How to use BJT as a switch? | PNP BJT as a High side switch | PNP BJT
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- เผยแพร่เมื่อ 19 มิ.ย. 2024
- #foolishengineer #Transistor #BJTSwitch
0:00 Skip Intro
00:23 NPN BJT High side switch
00:45 High side switch simulation
02:23 NPN BJT limitations
02:47 PNP BJT
03:10 PNP BJT in a circuit
04:53 Circuit working
05:55 Simulation
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Very well done video!
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bro you rock!
Thank you so much for watching!! Please don't forget to subscribe to our channel
💞deep knowledge share 💞
So nice of you!
Very good sir
Thank you so much for watching, please dont forget top subscribe to my channel!!!
You have R3 and R4 the wrong way round in your description at around 5 mins, compared to where they are in the diagram
but the correct way in the simulation :)
When you say that R4 is the pull-up resistor for Q1, don’t you mean R3? Otherwise I don’t understand. But then I saw that R3 and R4 had switched places from the 1st layout to the simulating program.
You are correct
What if we connect the base of the PNP transistor directly to the microcontroller's pin through a resistor? That would eliminate the need for the NPN transistor.
Nice option, but connecting MCU directly to the supply is dangerous. we can't put our brain of the system in compromising situations
It doesn’t work, you need to get the base of the pnp to ground to get it working
@@FoolishEngineer Why the supply get's connected to uC? If you use a pull up resistor (10k) in the PNP-s E-B, and the base connected with a small (
How do we calculate R3 and R2 and can you pls tell the exact requirement of R3
R3 pull up resistor and R2 pull down resistor
Is there any problem with npn as low side switch
both NPN & PNP have their own advantages
Sir i didn’t understand that why we use R2 and R3 resistors ?
Please don't call me Sir.
R2 is pull down resistor for base of NPN BJT. It prevents the floating state when the MCU turns off the signal. And R3 is current limiting resistor for Q1, it is a pull up to turn off Q2
@@FoolishEngineer thank you so much Your videos are really good
@@FoolishEngineer wrong. R3 is pullup for Q1. R4 is current limiting,
R3 is the pull up resistor not R4.
exactly
Pls tell how much resistance and its calculation
please check the references