Designing a PIR Motion Sensor w/ BC-547 Transistor

AI Thread Summary
Designing a PIR motion sensor using a BC-547 transistor is feasible, and the discussion centers on the suitability of class-A amplifiers for amplifying the sensor's output to an alarm circuit. Class-A amplifiers are considered appropriate for this low-power application, providing the necessary amplification without significant distortion. Participants question the rationale behind choosing or avoiding class-A topology for this purpose. Overall, the design approach appears sound, emphasizing the compatibility of the chosen components. The conversation highlights the importance of selecting the right amplification method for effective sensor performance.
suryakalpo
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I'm planning to design a PIR motion sensor. I wanted to know if I can use ordinary class-A amplifiers to amplify the output of the sensor which will be given to the alarm circuit. The transistor I'm planning to use is BC-547
 
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suryakalpo said:
I'm planning to design a PIR motion sensor. I wanted to know if I can use ordinary class-A amplifiers to amplify the output of the sensor which will be given to the alarm circuit. The transistor I'm planning to use is BC-547

Sure.

Is there a reason you wouldn't want to use a class-A amplifier topology? This is all low-power...
 

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