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
Messages
13
Reaction score
0
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
 
Engineering news on Phys.org
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...
 

Thread 'Underwater piezoelectric sensor array receive sensitivity'

Hi all I have some confusion about piezoelectrical sensors combination. If i have three acoustic piezoelectrical sensors (with same receive sensitivity in dB ref V/1uPa) placed at specific distance, these sensors receive acoustic signal from a sound source placed at far field distance (Plane Wave) and from broadside. I receive output of these sensors through individual preamplifiers, add them through hardware like summer circuit adder or in software after digitization and in this way got an...
View full post »

Thread 'Following up on the recent thread about Earth Resistance measurements'

I have recently moved into a new (rather ancient) house and had a few trips of my Residual Current breaker. I dug out my old Socket tester which tell me the three pins are correct. But then the Red warning light tells me my socket(s) fail the loop test. I never had this before but my last house had an overhead supply with no Earth from the company. The tester said "get this checked" and the man said the (high but not ridiculous) earth resistance was acceptable. I stuck a new copper earth...
View full post »
Thread 'Electromagnet magnetic field issue'

Thread 'Electromagnet magnetic field issue'

Hi Guys We are a bunch a mechanical engineers trying to build a simple electromagnet. Our design is based on a very similar magnet. However, our version is about 10 times less magnetic and we are wondering why. Our coil has exactly same length, same number of layers and turns. What is possibly wrong? PIN and bracket are made of iron and are in electrical contact, exactly like the reference design. Any help will be appreciated. Thanks. edit: even same wire diameter and coil was wounded by a...
View full post »

Similar threads

Is My ESP32-Cam + PIR Sensor + FTDI Assembly Correct According to Diagram?
Replies
7
Views
2K
PIR Motion Sensor with Analog Output
Replies
7
Views
7K
Eddy current position sensor circuit
Replies
5
Views
2K
Mosfet, Mesfet vs Bipolar transistors in RF circuits
Replies
28
Views
5K
Class A Amplifier Sinusoidal Input/Output Relation
Replies
3
Views
3K
How to design discrete circuits for transistor beta changes?
Replies
4
Views
2K
What does this DC motor supply do?
Replies
9
Views
2K
Don't know how to make an ultrasonic sensor circuit....
Replies
1
Views
2K
Is 500 Watts Typical for Toilet Motion Sensors? Experts Answer Ramone
Replies
5
Views
2K
Why do we need multiple amplifier stages in electronic circuits?
Replies
33
Views
4K

Hot Threads

Recent Insights

Back
Top