead of the recommended BC 547 one for these kinds of projects. I wanted to know if I can still use the MPS2 transistor with a 9V battery and what will be the recommended resistance for the circuit?
Need Help- Burglar Alarm System
I am making a burglar alarm system for my high school project. It uses a PIR sensor, a piezo buzzer, switch, battery, transistor, resistor and an LED. However, I have a 9V battery and a MPS2 222 AAAA transistor instead of the recommended BC 547 one for these kinds of projects. I wanted to know if I can still use the MPS2 transistor with a 9V battery and what will be the recommended resistance for the circuit?