The bias circuit is the worst type of bias. With temperature changes the collector voltage will be very unstable. The best type of bias is using to resistors in the base of the transistor, which adds complications to the design.
Absolutely, totally correct!😀 This was the most basic example of a common-emitter circuit. It is intended as a *primer* on how to go about the analysis and design of transistor circuits. As I said in the video, this is fixed with the "beta-stabilized" version. The addition of an emitter resistor and a voltage divider bias. As I also said in my video, there is a video coming in which I work through this whole design. In fact, I am in the midst of creating this video, even as I type. So, stay tuned ... the best is yet to come. 🙂
WHY DID YOU USE 200 FOR BETA AND,NOT NOT 100?WHEN I DID THESE CIRCIUTS IN THE LAB IN COLLEGE WE TOOK A SOLDERING AND,TOUCHED THE TRANSISTOR WITH THE TIP AND,WATCHED THE CURRENT INCREASE IN THE BASE AND,COLLECTOR AS IT WENT INTO THERMO RUN AWAY.
The datasheet I have here tells me that the hFE can range from 100 to 300, so I picked the value in the middle. Admittedly, the wiser choice would have been 100 for the sake of thermal considerations. 🙂
This channel is one of the best I've seen regarding teaching electronics theory. Worth its weight in gold! Thank you Ralph. 73
Thank you so much! You are very welcome! 🙂
Too bad videos don't weigh very much anymore; I say at least 20x it's weight in gold!
@@milesprower6641 Thank you so much! 🙂
Brilliant! Very clear and consistent teaching throughout. Thank you so much for producing and sharing this material. Best wishes, Nick
Thank you so much, Nick! I am very glad that you found this video so helpful. You are very welcome! 🙂
Amazing! You've got to me the most under rated channel on TH-cam. Many thanks.
Thank you! I am so glad that you find my videos helpful. You are very welcome! 🙂
Simply brilliantly explained 👌, you are a very good teacher.
It's a good thing I found your channel. I will recommend you. 👍
Thank you so very much! 🙂
Love this series on transistor circuits! Thank you for your dedication!
Thanks so much! (and I love the call sign!) 🙂
Good stuff Ralph keep up the good work, and thanks for the formula sheet I'll put it to good use.
You are welcome! I am glad that the formula sheet will help. I made a copy and put it in my lab notebook myself for future reference. 🙂
I am new to your channel. This is just wonderful! Thank you so much.
I am so glad that you are finding these videos helpful! You are very welcome! 🙂
Thank you for these very educational videos mate. I really like the way you present your videos.
You are very welcome. Thank you for the encouragement! 🙂
The bias circuit is the worst type of bias. With temperature changes the collector voltage will be very unstable. The best type of bias is using to resistors in the base of the transistor, which adds complications to the design.
Absolutely, totally correct!😀
This was the most basic example of a common-emitter circuit. It is intended as a *primer* on how to go about the analysis and design of transistor circuits.
As I said in the video, this is fixed with the "beta-stabilized" version. The addition of an emitter resistor and a voltage divider bias. As I also said in my video, there is a video coming in which I work through this whole design. In fact, I am in the midst of creating this video, even as I type.
So, stay tuned ... the best is yet to come. 🙂
👍Thank you sir.
You are welcome! 🙂
Effect of measuring device (not just transistor circuits) --- why we used to use VTVMs rather than VOMs while measuring ...
Absolutely! 🙂
WHY DID YOU USE 200 FOR BETA AND,NOT NOT 100?WHEN I DID THESE CIRCIUTS IN THE LAB IN COLLEGE WE TOOK A SOLDERING AND,TOUCHED THE TRANSISTOR WITH THE TIP AND,WATCHED THE CURRENT INCREASE IN THE BASE AND,COLLECTOR AS IT WENT INTO THERMO RUN AWAY.
The datasheet I have here tells me that the hFE can range from 100 to 300, so I picked the value in the middle. Admittedly, the wiser choice would have been 100 for the sake of thermal considerations. 🙂