Відео

Will do 👍🏻

@@user-ms8kp2xc2i capacitor C2 is charged to Vcc/2 which supplies energy to the load and allows current to flow anti-clockwise and Vo is negative with respect to ground.

@@Dazzwidd Sziklai rules!!

@@theoryandapplication7197 you’re welcome 👍🏻

There's one more method, when RL=Ro then the output voltage loaded will be half of the unloaded, so Av(unloaded)/2=Av(loaded@RL=Ro) and solve for Ro. This method is simpler because it doesn't require differentiation, though you still need to take the limit of the loaded gain as RL goes to infinity to get the unloaded gain.

@@leandrocarg that’s a cool way to determine Ro. Sort of like using the Lagrangian formalism vs the Hamiltonian in a physics problem. You should put up a video explaining this technique.

@@Electronics4Guitar nice analogy. I don't make videos because my phone and PC are crap, maybe in the future. Your's are very good videos, very thorough and explicative, keep it up!

@@samwheller thank you! I hope the rest of the videos are useful to you as well. Best of luck with your studies. It’s worth the effort!

Thanks. There are a lot of videos on here by people that really understand how this stuff works but not many of them do a very good job of explaining or articulating their thoughts. I try to be precise and efficient with my explanations and work a sufficient number of example problems. 👍🏻

Thanks! Good luck with your studies. 👍🏻

Those are next on my list of topics 👍🏻

Thanks! Many more to come 👍🏻

If I get time I’ll try to think of something. No promises. I’m sure you’ll figure it out though.

@@Electronics4Guitar i tried various things, like transistor Totem Pole, to shift the voltage difference, it works, but the same problem, it would be cool if it could be done with a single timing capacitor than one on each of both rails.

Glad to have you join the audience! You’ve come to the right place, especially if you want to understand how analog circuits work. I think I’m getting better at this as I produce more content, so so keep with it 👍🏻

I’ll get to that eventually.

@@Electronics4Guitar I'm now looking at EMI / EMC filters, but they pretty much always talk about switching power supplies or targeted at that.

You might try the BF256, J111, J109 and J112 N-Channel and J175 P-Channel. They’re cheap and places like DigiKey have them. There are lots on Amazon too but I don’t know about their authenticity.

The MPF102 has an especially wide variation of parameters on paper but I rarely see any with Idss over 10 mA. Most of the newer JFETs have a narrower spread.

@@Electronics4Guitar i have quite a few breadboards, but i hate them. always these weak connections you gotta debug. i use Fallstad, than i design pcb and make it, eurorack synth modules.

@@Electronics4Guitar I have a bottle with an considerable amount of wires on my desk.

@yiwi11 I plan on doing that sometime. I want to get through diff amps and more direct coupled circuits first. It may take a while but I’ll get there.

Thank you! I try to be as precise and technically accurate as possible, without being too dry or boring. Not the easiest thing to do sometimes lol. Thanks again 👍🏻

@@Electronics4Guitar i have just received paper version of your lectures. i must say that buying books I have to be sure it will not end up on the shelf covering by dust. It took me a bit time, but yes I have it. That's going to be a good combination to read, listen and watch. I can imagine it takes a lot of time to prepare the content presented on youtube, hopefully you will not get tired 😊. Thank you!

@@robbor2204 thanks! I’m covering a lot more basic circuit theory in the videos. The publisher didn’t want the book to be over 1000 pages or I would have done that. I’ll get to all the topics in the book here, eventually 👍🏻

Thanks. Im a big fan of JFETs. I’m going to measure the Idss and Vgs(off) for a bunch of MPF102s in the next video and plot the average characteristics based on those numbers. I might do this with several different JFETs in a future video. Based on the BF256 specs, I suspect the data I compiled for the MPF102s would be nearly identical for the BF256.

@@Electronics4Guitar Would you compare vs Mosfets? i got BF256 and MMBFJ202. aswel Rohm SH8MB5 and Advanced Linear devices ALD1105 (quad), the simulator says you can build a differential amp with these, but haven't send out the PCB yet.

@@Electronics4Guitar Since we're talking about FET's, i have "designed" a automatic gain reduction in the simulator 2 days ago to protect a push pull amp exceeding the limits of the BD137/140, PSU, i wanna build, it uses FET's, it works, but did this without the math, would you like to help to make it accurate?

@@AnalogDude_ I will be covering a bit of MOSFET stuff in a few weeks or so. The ALD1105 looks like an interesting device but I haven’t used them before. I’ve got a ton of side projects going and will be pretty busy for a while so I can’t promise I help you much with your design at this time. Keep me posted on your progress.

@@Electronics4Guitar Well, i can make a video and make it only visible to you. Like i said, i have drawn up a synth modular differential amp. vca with current mirror in the sim, than i switched to mosfets in the simulator and the ALD1105 offers a quad package. it's expensive.

I agree. But I haven’t covered direct coupling in the tutorials yet. This amplifier was designed as an exercise in the analysis of capacitively coupled circuits. And it demonstrates the problems with using capacitively coupled, class-A amplifiers when large signal swings are desired. I’ll get to direct coupling soon.

Yeah, even for hydrogen the solution to the Schrödinger equation is incredibly complex. Definitely an advanced topic.

@@Electronics4Guitar The world would be better of if more people watched David Butler's video on Atoms, to get a basic understanding that reality is quite different. The space for your eyes is not empty and is chaotic.

That’s the one I built from parts. Nice, light action.

I’ll put the transistors in the feedback loop after I cover that concept in the context of op amps. And I’ll show why that isn’t necessarily the panacea that it would appear to be. There’s a method to my madness. All in good time.

@@Electronics4Guitar Ya, using transistors may add some unique sound flavor, but i wanna make something to replace my 5€ pc speakers.

I hear ya 👍🏻

I may compile all of the images into a complete file one of these days. I’ll post an update if I get to that point.

@@Electronics4Guitar You are very kind!

Thank you!

Stay tuned. I’ll get to all of them eventually 👍🏻

@@Electronics4Guitar can we use symetrical power supply for this circuit design?

@@victimovtalent6036definitely. The output stage could be operated from a bipolar supply with no modification (you could eliminate the output coupling cap). The two driver stages would need to be redesigned though and would still require capacitive coupling.

@victimovtalent6036 yes, it’s the Thevenin equivalent resistance. I should have noted this.

@@Electronics4Guitar thank you for your explanation,i'm very appreciate👍🙂

Glad it was helpful!

Thanks! 👍🏻

Glad you found the channel. I’m just getting started and hoping to generate a lot more content and hope to keep improving the presentation 👍🏻

@@Electronics4GuitarI think your presentation is really good. Heavy on the maths, which I struggle with sadly. I kinda felt like I walked into a room and was like woah, this is all way above me. What even is beta 🤷‍♂️ yeah it’s that bad. I love fixing stuff but have avoided the maths. I’ll go back to the start of your videos and work on my maths a bit I guess 😬. Great content though, thank you !

@@Mark_C1hi, Mark. Thanks for the feedback. Yeah, I definitely approach this stuff from a very technical perspective. What I envision is to eventually cover the whole field from basic RC circuits through transistors, op amps, vacuum tube amps and effects circuit operation and design. I also do plan to add a few videos that are more descriptive at some point as well. I taught EE for nearly 40 years so it’s hard to get out of that mindset. I definitely will keep the use of calculus to a bare minimum though 👍🏻 As far as transistors go, you might start with Video 12 and see if it helps with some basic concepts. I probably should have done an introduction to transistors first but I couldn’t help but jump right into it. Again, thanks for the feedback. And hopefully some of the presentations will be informative and thought provoking.

I think the bdx33/34 were low saturation voltage designed for switching only nothing linear, didn't know what that was at the time, I just used whatever I could get, most of what I made back then didn't work well!

Thank you!! I plan to keep putting out a lot more videos including tube amp design/builds. Stay tuned!!

@@Electronics4Guitar Great great news!! Thank you again