20 thoughts on “Transistors – Electronics Basics 22 (Updated)

  1. Hi….Electronic Investigation ? If their is 3 branches transistors as shown in fig Q is: possible I=0 IN Middle branch only? I mean practically ! that by math i.e theoretical ….Ali / Baghdad 2019

  2. @1:44 your circuit is incorrect. You show the base/collector junction forward biased and the base/emitter junction reverse biased. Transistors will not work in that state. Your more correct circuit @2:35 would have a transistor failure very quickly since transistors do not like a forward bias of more than about 0.7 volts, maybe a bit more for power transistors. Also you have 12 volts across the LED. That will not last long either.

  3. big wrong. it should be the current flow from base to emitter triggered the transistor. your video circuit coonects the base with collector, it's wrong.

  4. This was such a to the point, concise, easy to follow and easy to understand explanation!! Thank you!

  5. sir, could you please tell me the of the software you are using in the video for making these interactive circuits.

  6. I think regular bipolar transistors should be defined as 'current multipliers'. I think it does a better job at explaining what they are doing, but perhaps that is more important for someone actually trying to make circuits with them. The current that flows through the collector to emitter is a multiple of the current flowing from the base to emitter. That multiple is called it's 'gain'. Because of this, the base on them is pretty 'low impedance' which is usually a bad thing if using them as a 'switch', and driving a heavy load. Your signal will have to be quite high on a high load, which is challenging to do from a microcontroller. I dislike looking at 'transistors' in general as a 'switch' because of this. Mosfets on the other hand…

  7. Where do I find the Symbol to utilize Logic Level Voltage to the circuit? I love your videos, but I'm stuck on this one. Help! Thanks!

  8. I find your video a little bit confusing. First of all you should separate BJT transistors and FET transistors. BJT´s are current controlled and FETs are voltage controlled. At your video you control the BJT as if it was a FET. Drawing symbol which you have used at video is a BJT(Bipolar Junction Transistor). It is also confusing to see something flowing away from collector at the first part and suddenly current goes into and through the collector at the second part of the animation.

  9. you always seem to make things a bit more confusing for beginners!!! Why do you show the voltage going through the light diode and then to the second power supply and have 23.2mV showing from the back end of the transistor to the power lead coming from the light diode then tell us the voltage flows through the LED through the transistor and back to the power supply.. even your arrow showed the path.. you diagram and your explanation show two different things.. Very very confusing.. and this is not the first time I have been confused by your explanations.. Maybe it is because I am just a beginner.. Well you will probably never see this since this was made 3 years ago..

  10. Cant we use a one power source to power both transistor and LED. ? Use one wire with a resistor to power transistor and one wire to power led or motor?

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