Excellent videos! Thank you sir. I can learn a lot about the design of the circuit through your videos. Do you have a video on how to select the proper heat sink for the output transistor?
Hi, thanks for your efforts and time, good video ,👍 In time 19:14 Rcs= should ÷0.2ma right and can you explain more about the re ( in 10:20 ) how to you get 26mv Thanks and have a nice day
Hi, I found a video about re' ruclips.net/video/B_8HoWoLUzQ/видео.html Thanks to RUclips and Smith for the excellent good job. Learn a lot from you all thanks. Have a nice day
Hello! Sorry for the late replay. Yes you are correct it should be 0.2mA. But the answer is correct as shown in the video for Rcs which is about 9kΩ. And thanks for sharing a good video that shows how to drive the dynamic base emitter resistance (which is the inverse of transistor's conductance gm). You are also welcome :)
Hi, I really enjoy learning to design transistor circuits, something that caught my attention in this video, you said you added some decoupling caps, to keep the board quiet. Here is the big question I have, Did you have to go through a lot of math and circuit analysis to know where to place those caps, as well as the values of each cap, OR and this is a big OR, did you place caps along the rails in places until the circuit stopped parasitic oscillations. Reason why I ask, when I get into adding more and more stages (CE config.) I find that I need to add neg feedback with miller caps, but theres no logical way I do it, I just throw caps in the circuit until the parasitics are gone. If you do, do calculations, could you please share how to know where to place caps, and what values are needed to take care of parasitics. However if its just through empiricle trial and error, please let me know so I know at least I'm on the right track. Thanks.
Sorry for the late replay! I could try to attempt to answer your question but it is better if I give you this excellent tutorial from Analog Devices that helped me understand the 'Art' (not Science; hence not a lot of calculations) involved with supply decoupling. www.analog.com/media/en/training-seminars/tutorials/MT-101.pdf?doc=cn0304.pdf All answers to your questions are present in the application note.
@@SmithKerona Thank you for the reply, Trying to understand parasitic oscillations on basic RC coupled CE stages is just trial and error for me, if my multistage is motor boating or any kind of oscillations, then I know that high amplification is close by, for me it is trial and error throwing caps into the circuit until I get the board quiet. Once the board is quiet, I get tremendous small signal gain on the output. Lately I've noticed that designing more DC coupled stages seems to eliminate the parasitics and I can achieve good small signal gain as well. The less capacitor coupling the quieter the overall circuit seems to be.
Excellent videos! Thank you sir. I can learn a lot about the design of the circuit through your videos. Do you have a video on how to select the proper heat sink for the output transistor?
Hi, thanks for your efforts and time, good video ,👍
In time 19:14 Rcs= should ÷0.2ma right
and can you explain more about the re ( in 10:20 ) how to you get 26mv
Thanks and have a nice day
Hi, I found a video about re'
ruclips.net/video/B_8HoWoLUzQ/видео.html
Thanks to RUclips and Smith for the excellent good job. Learn a lot from you all thanks.
Have a nice day
Hello! Sorry for the late replay. Yes you are correct it should be 0.2mA. But the answer is correct as shown in the video for Rcs which is about 9kΩ. And thanks for sharing a good video that shows how to drive the dynamic base emitter resistance (which is the inverse of transistor's conductance gm). You are also welcome :)
Hi, I really enjoy learning to design transistor circuits,
something that caught my attention in this video, you said you added
some decoupling caps, to keep the board quiet.
Here is the big question I have, Did you have to go through a lot of math
and circuit analysis to know where to place those caps, as well as the values
of each cap, OR and this is a big OR, did you place caps along the rails
in places until the circuit stopped parasitic oscillations.
Reason why I ask, when I get into adding more and more stages (CE config.)
I find that I need to add neg feedback with miller caps, but theres no logical
way I do it, I just throw caps in the circuit until the parasitics are gone.
If you do, do calculations, could you please share how to know where to place
caps, and what values are needed to take care of parasitics.
However if its just through empiricle trial and error, please let me know
so I know at least I'm on the right track.
Thanks.
Sorry for the late replay! I could try to attempt to answer your question but it is better if I give you this excellent tutorial from Analog Devices that helped me understand the 'Art' (not Science; hence not a lot of calculations) involved with supply decoupling. www.analog.com/media/en/training-seminars/tutorials/MT-101.pdf?doc=cn0304.pdf All answers to your questions are present in the application note.
@@SmithKerona Thank you for the reply, Trying to understand parasitic oscillations
on basic RC coupled CE stages is just trial and error for me, if my multistage
is motor boating or any kind of oscillations, then I know that high amplification is close by,
for me it is trial and error throwing caps into the circuit until I get the board quiet.
Once the board is quiet, I get tremendous small signal gain on the output.
Lately I've noticed that designing more DC coupled stages seems to eliminate the parasitics
and I can achieve good small signal gain as well. The less capacitor coupling the quieter the
overall circuit seems to be.
@@myenjoyablehobbies Are you using solderless breadboard? The parasitic elements are quite uncontrolled when it comes to solderless breadboards.