check my spec sheets?! you can't make me, you're not my dad! :-D it's hard to quiet my head down. thinking of how to use the 3.3v GPIO on my ESP3622 on a PNP transistor to source from 24v through a motor has been making my head go quiet. i've been googling and reading for a week, and your diagram at 8:44 finally makes sense to me. now my brain is alive with such high quality thoughts as, "mustachioed yachtsman" and "balloon laundry" ah, that's way more clear. back to normal! :-P thank you so much!

you tell it like it is no conventional current confusion. think i finally got it. great work.

Excellent tutorial. I'm going to have to watch this several times. I'm trying to get a triple half bridge transistor circuit working so I can test a sensorless bldc motor driver I'm working on.

Resistor will conusme 1.65 w of power

Thank you. Conventional current is making it very difficult to learn this subject . Been trying to teach myself for a long time and its caused a lot of confusion. They say it makes no difference but i find that it does, especially with semiconductors. So its good to be shown whats really going on in a circuit for a change.

OMG.. negative electrons moving, the only way to think...:) love these videos. i have a LC-V2F with a LM331 chip, no schematic OC-OUT is NPN common cathode, this will help. thanks a lot...:)

First of all, great videos. I really enjoyed your videos. But what bothers me, is that you insist that the current flows from negative to positive. Although that this is true, electrons flow from negative to positive. All the symbols and terminology is based on the current flow from positive to negative. ie. Sink as in go downwards to ground, source as in flow outwards of positive. If you would teach this "wrong" it would be easier to understand the current flows as in a transistors the arrows would point in the right direction.

Useful tutorial 👍

hi, what the formula to calculate the base resistor for BD19 medium power NPN transistor and C9013 NPN small signal transistor?

It's a very good explanation of how the transistors are working, I really liked it! One question: in the example beginning from 8:20, when the 5V is coming from the arduino, why should we substract 0.6 volts from that 5? Thank you!

Very helpful 👍

Coherent tutorial. I like it. I also like the drive: check your spec sheets. at 3:08 . :)

OK, probably a dumb question and maybe I missed something along the way, but WHY would I want to use both a PNP and an NPN transistor to drive a motor? I could do the same thing with two NPN transistors and achieve the same level of amplification, right? The only difference that I see is that the motor is connected on the low side as opposed to the high side which would otherwise be the case if using a pair of NPNs. So the only reason I can think of doing it this way would be to protect from a possible short to ground on the motor.

Thanks for these video series. I'm realy new to electronic and I still have some problems with the basics of transistors. Each time I do the math, half the time I'm wrong and I not always understand why. As example, in the "PNP Darlington Transistor with NEG common", I do the math as here under : R1=10.3/(5A/1000) = 2060 Ohms (so we choose a smaller value 2K) R2=4.4/(5mA/100) = 88000 Ohms and here I don't understand why you choose 2.2K that is far from the calculated value. Is it a mistake or is there a common explanation that I do not know ? Thanks for your help ;)

Can you anyone explain the Q2 ib calculation? Why 3A/2000? Why 3A needs to go to Ic of Q2?

I have a question. Is the device being powered supposed to share ground with arduino? I have circuit similar to the one at 8:52 and it's not working even when i skip NPN and bridge PNP with board's ground altogether.

amazing learn

Links: Using the ULN2003A Transistor Array with Arduino Using the ULN2003A Transistor Array with Arduino www.bristolwatch.com/ele/uln2003a.htm ULN2003A Darlington Transistor Array with Circuit Examples ----- Using the TIP120 & TIP120 Darlington Transistors with Arduino Using the TIP120 & TIP120 Darlington Transistors with Arduino www.bristolwatch.com/ele/tr3.htm Tutorial Using TIP120 and TIP125 Power Darlington Transistors ----- Using Power MOSFETS with Arduino Using Power MOSFETS with Arduino www.bristolwatch.com/ele/tr2.htm N-Channel Power MOSFET Switching Tutorial www.bristolwatch.com/ele/tr1.htm P-Channel Power MOSFET Switch Tutorial ----- Using PNP Bipolar Transistors with Arduino, PIC Using PNP Bipolar Transistors with Arduino, PIC Using NPN Biploar Transistors with Arduino, PIC Using NPN Biploar Transistors with Arduino, PIC www.bristolwatch.com/ele/tr4.htm Understanding Bipolar Transistor Switches ----- How to build a Transistor H-Bridge for Arduino, PIC How to build a Transistor H-Bridge for Arduino, PIC www.bristolwatch.com/ele/tr5.htm Build a High Power Transistor H-Bridge Motor Control www.bristolwatch.com/ele/tr6.htm Driving 2N3055-MJ2955 Power Transistors with Darlington Transistors ----- Build a Power MOSFET H-Bridge for Arduino, PIC Build a Power MOSFET H-Bridge for Arduino, PIC www.bristolwatch.com/ele/h_bridge.htm H-Bridge Motor Control with Power MOSFETS www.bristolwatch.com/ele/tr7.htm More Power MOSFET H-Bridge Circuit Examples

Should I put a pull-up resistor on the base of Q1 and a pull-down on Q2?

You are a GOD!

Hi Lewis, as well as an excellent electronics video blog, I am totally fascinated by your articles/blogs on Christianity and Christian theology. As a Muslim, we always believed that Jesus was a Jew, was born a Jew- from a mother of Jewish descent. In his life time Jesus did not hear of the term "Christians or Christianity" and in fact its was Paul (known as Saul) who instigated and propagated the idea of Christianity.

Ok

Electron flow is correct. But today I use conventional because of what is taught today. See the following on this issue: kzfaq.info/get/bejne/eM54h7V-rL6zZ4U.html MOSFETs and electron flow.

tldr: electronic hiss electronic hiss mouth noise electronic hiss electronic hiss mouth noise. please just kill me.